The Code Runs Too Long, Should I Abort It?

Question

Ashvin Hamzah Driwantara 2016-12-14

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/316880-the-code-runs-too-long-should-i-abort-it

编辑： Adam 2016-12-14

采纳的回答： Adam

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I run this code and I think it runs too long. Any solution?

c6 and c3 is matrix with 3300x2200 grids.

if true
e=0.06+c6;
f=c3;
[m,n]=size(f);
for i=1:m;
  for j=1:n;
      if f(i,j)>e;
         t(i,j) = 1;
      else
         t(i,j) = 0;
      end
  end
end
end

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Answer 1

Adam 2016-12-14

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/316880-the-code-runs-too-long-should-i-abort-it#answer_247173

编辑：Adam 2016-12-14

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Can't you just replace the whole thing with:

t = c3 > e;

or

t = double( c3 > e );

if you want the 0s and 1s as doubles rather than logicals?

doc vectorization

gives an introduction to this very powerful alternative to nested for loops which is almost always noticeably faster too.

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Ashvin Hamzah Driwantara 2016-12-14

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u mean like this?

if true
e=0.06+c6;
f=c3>e;
[m,n]=size(f);
for i=1:m;
  for j=1:n;
      if f(i,j)==1;
         t(i,j) = 1;
      else
         t(i,j) = NaN;
      end
  end
end
end