I have tried a lot of ways around this, but I can't find a way to make apply
work in a generalized way because it causes a failure whenever reduces the
dimensions of its output.
The following example is easier to understand than the question.
I wish it had a "drop=TRUE/FALSE" option like the "[" (and I wish I had
found the drop option a year ago, and I wish that I had 1e6 dollars... Oops,
I mean euros).
## Make three example matricies
exampGood = lapply(2:4, function(x)matrix(rnorm(1000*x),ncol=x))
exampBad = lapply(1:3, function(x)matrix(rnorm(1000*x),ncol=x))
## Two ways to see what was created:
for(k in 1:length(exampGood)) print(dim(exampGood[[k]]))
for(k in 1:length(exampBad)) print(dim(exampBad[[k]]))
## Take the cumsum of each row of each matrix
answerGood = lapply(exampGood, function(x) apply(x ,1,cumsum))
answerBad = lapply(exampBad, function(x) apply(x ,1,cumsum))
str(answerGood)
str(answerBad)
## Take the first element of the final column of each answer
for(mat in answerGood){
LastColumn = ncol(mat)
print(mat[1,LastColumn])
}
for(mat in answerBad){
LastColumn = ncol(mat)
print(mat[1,LastColumn])
}
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