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 190 3
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.
