Re: [R] Is there in R a function equivalent to the mround, as found in most spreadsheets?
Hello Luca. Dr. Ottorino-Luca Pantani wrote: ... c(1803.02, 193.51, 3.47) Each solution is to be taken with 3 different pipettes (5000, 250 and 10 µL Volume max) and each of those delivers volumes in steps of 50 µL, 5 µL or 1µL, respectively Since the above values would eventually become c(1800, 195, 3) ... You find a complete solution at http://albertosantini.blogspot.com/2008/05/mround.html It checks the sign of the number and the multiple and it hacks the issue of rounding off a 5 respect IEC 60559 standard. The test cases are: mround(10, 3) # 9 mround(-10, -3) # -9 mround(1.3, 0.2) # 1.4 mround(5, -2) # error mround(1.7, 0.2) # 1.8 mround(321.123, 0.12) # 321.12 mround(1803.02, 50) # 1800 mround(193.51, 5) # 195 mround(3.47, 1) # 3 Regards, Alberto -- View this message in context: http://www.nabble.com/Is-there-in-R-a-function-equivalent-to-the-mround%2C-as-found-in-most-spreadsheets--tp17143519p17170296.html Sent from the R help mailing list archive at Nabble.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.
[R] Is there in R a function equivalent to the mround, as found in most spreadsheets?
Dear R-users, I have the following problem In a lab experiment I have to mix three solutions to get different concentrations of various molecules in a cuvette I've used R to calculate the necessary µliters for each of the level of the experiment and I must confess that it is more useful and easier to achieve the results than using spreadsheets. But there's a problem. Imagine that for a particular cuvette (I have 112 different cuvettes !!) you have to mix the following volumes of solution A, B, and C respectively. c(1803.02, 193.51, 3.47) Each solution is to be taken with 3 different pipettes (5000, 250 and 10 µL Volume max) and each of those delivers volumes in steps of 50 µL, 5 µL or 1µL, respectively Since the above values would eventually become c(1800, 195, 3) it is then necessary to recalculate all the final concentrations of A, B and C, because the volumes are changed. I know that in most spreadsheets (Calc, Gnumeric, Excel and so on) there's a function such as mround(num; num) that give the results I need, but I want to learn more on R functions. I played a little with R functions such as round, signif, ceiling, trunc, and floor but without success. Any hint to solve this problem ? Thanks a lot http://www.openofficetips.com/blog/archives/2005/04/rounding_to_the.html http://www.gnome.org/projects/gnumeric/doc/gnumeric-MROUND.shtml -- Ottorino-Luca Pantani, Università di Firenze Dip. Scienza del Suolo e Nutrizione della Pianta P.zle Cascine 28 50144 Firenze Italia Tel 39 055 3288 202 (348 lab) Fax 39 055 333 273 [EMAIL PROTECTED] http://www4.unifi.it/dssnp/ __ 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] Is there in R a function equivalent to the mround, as found in most spreadsheets?
Dr. Ottorino-Luca Pantani ottorino-luca.pantani at unifi.it writes: In a lab experiment I have to mix three solutions to get different concentrations of various molecules in a cuvette I've used R to calculate the necessary µliters for each of the level of the experiment and I must confess that it is more useful and easier to achieve the results than using spreadsheets. But there's a problem. Imagine that for a particular cuvette (I have 112 different cuvettes !!) you have to mix the following volumes of solution A, B, and C respectively. c(1803.02, 193.51, 3.47) Each solution is to be taken with 3 different pipettes (5000, 250 and 10 µL Volume max) and each of those delivers volumes in steps of 50 µL, 5 µL or 1µL, respectively Since the above values would eventually become c(1800, 195, 3) it is then necessary to recalculate all the final concentrations of A, B and C, because the volumes are changed. A first guess would be a = c(1803.02, 193.51, 3.47) round(a / 5)*5 which gives 1805 1955 This is not exactly what you want, but it shows that the problem is a bit ill-defined. In the example you gave, why do you want 1800, and not 1805, which is possible with the pipettes? I assume that you laboratory experience is working in the background, telling you to stop pipetmanning when you are close to the result in some percentage feeling. Dieter __ 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] Is there in R a function equivalent to the mround, as found in most spreadsheets?
On May 9, 2008, at 5:39 AM, Dieter Menne wrote: Dr. Ottorino-Luca Pantani ottorino-luca.pantani at unifi.it writes: Imagine that for a particular cuvette (I have 112 different cuvettes !!) you have to mix the following volumes of solution A, B, and C respectively. c(1803.02, 193.51, 3.47) Each solution is to be taken with 3 different pipettes (5000, 250 and 10 µL Volume max) and each of those delivers volumes in steps of 50 µL, 5 µL or 1µL, respectively Since the above values would eventually become c(1800, 195, 3) it is then necessary to recalculate all the final concentrations of A, B and C, because the volumes are changed. A first guess would be a = c(1803.02, 193.51, 3.47) round(a / 5)*5 which gives 1805 1955 If I understand the OP's question properly, the first value is to be a multiple of 50, the second a multiple of 5, and the third a multiple of 1. This can be done with this slight variation on the above theme: a - c(1803.02, 193.51, 3.47) b - c(50,5,1) round(a/b) *b This is not exactly what you want, but it shows that the problem is a bit ill-defined. In the example you gave, why do you want 1800, and not 1805, which is possible with the pipettes? I assume that you laboratory experience is working in the background, telling you to stop pipetmanning when you are close to the result in some percentage feeling. Dieter Haris Skiadas Department of Mathematics and Computer Science Hanover College __ 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] Is there in R a function equivalent to the mround, as found in most spreadsheets?
Charilaos Skiadas ha scritto: On May 9, 2008, at 5:39 AM, Dieter Menne wrote: If I understand the OP's question properly, the first value is to be a multiple of 50, the second a multiple of 5, and the third a multiple of 1. This can be done with this slight variation on the above theme: a - c(1803.02, 193.51, 3.47) b - c(50,5,1) round(a/b) *b This is exactly was I was looking for, and you understand it properly. Sorry for the double post, but I'm experiencing problems with my account in this list This is not exactly what you want, but it shows that the problem is a bit ill-defined. In the example you gave, why do you want 1800, and not 1805, which is possible with the pipettes? I assume that you laboratory experience is working in the background, telling you to stop pipetmanning when you are close to the result in some percentage feeling. Dieter No, even if there's a lab background working behind, I'm only transferring some experience with spreadsheets to R. I want (actually the pipette wants) 1800 instead that 1805 since the larger volumes are to be delivered with a digital pipette whose step is 50. Thanks to all the people who contributed. This list is always a great source. 8rino __ 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] Is there in R a function equivalent to the mround, as found in most spreadsheets?
Dear R-users, I have the following problem In a lab experiment I have to mix three solutions to get different concentrations of various molecules in a cuvette I've used R to calculate the necessary µliters for each of the level of the experiment and I must confess that it is more useful and easier to achieve the results than using spreadsheets. But there's a problem. Imagine that for a particular cuvette (I have 112 different cuvettes !!) you have to mix the following volumes of solution A, B, and C respectively. c(1803.02, 193.51, 3.47) Each solution is to be taken with 3 different pipettes (5000, 250 and 10 µL Volume max) and each of those delivers volumes in steps of 50 µL, 5 µL or 1µL, respectively Since the above values would eventually become c(1800, 195, 3) it is then necessary to recalculate all the final concentrations of A, B and C, because the volumes are changed. I know that in most spreadsheets (Calc in Open Office, Gnumeric, Excel and so on) there's a function such as mround(num; num) that give the results I need, but I want to learn more on R functions. I played a little with R functions such as round, signif, ceiling, trunc, and floor but without success. Any hint to solve this problem ? Thanks a lot http://www.openofficetips.com/blog/archives/2005/04/rounding_to_the.html http://www.gnome.org/projects/gnumeric/doc/gnumeric-MROUND.shtml -- Ottorino-Luca Pantani, Università di Firenze Dip. Scienza del Suolo e Nutrizione della Pianta P.zle Cascine 28 50144 Firenze Italia Tel 39 055 3288 202 (348 lab) Fax 39 055 333 273 [EMAIL PROTECTED] http://www4.unifi.it/dssnp/ __ 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] Is there in R a function equivalent to the mround, as found in most spreadsheets?
On 5/6/2008 12:07 PM, Dr. Ottorino-Luca Pantani wrote: Dear R-users, I have the following problem In a lab experiment I have to mix three solutions to get different concentrations of various molecules in a cuvette I've used R to calculate the necessary µliters for each of the level of the experiment and I must confess that it is more useful and easier to achieve the results than using spreadsheets. But there's a problem. Imagine that for a particular cuvette (I have 112 different cuvettes !!) you have to mix the following volumes of solution A, B, and C respectively. c(1803.02, 193.51, 3.47) Each solution is to be taken with 3 different pipettes (5000, 250 and 10 µL Volume max) and each of those delivers volumes in steps of 50 µL, 5 µL or 1µL, respectively Since the above values would eventually become c(1800, 195, 3) it is then necessary to recalculate all the final concentrations of A, B and C, because the volumes are changed. I know that in most spreadsheets (Calc in Open Office, Gnumeric, Excel and so on) there's a function such as mround(num; num) that give the results I need, but I want to learn more on R functions. I played a little with R functions such as round, signif, ceiling, trunc, and floor but without success. Any hint to solve this problem ? I believe this function matches the description in OOO: mround - function(number, multiple) multiple * round(number/multiple) Duncan Murdoch __ 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] Is there in R a function equivalent to the mround, as found in most spreadsheets?
Hi Ottorino, You could just use the modulus operator %% as follows: x-c(1803.02, 193.51, 3.47); x-x%%c(50,5,1) #just using the modulus operator [1] 1800 1903 thanks Dr. Ottorino-Luca Pantani wrote: Dear R-users, I have the following problem In a lab experiment I have to mix three solutions to get different concentrations of various molecules in a cuvette I've used R to calculate the necessary µliters for each of the level of the experiment and I must confess that it is more useful and easier to achieve the results than using spreadsheets. But there's a problem. Imagine that for a particular cuvette (I have 112 different cuvettes !!) you have to mix the following volumes of solution A, B, and C respectively. c(1803.02, 193.51, 3.47) Each solution is to be taken with 3 different pipettes (5000, 250 and 10 µL Volume max) and each of those delivers volumes in steps of 50 µL, 5 µL or 1µL, respectively Since the above values would eventually become c(1800, 195, 3) it is then necessary to recalculate all the final concentrations of A, B and C, because the volumes are changed. I know that in most spreadsheets (Calc in Open Office, Gnumeric, Excel and so on) there's a function such as mround(num; num) that give the results I need, but I want to learn more on R functions. I played a little with R functions such as round, signif, ceiling, trunc, and floor but without success. Any hint to solve this problem ? Thanks a lot http://www.openofficetips.com/blog/archives/2005/04/rounding_to_the.html http://www.gnome.org/projects/gnumeric/doc/gnumeric-MROUND.shtml -- Ottorino-Luca Pantani, Università di Firenze Dip. Scienza del Suolo e Nutrizione della Pianta P.zle Cascine 28 50144 Firenze Italia Tel 39 055 3288 202 (348 lab) Fax 39 055 333 273 [EMAIL PROTECTED] http://www4.unifi.it/dssnp/ __ 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. - Yasir H. Kaheil, Ph.D. Catchment Research Facility The University of Western Ontario -- View this message in context: http://www.nabble.com/Is-there-in-R-a-function-equivalent-to-the-mround%2C-as-found-in-most-spreadsheets--tp17086856p17087399.html Sent from the R help mailing list archive at Nabble.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] Is there in R a function equivalent to the mround, as found in most spreadsheets?
I believe this function matches the description in OOO:
mround - function(number, multiple) multiple * round(number/multiple)
I've implemented a slightly more general form in the reshape package:
round_any - function (x, accuracy, f = round) {
f(x/accuracy) * accuracy
}
Hadley
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