[R] row sum question

Dear helpers, I'm using R version 2.8.0. Suppose that I have a small data set like below. [,1] [,2] [,3] [,4] a1100 b0110 c1110 d0111 First, I'd like to find sum of each row uniquely present in each row, but only sequentially

[R] data type problem for vegan package

Dear all, I'm using R2.8 version, and am trying to do NMDS and calculate other diversity indices in vegan package. The problem is that it works with a small set of data (43 X 23; row by column), but the following error message comes up with a larger data set (43 X 104) (it seems not large to me

[R] read.table with many blanks (reposting)

Thanks Jim for pointing out how to properly ask. Here is is my question and a small subset of the data and output. I have a data set with many blanks. The blanks should be replaced with zero once imported. I tried read.table, read.csv (R 2.8 version),or scan, but none was successful. Any

[R] optim error - repost

Here is a clean version. I did this with nls and it works (see below), but I need to do it with optim. Keun-Hyung # optim vol-rep(c(0.03, 0.5, 2, 4, 8, 16, 32), 3) time-rep(c(2,4,8),each=7) p.mated-c(0.47, 0.48, 0.43, 0.43, 0.26, 0.23, NA, 0.68, 0.62, 0.64, 0.58, 0.53, 0.47, 0.24, 0.8, 0.79,

[R] optim error

I saw a similar question but I still don't fully understand how to implement optim. Can someone help me out with this? Thanks. Keun-Hyung vol-rep(c(0.03, 0.5, 2, 4, 8, 16, 32), 3) time-rep(c(2,4,8),each=7) p.mated-c(0.47, 0.48, 0.43, 0.43, 0.26, 0.23, null, 0.68, 0.62, 0.64, 0.58, 0.53, 0.47,