I have a mistake in loops

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sznailc
sznailc 2021-11-5
编辑： Stephen23 2021-11-5
Hello, I have somewhere a mistake that if N = 1000 the output misses some lines (don't know which), so I suppose there's a mistake somewhere in for loops. It works correctly with N = 50, 100, 500.
function [R, I] = problem2B(N)
I = 0;
for a = 3:N
for b = a:N
for c = b:N
if (a^2 + b^2) == c^2 && a+b+c < N
R(I+1, :) = [a+b+c, a, b, c];
I = I + 1;
elseif N < 12
R = zeros(4, 1);
end
end
end
end
if N <= 50
R = reshape(nonzeros(R), I, 4);
else
R = sortrows(R, 1);
end
end
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sznailc
sznailc 2021-11-5
编辑：sznailc 2021-11-5
I have a test file that says, that not all possible pythagorean triples are displayed with N = 1000. Therefore I think there has to be a mistake with indexes that it skips some possible triples.
Stephen23
Stephen23 2021-11-5
编辑：Stephen23 2021-11-5
Note that if you change to
R = zeros(0,4);
then you can get rid of NONZEROS and RESHAPE.

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采纳的回答

Steven Lord
Steven Lord 2021-11-5
Does your problem ask you to find all Pythagorean triples whose elements sum to less than 1000 or all whose elements sum to less than or equal to 1000?
  1 个评论
sznailc
sznailc 2021-11-5
wow, thank you, edited to a+b+c <= N. I couldn't tell what triple is missing and didn't know that it might be 1000

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