How to create a returning loop until a condition is met?

So, i have a large loop that is calculating values for 4 variables (JH,IJH,DIS,MXP) that all produce a matrix of (1,40). once it has looped round the entire set of values and completed all 4 matrix I want to find the means on each. How do i create a loop that continues until all the matrix are finished before starting the next step?

Answer 1

[Cris LaPierre]

This is what a while loop is for. It continues looping as long as the test condition is true.

[rafe brooks]

yeah i thought that. Ive been trying to formaulate a while statement but cant seem to crack it. Basically I am wanting to keep lopping round until the MXP vector is (1,42) but I cant find a way to write it

[Cris LaPierre]

while length(MXP)<42
    ...
end