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# I need help with defining while loops?

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Najib Ahmadi on 13 Nov 2015
Closed: MATLAB Answer Bot on 20 Aug 2021
Hello. I want write a code which can performe to generate matrix automaticlly. In the last while loop in my code I want to define that the 3:rd column and 2:nd row is =5 and the 2:nd column and 2:nd row is = 7 and the rest of the row tow is = 0 when we do not have any more number. Plz help me to solve this issue.
My code
% -------------------------------------
a=386;
b=75;
nrows=2;
stra= num2str(a); %#########convert (a) to string format
strb=num2str(b); %#########convert (b) to string format
sizea= length(stra);
sizeb= length(strb);
% M=zeros(sizea, sizeb);
if sizea > sizeb
ncols = sizea
M= zeros (nrows, ncols)
while sizea >= 1
M(1, sizea) = str2num(stra(1, sizea)) %(stra(stra(1), size(a)))
sizea=sizea-1
end
else
ncols=sizeb
M=zeros (nrows, ncols)
end
while sizeb >= 1
M(2, sizeb) = str2num(strb(1,sizeb))
sizeb=sizeb-1
sizea=sizea-1
end
##### 2 CommentsShowHide 1 older comment
Thorsten on 13 Nov 2015
What is the expected output in your example with a=386 and b=75?

Eng. Fredius Magige on 13 Nov 2015
Your increment is missing which support to allow application of while. Both if and else are inner within wile loop as well as to end by end.
Najib Ahmadi on 13 Nov 2015
Is it possible for you write the code. Because in my case it did not work! appriciate for ur help

Thorsten on 13 Nov 2015
Edited: Thorsten on 13 Nov 2015
Do you want to put the digits of a "a" and "b" into the elements of a matrix? The you can use this code:
M = num2str([a; b]) - '0';
M(M==' ' - '0') = 0
M =
3 8 6
0 7 5