For Loop runs too many times
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Hi everyone.. I'm new to matlab and am trying to populate a 3D array by the results of a loop:
And I am getting different 2x3 C matrices where j=1, 2, then j=1,2,3 then j=1,2,3,4. Is there a way I can run the loop just for j=1, then j=2, thenj=3 and j=4? I thought I should be getting a 3D array containing just 4 "pages" (i-e, 4 matrices??
Matt Fig on 9 Dec 2012
Edited: Matt Fig on 9 Dec 2012
I am confused about your question. You say you want to have C be a 2-by-3-by-4 array at the end of the loop, correct? That is exactly what you have at the end of your loop!
>> clear all
for jj = 1:4
C(:,:,jj)=A; % Semicolon!!
whos C % This tells us what we have in C.
Name Size Bytes Class Attributes
C 2x3x4 192 double
Notice that C is the exact size you want. I wonder if you got confused by leaving off the semicolon so that while the loop was running and so you saw C being built-up for every iteration? This is just one reason to not forget to put a semicolon on your lines of code! There is no practical reason to watch all that screen-dump!
Also, why not just do:
C = randi([0 1],2,3,4); % No loop needed...