Re: [R] aspect ratio 1 and blank space
Look at the squishplot function in the TeachingDemos package, it may do what you want, or if not quite then you could perhaps tweak the code to include the values you want and create the correct aspect ratio. -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare greg.s...@imail.org 801.408.8111 -Original Message- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r- project.org] On Behalf Of Silvia Cecere Sent: Wednesday, November 17, 2010 10:26 AM To: r-help@r-project.org Subject: [R] aspect ratio 1 and blank space Hi, I need to produce an ordinary scatter plot and it is vital that the aspect ratio equals 1. I set the axis as: plot(x, y, type=n, asp=1, ,ylim=c(-80,70),xlim=c(0,100)). The problem is that I get some 'additional' blank plot area (basically, the lower bound of xlim becomes quite negative). The xlim is not the range of the x-data, but I need the 0 there for further plotting. Any way to specify that even with asp=1, xlim=c(0,100)? Thanks, __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting- guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] aspect ratio 1 and blank space
On Windows R 2.12.0, the following seemed to work for me: par(pty=s) ## before plotting plot(1:10,xlim=c(0,20),ylim=c(0,30)) I do not find that setting the asp parameter does anything useful; indeed, the Help documentation seems to be backwards (asp=x/y not y/x). I probably misunderstood and/or misused it, though -- asp seems to interact with the xlim and ylim settings in inscrutable ways ... on Windows, anyway. HTH. Cheers, Bert On Wed, Nov 17, 2010 at 9:26 AM, Silvia Cecere scec...@yahoo.com wrote: Hi, I need to produce an ordinary scatter plot and it is vital that the aspect ratio equals 1. I set the axis as: plot(x, y, type=n, asp=1, ,ylim=c(-80,70),xlim=c(0,100)). The problem is that I get some 'additional' blank plot area (basically, the lower bound of xlim becomes quite negative). The xlim is not the range of the x-data, but I need the 0 there for further plotting. Any way to specify that even with asp=1, xlim=c(0,100)? Thanks, __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Bert Gunter Genentech Nonclinical Biostatistics __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] aspect ratio 1 and blank space
On 2010-11-17 09:26, Silvia Cecere wrote: Hi, I need to produce an ordinary scatter plot and it is vital that the aspect ratio equals 1. I set the axis as: plot(x, y, type=n, asp=1, ,ylim=c(-80,70),xlim=c(0,100)). The problem is that I get some 'additional' blank plot area (basically, the lower bound of xlim becomes quite negative). The xlim is not the range of the x-data, but I need the 0 there for further plotting. Any way to specify that even with asp=1, xlim=c(0,100)? It's not clear (to me, at least) what exactly you want to achieve. An aspect ratio of 1 means that you want the x-scale and the y-scale to be equal. The default plot window has dimensions height = width = 7 in, leading to a plot that's roughly square and onto which you want to place an x-scale of extent 100 units and a y-scale of extent 150 units. It's clear that equal units on both axes are going to lead to some 'extension' of the xlims. If you want to avoid that, you'll have to specify different height/width values, something like: x11(height = 7, width = 7 * (100 - 0)/(70 + 80)) and then place your plot call. You might also want to set the xaxs and/or yaxs parameters. - Peter Ehlers Thanks, __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Aspect Ratio
A couple of additional examples of when asp is important to use: The command abline(0,1) adds a line to the current plot, this line is often referred to as the 45 degree line, but the angle with the axes is only 45 degrees when asp==1, setting asp=1 will enforce this. There are multiple packages that produce maps relating to real world geography. These maps look really funny (and not related to real world geography) if they are allowed to fill the available graph space rather than enforcing an appropriate aspect ratio (usually not 1). William Cleveland did research showing that many plots are easier to interpret when the aspect ratio is set so that the average angle of the absolute value of lines of interest is 45 degrees. Compare the following 2 plots (look at how fast the sunspots increase vs. how fast they decrease): plot(sunspots, type='l') plot(sunspots, type='l', asp=1/10) Another function to look at if you don't want all the white space inside of the plot is the squishplot function in the TeachingDemos package. Hope this helps, -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare greg.s...@imail.org 801.408.8111 -Original Message- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r- project.org] On Behalf Of r.ookie Sent: Thursday, August 19, 2010 3:29 PM To: David Winsemius Cc: r-help@r-project.org Subject: Re: [R] Aspect Ratio Well, I had to look further into the documentation to see 'If asp is a finite positive value then the window is set up so that one data unit in the x direction is equal in length to asp * one data unit in the y direction' Okay, so in what situations is the 'asp' helpful? On Aug 19, 2010, at 2:24 PM, David Winsemius wrote: On Aug 19, 2010, at 5:13 PM, r.ookie wrote: set.seed(1) x - rnorm(n = 1000, mean = 0, sd = 1) plot(x = x, asp = 2000) Could someone please explain what the 'asp' parameter is doing? You want us to read the help page to you? -- David Winsemius, MD West Hartford, CT __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting- guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Aspect Ratio
On 2010-08-19 16:36, r.ookie wrote: This example definitely clarified a situation where 'asp' is useful/helpful. Thanks! Ted's last example is a bit misleading. You don't get the same result from setting xlim and ylim equal as you do from using 'asp'. Indeed, this should help you to understand aspect ratio even better. Try this: x11(width = 10, height = 5) plot(X,Y,pch=+,col=blue,xlim=c(-2.5,2.5),ylim=c(-2.5,2.5)) (using Ted's X,Y) and compare with the 'asp' version. -Peter Ehlers On Aug 19, 2010, at 3:05 PM, (Ted Harding) wrote: Spencer, you came up with your example just as I finished making mine: set.seed(54321); X- rnorm(200) ; Y- 0.25*X+0.25*rnorm(200) ##Compare: plot(X,Y,pch=+,col=blue) ##with: plot(X,Y,pch=+,col=blue,asp=1.0) With R left to choose the X and Y limits by itself, the first plot gives the superficial impression that Y increases equally as X increases -- until you look at the scales on the Y and X axes. Hence it tends to be misleading about how Y depends on X. The second plot shows their proportional relationship correctly. Of course you could achive a similar effect by explicitly setting the X and Y limits yourself: plot(X,Y,pch=+,col=blue,xlim=c(-2.5,2.5),ylim=c(-2.5,2.5)) but asp=1.0 saves you the bother of working out what they should be. There are, of course, cases where, for the sake of the desired visual effect, you would want to use an aspect ratio different from 1. The basic point is that it is a tool to help you get the vertical and horizontal dimensions of the graph in the proportions that help to achieve the visual effect you seek. Ted. On 19-Aug-10 21:50:12, Spencer Graves wrote: The documentation is not clear. It would help if it had an example like the following: plot(1:2, 1:2/10) plot(1:2, 1:2/10, asp=1) Does looking at these two plots answer the question? Spencer Graves On 8/19/2010 2:36 PM, David Winsemius wrote: On Aug 19, 2010, at 5:28 PM, r.ookie wrote: Well, I had to look further into the documentation to see 'If asp is a finite positive value then the window is set up so that one data unit in the x direction is equal in length to asp * one data unit in the y direction' Okay, so in what situations is the 'asp' helpful? It yet again appears that you are asking us to read the help pages for you. On Aug 19, 2010, at 2:24 PM, David Winsemius wrote: On Aug 19, 2010, at 5:13 PM, r.ookie wrote: set.seed(1) x- rnorm(n = 1000, mean = 0, sd = 1) plot(x = x, asp = 2000) Could someone please explain what the 'asp' parameter is doing? You want us to read the help page to you? -- David Winsemius, MD West Hartford, CT __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Spencer Graves, PE, PhD President and Chief Operating Officer Structure Inspection and Monitoring, Inc. 751 Emerson Ct. San José, CA 95126 ph: 408-655-4567 __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. E-Mail: (Ted Harding)ted.hard...@manchester.ac.uk Fax-to-email: +44 (0)870 094 0861 Date: 19-Aug-10 Time: 23:05:49 -- XFMail -- __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Aspect Ratio
Hi, From the documentation for ?plot 'asp' the y/x aspect ratio, see 'plot.window'. Here is a little demonstration of what different values would look like: # set.seed(1) x - rnorm(n = 1000, mean = 0, sd = 1) # so that four plots can be in one window for comparison par(mfcol=c(2,2)) # Make the four plots with a variety of aspect ratios plot(x = x, asp = 2000) plot(x = x, asp = 10) plot(x = x, asp = 1) plot(x = x, asp = 1/2) ## Cheers, Josh On Thu, Aug 19, 2010 at 2:13 PM, r.ookie r.oo...@live.com wrote: set.seed(1) x - rnorm(n = 1000, mean = 0, sd = 1) plot(x = x, asp = 2000) Could someone please explain what the 'asp' parameter is doing? __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Joshua Wiley Ph.D. Student, Health Psychology University of California, Los Angeles http://www.joshuawiley.com/ __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Aspect Ratio
On Aug 19, 2010, at 5:13 PM, r.ookie wrote: set.seed(1) x - rnorm(n = 1000, mean = 0, sd = 1) plot(x = x, asp = 2000) Could someone please explain what the 'asp' parameter is doing? You want us to read the help page to you? -- David Winsemius, MD West Hartford, CT __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Aspect Ratio
Well, I had to look further into the documentation to see 'If asp is a finite positive value then the window is set up so that one data unit in the x direction is equal in length to asp * one data unit in the y direction' Okay, so in what situations is the 'asp' helpful? On Aug 19, 2010, at 2:24 PM, David Winsemius wrote: On Aug 19, 2010, at 5:13 PM, r.ookie wrote: set.seed(1) x - rnorm(n = 1000, mean = 0, sd = 1) plot(x = x, asp = 2000) Could someone please explain what the 'asp' parameter is doing? You want us to read the help page to you? -- David Winsemius, MD West Hartford, CT __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Aspect Ratio
On Aug 19, 2010, at 5:28 PM, r.ookie wrote: Well, I had to look further into the documentation to see 'If asp is a finite positive value then the window is set up so that one data unit in the x direction is equal in length to asp * one data unit in the y direction' Okay, so in what situations is the 'asp' helpful? It yet again appears that you are asking us to read the help pages for you. On Aug 19, 2010, at 2:24 PM, David Winsemius wrote: On Aug 19, 2010, at 5:13 PM, r.ookie wrote: set.seed(1) x - rnorm(n = 1000, mean = 0, sd = 1) plot(x = x, asp = 2000) Could someone please explain what the 'asp' parameter is doing? You want us to read the help page to you? -- David Winsemius, MD West Hartford, CT __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Aspect Ratio
I'm asking to get people's interpretation and also whether they've encountered situations where it was useful, helpful, etc. On Aug 19, 2010, at 2:36 PM, David Winsemius wrote: On Aug 19, 2010, at 5:28 PM, r.ookie wrote: Well, I had to look further into the documentation to see 'If asp is a finite positive value then the window is set up so that one data unit in the x direction is equal in length to asp * one data unit in the y direction' Okay, so in what situations is the 'asp' helpful? It yet again appears that you are asking us to read the help pages for you. On Aug 19, 2010, at 2:24 PM, David Winsemius wrote: On Aug 19, 2010, at 5:13 PM, r.ookie wrote: set.seed(1) x - rnorm(n = 1000, mean = 0, sd = 1) plot(x = x, asp = 2000) Could someone please explain what the 'asp' parameter is doing? You want us to read the help page to you? -- David Winsemius, MD West Hartford, CT __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Aspect Ratio
The documentation is not clear. It would help if it had an example like the following: plot(1:2, 1:2/10) plot(1:2, 1:2/10, asp=1) Does looking at these two plots answer the question? Spencer Graves On 8/19/2010 2:36 PM, David Winsemius wrote: On Aug 19, 2010, at 5:28 PM, r.ookie wrote: Well, I had to look further into the documentation to see 'If asp is a finite positive value then the window is set up so that one data unit in the x direction is equal in length to asp * one data unit in the y direction' Okay, so in what situations is the 'asp' helpful? It yet again appears that you are asking us to read the help pages for you. On Aug 19, 2010, at 2:24 PM, David Winsemius wrote: On Aug 19, 2010, at 5:13 PM, r.ookie wrote: set.seed(1) x - rnorm(n = 1000, mean = 0, sd = 1) plot(x = x, asp = 2000) Could someone please explain what the 'asp' parameter is doing? You want us to read the help page to you? -- David Winsemius, MD West Hartford, CT __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Spencer Graves, PE, PhD President and Chief Operating Officer Structure Inspection and Monitoring, Inc. 751 Emerson Ct. San José, CA 95126 ph: 408-655-4567 __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Aspect Ratio
On Thu, Aug 19, 2010 at 2:46 PM, r.ookie r.oo...@live.com wrote: I'm asking to get people's interpretation and also whether they've encountered situations where it was useful, helpful, etc. In general, it would probably help your responses on this list if you were clearer in the first place then. For instance, In the documentation I read that 'asp' is _, but I have tried x and y I do not understand when it would be helpful to set 'asp' to values other than the default. Imagine you have two variables, X and Y. X has a very small range (lets say a probability of having an accident) and Y has a huge range (number of kilometers driven in a year). Setting different aspect ratios, may make it easier to see the data. What follows are some examples. The y axis data is the same in all four, but I there are two sets of data for the x axis. You can see how setting different aspect ratios makes the relationship between X and Y more or less clear. x1 - seq(from = 0, to = .1, by = .01) x2 - seq(from = 0, to = 1000, by = 100) y - 0:10 # so that four plots can be in one window for comparison par(mfcol=c(2,2)) # Make the four plots with a variety of aspect ratios plot(x = x1, y = y, asp = 1/1, main = expression(paste(frac(y, x) == frac(1, 1 plot(x = x1, y = y, asp = 1/100, main = expression(paste(frac(y, x) == frac(1, 100 plot(x = x2, y = y, asp = 1/1, main = expression(paste(frac(y, x) == frac(1, 1 plot(x = x2, y = y, asp = 100/1, main = expression(paste(frac(y, x) == frac(100, 1 ### On Aug 19, 2010, at 2:36 PM, David Winsemius wrote: On Aug 19, 2010, at 5:28 PM, r.ookie wrote: Well, I had to look further into the documentation to see 'If asp is a finite positive value then the window is set up so that one data unit in the x direction is equal in length to asp * one data unit in the y direction' Okay, so in what situations is the 'asp' helpful? It yet again appears that you are asking us to read the help pages for you. On Aug 19, 2010, at 2:24 PM, David Winsemius wrote: On Aug 19, 2010, at 5:13 PM, r.ookie wrote: set.seed(1) x - rnorm(n = 1000, mean = 0, sd = 1) plot(x = x, asp = 2000) Could someone please explain what the 'asp' parameter is doing? You want us to read the help page to you? -- David Winsemius, MD West Hartford, CT __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Joshua Wiley Ph.D. Student, Health Psychology University of California, Los Angeles http://www.joshuawiley.com/ __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Aspect Ratio
Spencer, you came up with your example just as I finished making mine: set.seed(54321); X - rnorm(200) ; Y - 0.25*X+0.25*rnorm(200) ##Compare: plot(X,Y,pch=+,col=blue) ##with: plot(X,Y,pch=+,col=blue,asp=1.0) With R left to choose the X and Y limits by itself, the first plot gives the superficial impression that Y increases equally as X increases -- until you look at the scales on the Y and X axes. Hence it tends to be misleading about how Y depends on X. The second plot shows their proportional relationship correctly. Of course you could achive a similar effect by explicitly setting the X and Y limits yourself: plot(X,Y,pch=+,col=blue,xlim=c(-2.5,2.5),ylim=c(-2.5,2.5)) but asp=1.0 saves you the bother of working out what they should be. There are, of course, cases where, for the sake of the desired visual effect, you would want to use an aspect ratio different from 1. The basic point is that it is a tool to help you get the vertical and horizontal dimensions of the graph in the proportions that help to achieve the visual effect you seek. Ted. On 19-Aug-10 21:50:12, Spencer Graves wrote: The documentation is not clear. It would help if it had an example like the following: plot(1:2, 1:2/10) plot(1:2, 1:2/10, asp=1) Does looking at these two plots answer the question? Spencer Graves On 8/19/2010 2:36 PM, David Winsemius wrote: On Aug 19, 2010, at 5:28 PM, r.ookie wrote: Well, I had to look further into the documentation to see 'If asp is a finite positive value then the window is set up so that one data unit in the x direction is equal in length to asp * one data unit in the y direction' Okay, so in what situations is the 'asp' helpful? It yet again appears that you are asking us to read the help pages for you. On Aug 19, 2010, at 2:24 PM, David Winsemius wrote: On Aug 19, 2010, at 5:13 PM, r.ookie wrote: set.seed(1) x - rnorm(n = 1000, mean = 0, sd = 1) plot(x = x, asp = 2000) Could someone please explain what the 'asp' parameter is doing? You want us to read the help page to you? -- David Winsemius, MD West Hartford, CT __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Spencer Graves, PE, PhD President and Chief Operating Officer Structure Inspection and Monitoring, Inc. 751 Emerson Ct. San José, CA 95126 ph: 408-655-4567 __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. E-Mail: (Ted Harding) ted.hard...@manchester.ac.uk Fax-to-email: +44 (0)870 094 0861 Date: 19-Aug-10 Time: 23:05:49 -- XFMail -- __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Aspect Ratio
plot(1:3) # usual way to view plot(1:3, asp = 2) # convenient way to apply horizontal compression for visibility plot(1:3, xlim = c(0, 4)) # but if you have information on what the graph looks like, you can manually apply the same horizontal compression Was I going through some sort of gang initiation because I'm new, and didn't know it? Phew, I'm glad it's over. Thanks for the help Spencer. On Aug 19, 2010, at 2:50 PM, Spencer Graves wrote: The documentation is not clear. It would help if it had an example like the following: plot(1:2, 1:2/10) plot(1:2, 1:2/10, asp=1) Does looking at these two plots answer the question? Spencer Graves On 8/19/2010 2:36 PM, David Winsemius wrote: On Aug 19, 2010, at 5:28 PM, r.ookie wrote: Well, I had to look further into the documentation to see 'If asp is a finite positive value then the window is set up so that one data unit in the x direction is equal in length to asp * one data unit in the y direction' Okay, so in what situations is the 'asp' helpful? It yet again appears that you are asking us to read the help pages for you. On Aug 19, 2010, at 2:24 PM, David Winsemius wrote: On Aug 19, 2010, at 5:13 PM, r.ookie wrote: set.seed(1) x - rnorm(n = 1000, mean = 0, sd = 1) plot(x = x, asp = 2000) Could someone please explain what the 'asp' parameter is doing? You want us to read the help page to you? -- David Winsemius, MD West Hartford, CT __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Spencer Graves, PE, PhD President and Chief Operating Officer Structure Inspection and Monitoring, Inc. 751 Emerson Ct. San José, CA 95126 ph: 408-655-4567 __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Aspect Ratio
I understand Joshua, it's a way to display the plotted data in a graph. I've been using 'ylim = c()' and 'xlim = c()' so far but it's nice to be aware of 'asp' too. On Aug 19, 2010, at 2:58 PM, Joshua Wiley wrote: On Thu, Aug 19, 2010 at 2:46 PM, r.ookie r.oo...@live.com wrote: I'm asking to get people's interpretation and also whether they've encountered situations where it was useful, helpful, etc. In general, it would probably help your responses on this list if you were clearer in the first place then. For instance, In the documentation I read that 'asp' is _, but I have tried x and y I do not understand when it would be helpful to set 'asp' to values other than the default. Imagine you have two variables, X and Y. X has a very small range (lets say a probability of having an accident) and Y has a huge range (number of kilometers driven in a year). Setting different aspect ratios, may make it easier to see the data. What follows are some examples. The y axis data is the same in all four, but I there are two sets of data for the x axis. You can see how setting different aspect ratios makes the relationship between X and Y more or less clear. x1 - seq(from = 0, to = .1, by = .01) x2 - seq(from = 0, to = 1000, by = 100) y - 0:10 # so that four plots can be in one window for comparison par(mfcol=c(2,2)) # Make the four plots with a variety of aspect ratios plot(x = x1, y = y, asp = 1/1, main = expression(paste(frac(y, x) == frac(1, 1 plot(x = x1, y = y, asp = 1/100, main = expression(paste(frac(y, x) == frac(1, 100 plot(x = x2, y = y, asp = 1/1, main = expression(paste(frac(y, x) == frac(1, 1 plot(x = x2, y = y, asp = 100/1, main = expression(paste(frac(y, x) == frac(100, 1 ### On Aug 19, 2010, at 2:36 PM, David Winsemius wrote: On Aug 19, 2010, at 5:28 PM, r.ookie wrote: Well, I had to look further into the documentation to see 'If asp is a finite positive value then the window is set up so that one data unit in the x direction is equal in length to asp * one data unit in the y direction' Okay, so in what situations is the 'asp' helpful? It yet again appears that you are asking us to read the help pages for you. On Aug 19, 2010, at 2:24 PM, David Winsemius wrote: On Aug 19, 2010, at 5:13 PM, r.ookie wrote: set.seed(1) x - rnorm(n = 1000, mean = 0, sd = 1) plot(x = x, asp = 2000) Could someone please explain what the 'asp' parameter is doing? You want us to read the help page to you? -- David Winsemius, MD West Hartford, CT __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Joshua Wiley Ph.D. Student, Health Psychology University of California, Los Angeles http://www.joshuawiley.com/ __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Aspect Ratio
On Thu, 2010-08-19 at 14:28 -0700, r.ookie wrote: Well, I had to look further into the documentation to see 'If asp is a finite positive value then the window is set up so that one data unit in the x direction is equal in length to asp * one data unit in the y direction' Okay, so in what situations is the 'asp' helpful? If 'x' and 'y' are in the same units but one covers a larger/smaller range than the other, asp will make the axes be scaled in the same units such that the distance along the 'y' axis for 1 unit change is the same as the distance along the 'x' axis for a 1 unit change. dat - data.frame(x = seq(1, 100, length = 100), y = seq(1, 10, length = 100)) layout(matrix(1:2, ncol = 2)) plot(y ~ x, data = dat) plot(y ~ x, data = dat, asp = 1, main = expression(asp == 1)) layout(1) If x and y are both in say metres the second plot respects the natural scale whereas the first doesn't. G On Aug 19, 2010, at 2:24 PM, David Winsemius wrote: On Aug 19, 2010, at 5:13 PM, r.ookie wrote: set.seed(1) x - rnorm(n = 1000, mean = 0, sd = 1) plot(x = x, asp = 2000) Could someone please explain what the 'asp' parameter is doing? You want us to read the help page to you? -- %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% Dr. Gavin Simpson [t] +44 (0)20 7679 0522 ECRC, UCL Geography, [f] +44 (0)20 7679 0565 Pearson Building, [e] gavin.simpsonATNOSPAMucl.ac.uk Gower Street, London [w] http://www.ucl.ac.uk/~ucfagls/ UK. WC1E 6BT. [w] http://www.freshwaters.org.uk %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Aspect Ratio
This example definitely clarified a situation where 'asp' is useful/helpful. Thanks! On Aug 19, 2010, at 3:05 PM, (Ted Harding) wrote: Spencer, you came up with your example just as I finished making mine: set.seed(54321); X - rnorm(200) ; Y - 0.25*X+0.25*rnorm(200) ##Compare: plot(X,Y,pch=+,col=blue) ##with: plot(X,Y,pch=+,col=blue,asp=1.0) With R left to choose the X and Y limits by itself, the first plot gives the superficial impression that Y increases equally as X increases -- until you look at the scales on the Y and X axes. Hence it tends to be misleading about how Y depends on X. The second plot shows their proportional relationship correctly. Of course you could achive a similar effect by explicitly setting the X and Y limits yourself: plot(X,Y,pch=+,col=blue,xlim=c(-2.5,2.5),ylim=c(-2.5,2.5)) but asp=1.0 saves you the bother of working out what they should be. There are, of course, cases where, for the sake of the desired visual effect, you would want to use an aspect ratio different from 1. The basic point is that it is a tool to help you get the vertical and horizontal dimensions of the graph in the proportions that help to achieve the visual effect you seek. Ted. On 19-Aug-10 21:50:12, Spencer Graves wrote: The documentation is not clear. It would help if it had an example like the following: plot(1:2, 1:2/10) plot(1:2, 1:2/10, asp=1) Does looking at these two plots answer the question? Spencer Graves On 8/19/2010 2:36 PM, David Winsemius wrote: On Aug 19, 2010, at 5:28 PM, r.ookie wrote: Well, I had to look further into the documentation to see 'If asp is a finite positive value then the window is set up so that one data unit in the x direction is equal in length to asp * one data unit in the y direction' Okay, so in what situations is the 'asp' helpful? It yet again appears that you are asking us to read the help pages for you. On Aug 19, 2010, at 2:24 PM, David Winsemius wrote: On Aug 19, 2010, at 5:13 PM, r.ookie wrote: set.seed(1) x - rnorm(n = 1000, mean = 0, sd = 1) plot(x = x, asp = 2000) Could someone please explain what the 'asp' parameter is doing? You want us to read the help page to you? -- David Winsemius, MD West Hartford, CT __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Spencer Graves, PE, PhD President and Chief Operating Officer Structure Inspection and Monitoring, Inc. 751 Emerson Ct. San José, CA 95126 ph: 408-655-4567 __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. E-Mail: (Ted Harding) ted.hard...@manchester.ac.uk Fax-to-email: +44 (0)870 094 0861 Date: 19-Aug-10 Time: 23:05:49 -- XFMail -- __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Aspect Ratio
Thanks for your example as well. Ted's example was exactly what I needed. On Aug 19, 2010, at 3:18 PM, Gavin Simpson wrote: On Thu, 2010-08-19 at 14:28 -0700, r.ookie wrote: Well, I had to look further into the documentation to see 'If asp is a finite positive value then the window is set up so that one data unit in the x direction is equal in length to asp * one data unit in the y direction' Okay, so in what situations is the 'asp' helpful? If 'x' and 'y' are in the same units but one covers a larger/smaller range than the other, asp will make the axes be scaled in the same units such that the distance along the 'y' axis for 1 unit change is the same as the distance along the 'x' axis for a 1 unit change. dat - data.frame(x = seq(1, 100, length = 100), y = seq(1, 10, length = 100)) layout(matrix(1:2, ncol = 2)) plot(y ~ x, data = dat) plot(y ~ x, data = dat, asp = 1, main = expression(asp == 1)) layout(1) If x and y are both in say metres the second plot respects the natural scale whereas the first doesn't. G On Aug 19, 2010, at 2:24 PM, David Winsemius wrote: On Aug 19, 2010, at 5:13 PM, r.ookie wrote: set.seed(1) x - rnorm(n = 1000, mean = 0, sd = 1) plot(x = x, asp = 2000) Could someone please explain what the 'asp' parameter is doing? You want us to read the help page to you? -- %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% Dr. Gavin Simpson [t] +44 (0)20 7679 0522 ECRC, UCL Geography, [f] +44 (0)20 7679 0565 Pearson Building, [e] gavin.simpsonATNOSPAMucl.ac.uk Gower Street, London [w] http://www.ucl.ac.uk/~ucfagls/ UK. WC1E 6BT. [w] http://www.freshwaters.org.uk %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Aspect Ratio
The 'fortunes' package contains the following:
library(fortunes)
fortune('rtfm')
This is all documented in TFM. Those who WTFM don't want to have to WTFM
again
on the mailing list. RTFM.
-- Barry Rowlingson
R-help (October 2003)
I see two problems with this:
1. It's difficult to RTFM if one does not know which FMTR.
2. No piece of prose in any language is ever perfectly
clear, complete and concise to all readers. In learning mathematics, it
is common to spend hours on one page. I once heard of a famous
professor in the middle of a lecture start to say, It is intuitively
obvious. The he paused for 15 minutes before repeating, Yes, it is
intuitively obvious that ... . One of the enormous advantages of the R
package system is that anything not obvious to a particular reader can
be traced line by line in any number of different examples until
sufficient enlightenment is achieved.
Best Wishes,
Spencer Graves
On 8/19/2010 3:38 PM, r.ookie wrote:
Thanks for your example as well. Ted's example was exactly what I needed.
On Aug 19, 2010, at 3:18 PM, Gavin Simpson wrote:
On Thu, 2010-08-19 at 14:28 -0700, r.ookie wrote:
Well, I had to look further into the documentation to see 'If asp is a
finite positive value then the window is set up so that one data unit
in the x direction is equal in length to asp * one data unit in the y
direction'
Okay, so in what situations is the 'asp' helpful?
If 'x' and 'y' are in the same units but one covers a larger/smaller
range than the other, asp will make the axes be scaled in the same units
such that the distance along the 'y' axis for 1 unit change is the same
as the distance along the 'x' axis for a 1 unit change.
dat- data.frame(x = seq(1, 100, length = 100),
y = seq(1, 10, length = 100))
layout(matrix(1:2, ncol = 2))
plot(y ~ x, data = dat)
plot(y ~ x, data = dat, asp = 1, main = expression(asp == 1))
layout(1)
If x and y are both in say metres the second plot respects the natural
scale whereas the first doesn't.
G
On Aug 19, 2010, at 2:24 PM, David Winsemius wrote:
On Aug 19, 2010, at 5:13 PM, r.ookie wrote:
set.seed(1)
x- rnorm(n = 1000, mean = 0, sd = 1)
plot(x = x, asp = 2000)
Could someone please explain what the 'asp' parameter is doing?
You want us to read the help page to you?
--
Spencer Graves, PE, PhD
President and Chief Operating Officer
Structure Inspection and Monitoring, Inc.
751 Emerson Ct.
San José, CA 95126
ph: 408-655-4567
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] Aspect Ratio
Well-stated.
On Aug 19, 2010, at 4:31 PM, Spencer Graves wrote:
The 'fortunes' package contains the following:
library(fortunes)
fortune('rtfm')
This is all documented in TFM. Those who WTFM don't want to have to WTFM again
on the mailing list. RTFM.
-- Barry Rowlingson
R-help (October 2003)
I see two problems with this:
1. It's difficult to RTFM if one does not know which FMTR.
2. No piece of prose in any language is ever perfectly clear,
complete and concise to all readers. In learning mathematics, it is common to
spend hours on one page. I once heard of a famous professor in the middle of a
lecture start to say, It is intuitively obvious. The he paused for 15
minutes before repeating, Yes, it is intuitively obvious that ... . One of
the enormous advantages of the R package system is that anything not obvious to
a particular reader can be traced line by line in any number of different
examples until sufficient enlightenment is achieved.
Best Wishes,
Spencer Graves
On 8/19/2010 3:38 PM, r.ookie wrote:
Thanks for your example as well. Ted's example was exactly what I needed.
On Aug 19, 2010, at 3:18 PM, Gavin Simpson wrote:
On Thu, 2010-08-19 at 14:28 -0700, r.ookie wrote:
Well, I had to look further into the documentation to see 'If asp is a
finite positive value then the window is set up so that one data unit
in the x direction is equal in length to asp * one data unit in the y
direction'
Okay, so in what situations is the 'asp' helpful?
If 'x' and 'y' are in the same units but one covers a larger/smaller
range than the other, asp will make the axes be scaled in the same units
such that the distance along the 'y' axis for 1 unit change is the same
as the distance along the 'x' axis for a 1 unit change.
dat- data.frame(x = seq(1, 100, length = 100),
y = seq(1, 10, length = 100))
layout(matrix(1:2, ncol = 2))
plot(y ~ x, data = dat)
plot(y ~ x, data = dat, asp = 1, main = expression(asp == 1))
layout(1)
If x and y are both in say metres the second plot respects the natural
scale whereas the first doesn't.
G
On Aug 19, 2010, at 2:24 PM, David Winsemius wrote:
On Aug 19, 2010, at 5:13 PM, r.ookie wrote:
set.seed(1)
x- rnorm(n = 1000, mean = 0, sd = 1)
plot(x = x, asp = 2000)
Could someone please explain what the 'asp' parameter is doing?
You want us to read the help page to you?
--
Spencer Graves, PE, PhD
President and Chief Operating Officer
Structure Inspection and Monitoring, Inc.
751 Emerson Ct.
San José, CA 95126
ph: 408-655-4567
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
