Loop in R: how to save the outputs?

Question

I am trying to save the data from a loop of logical tests.

So I have the following data:

T1 <- matrix(seq(from=100000, to=6600000,length.out=676),         


        

Answer 1

Another way to do what joran suggests is to use the apply family of functions.

result2 <- lapply(F, function(f) {T1 > f})

This gives the same thing as joran's result, a list where each element corresponds to one of the values of F and that element is a 26x26 logical matrix.

Another alternative is to store the results as a three dimensional logical matrix (49*26*26) where each slice corresponds to one of the values of F.

result3 <- sapply(F, function(f) {T1 > f}, simplify="array")

the structure of which is

> str(result3)
 logi [1:26, 1:26, 1:49] FALSE FALSE FALSE FALSE TRUE TRUE ...

Answer 2

Store each boolean matrix as an item in a list:

result <- vector("list",49)
for (i in 1:49)
{
   result[[i]] <- T1>F[i] # I used print to see the results in the screen
}

#Print the first matrix on screen
result[[1]]