Agree, if a plot needs to be explained, something is not very well thought of. However, there are good rationals to do it this way. Moreover, I'm using R to replace SPSS-functionality (and imaging by pvwave) within a project, and I want to be close as possible to the image output of the preceeding project. Hence, this question.
The assumption is indeed an equidistant x-axis. This is true in my case. What the stairstep-plot in R does (type="s" or type="S"), is to draw a horizontal line between two points on the x-axis. For example, x1 = 1980 x2 = 1981 x3 = 1982 y1 = 10 y2 = 12 y3 = 14 it draws a horizontal line between 1980 and 1981, at y-level 10 (or 12, depening on type="s" or type="S"). What I'm looking for, and this can be achieved in S+ by the mentioned connect type, is that the horizontal line *NOT* starts at exactly the x-values, but half between. See the attached example, where there is only one y-value of 1, at x=1995. You see the plot been drawn halfway 1995 (half before 1995, and half after 1995). This is what I'm look ing for. When using type="s" and type="S" in the plot-function, this would result in a polot that starts exactly at 1995, or ends exactly at 1995. I want to have it in between. Thanks, Maarten > -----Original Message----- > From: Uwe Ligges [mailto:[EMAIL PROTECTED] > Sent: Tuesday, February 10, 2004 10:11 AM > To: Hoeven, Maarten van der > Cc: [EMAIL PROTECTED] > Subject: Re: [R] Available in S-plus, also in R1.8.1? > > > Hoeven, Maarten van der wrote: > > > Hi, > > > > I've send this one to the list last Thursday, no reaction yet. It's > > about the Connect Type in S+. > > In order to get an answer, you might want to be more specific what > "Connect type: half horiz first" really does in S-PLUS. I don't think > something like that is available within an existing R > function (I might > be wrong here), but it can easily be coded (e.g. along the > lines of code > in package "stepfun"), given there is an *explicit > definition* (and the > cited URL is not very helpful here). > My question is: How do you define the "middle of a step", in > particular > if the interesting x values of your step-function are not equidistant? > > And another question: Why do you want to create a plot that > needs to be > explained? Other plots are much more intuitive (at least for me). > > Uwe Ligges > > > > > === > > > > Hello all, > > > > I'm looking for the R-equivalent of the S-option "Connect type: half > > horiz first". Link: > > > http://miner.stern.nyu.edu/Splus/help/guihelp/__hhelp/connect_type.htm > > > > I'm plotting with type="s" or type="S"; this is giving me a > stairstep > > starting, or ending with the value on the x-axis (as > documented). But, I > > want the x-value in the middle of the step, like "half > horiz first" in > > S-plus does. > > > > Is this possible in R? > > > > > > Thanks, > > Maarten > > -------------------------------------------------------------- > > Zie ook/see also: http://www.knmi.nl/maildisclaimer.html > > > > ______________________________________________ > > [EMAIL PROTECTED] mailing list > > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > > -------------------------------------------------------------- Zie ook/see also: http://www.knmi.nl/maildisclaimer.html
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