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WHILE LOOP program does not work

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sss dzu
sss dzu 2012-10-24
Please, any one tell me why my program does not work, thank you.
This is my program
a=[7 18 11 5;
2 8 10 13;
3 24 20 12;
21 1 20 17];
[m,n]= size(a);
Re=0;
i=1;
while i<=m;
j=1
while j<=n;
if ((a(i,j)<=15) & (a(i,j)>=4))
Re= Re+ a(i,j);
end
end
end
disp(Re)
  1 个评论
Walter Roberson
Walter Roberson 2012-10-24
In order for people to tell you why your program does not work, you have to tell them what the intended working of the program is.

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采纳的回答

Image Analyst
Image Analyst 2012-10-25
Try it without loops, in a more MATLAB-ish vectorized way:
indexesToSum = a>=4 & a<=15
Re = sum(a(indexesToSum))

更多回答（2 个）

Matt Fig
Matt Fig 2012-10-24
编辑：Matt Fig 2012-10-24
You do not increment i or j inside the loops.
i =i+1;
etc. Thus i will always be less than m, and j less than n.
sss dzu
sss dzu 2012-10-25
but i have to use while loop

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