search for: 1000x3

Hello, I am having trouble creating a (1000,3,201) array in R from a data set created within the same script. My problem is that I want to take a matrix that is 1000x603 (called "landmat") and separate this into 201 separate (1000x3) matrices. My problem is when I try to do particular combinations of the columns. I want to take the first 3 columns of "landmat" and create the first 1000x3 matrix, then I want to take columns 4,5,6 of "landmat" and create the second matrix, then continue this process until a...

...call a patch processing & procedure script >> it retrieves 4 lists of info (each around 400x100) from an index data.frame, and then it calls another script to retrieve info from the corresponding data.frames on the 4 lists in the global space >> through calling another script, about 1000x3 will be retrieved by another script >> the 1000x3 will be passed to a third script expanded to 20001x3, and only 20001x1 will be used >> 20001x1 will accumulate into a matrix of up to 20001x1500 (number of data frames / trials), say I have to divide the trials into 2 groups and do a com...

I've continued to work on speeding up R, and now have a collection of fourteen patches, some of which speed up particular functions, and some of which reduce general interpretive overhead. The total speed improvement from these patches is substantial. It varies a lot from one R program to the next, of course, and probably from one machine to the next, but speedups of 25% can be expected in

Hello, I have a simple (?) simulation problem. I'm doing a simulation with logistic model and I want to reapet it 600 times. The simulation looks like this: z <- 0 x <- 0 y <- 0 aps <- 0 tiss <- 0 for (i in 1:500){ z[i] <- rbinom(1, 1, .6) x[i] <- rbinom(1, 1, .95) y[i] <- z[i]*x[i] if (y[i]==1) aps[i] <- rnorm(1,mean=13.4, sd=7.09) else aps[i] <-