How to do a "for-loop"?

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Matrix
Matrix 2023-6-4
编辑： VBBV 2023-6-4
I have this code. My concern is in the "l" loop
for k=1:width(tt)
for l=34736:34736
recnum(l) = l;
signum(k) = k;
y{l,k} = tt.(signum(k)){recnum(l)};
end
end
then I want to change the loop "l" (until 35336)
l = 34737:34737
for k=1:width(tt)
for l=34737:34737
recnum(l) = l;
signum(k) = k;
y{l,k} = tt.(signum(k)){recnum(l)};
end
end
then
for k=1:width(tt)
for l=34738:34738
recnum(l) = l;
signum(k) = k;
y{l,k} = tt.(signum(k)){recnum(l)};
end
end
........
Finally:
for k=1:width(tt)
for l=35336:35336
recnum(l) = l;
signum(k) = k;
y{l,k} = tt.(signum(k)){recnum(l)};
end
end
As you can see, the loop "l" is changing from 34736 until 35336. Where should I put the loop properly so that I do not need to write "for-loop" until 600 times (from 34736 to 35336)?

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回答（2 个）

Prannoy
Prannoy 2023-6-4
Ran in:
You can instead insert a for loop like this :
for k=1:width(tt)
for x=34736:35336
for l = x:x
recnum(l) = l;
signum(k) = k;
y{l,k} = tt.(signum(k)){recnum(l)};
end
end
end
Unrecognized function or variable 'tt'.
This should solve your problem.
VBBV
VBBV 2023-6-4
编辑：VBBV 2023-6-4
Hi Matrix,
What you need in this case is not for loop but a while loop which can avoid writing a loop 600 times and hence much better in terms of program execution time
for k=1:width(tt)
% define the starting point
L = 34736;
while L <= 35336
recnum(L) = L;
signum(k) = k;
y{L,k} = tt.(signum(k)){recnum(L)};
% use the increment till the count 35336
L = L + 1;
end
end

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