How can I store vectors from three loops?
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Hello everyone,
I'm running into this problem in my code where I have three for loops within each other and I would like to save the results as a function of all three loop variables. I have not been able to figure out how to do that. Below is a sample code of what I have in order to show the problem more clearly than my phrasing of the question. In the example below, I'm trying to save d as a function of i, j, and k. I tried doing d(i,j,k), but that doesn't work.
for i = 1:10
for j = 2:30
for k = 3:50
a = 10*i;
b = 20*j*i;
c = 40*k;
d = a*b/c;
end
end
end
I really appreciate your help! Thanks!
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Answers (3)
dpb
on 24 Jul 2014
Sure it works, just write d(i,j,k)
But, since Matlab doesn't allow for starting arrays with lower indices other than 1, you'll have two empty planes and a column of zeros besides the actual numeric values.
The Matlab way would be
[x1,x2,x3] = ndgrid(1:10, 2:30, 3:50);
d=5.*x1.*x2./*x3;
The '5' is 10*20/40 in a consolidation of the constants.
doc ndgrid % for the details
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Azzi Abdelmalek
on 24 Jul 2014
[a,b,c,d]=deal(zeros(10*29*48,1));
p=0;
for i = 1:10
for j = 2:30
for k = 3:50
p=p+1;
a(p) = 10*i;
b(p) = 20*j*i;
c(p) = 40*k;
d(p) = a(p)*b(p)/c(p);
end
end
end
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