search for: ballaschk

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2008 Nov 06
1
nls: Fitting two models at once?
...both spectra are connected in some way: the stoichiometry of coefficients "cytf.v"/"cytb.v" is 1/2. {{In the SigmaPlot workflow one has to copy the two spectra into one column beneath each other and the two spectra are somehow treated as one curve - like in http://home.arcor.de/ballaschk/cytbf-help/sigmaplot%20formula.png}} Can anybody help? :( I tried to condense everything to the "minimum" R script below to give an impression of what I'm talking about. Martin ######################################################################## # "Minimal" R scri...
2008 Oct 25
2
help: selection of data
Hi, I'm not very experienced with R and struggle with data selection from a long matrix with two columns. I want to cut out the data between x > 0 and min(y). > x <- c(-10, -5, 0, 5, 10, 15, 20) > y <- c(10, 10, 10, -5, -6, -7, 10) > data <- as.matrix( cbind(x, y) ) > data x y [1,] -10 10 [2,] -5 10 [3,] 0 10 _ [4,] 5 -5 |-- data interval [5,] 10 -6