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How can i generalize "if statement"

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연승 김
연승 김 2021-3-22
评论： 연승 김 2021-3-23
Hi. everyone ~!
Thank you for reading^^
I'm a beginner to MATLAB, so please help me..!
I want to generalize "if statement" below for enlarging the size of instance.
In this code, I have described four variables(x(1), x(2), x(3), x(4)) in consideration of all possibilities.
I know that the way I code is very stupid...
how i can generalize in n variables...??
if (x(1)==1)&&(x(2)==1)&&(x(3)==1)&&(x(4)==1)
edges = edges;
elseif (x(1)==1)&&(x(2)==1)&&(x(3)==1)
edges = edges([1 2 3],:);
elseif (x(1)==1)&&(x(2)==1)&&(x(4)==1)
edges = edges([1 2 4],:);
elseif (x(1)==1)&&(x(3)==1)&&(x(4)==1)
edges = edges([1 3 4],:);
elseif (x(2)==1)&&(x(3)==1)&&(x(4)==1)
edges = edges([2 3 4],:);
elseif (x(1)==1)&&(x(2)==1)
edges = edges([1 2],:);
elseif (x(1)==1)&&(x(3)==1)
edges = edges([1 3],:);
elseif (x(1)==1)&&(x(4)==1)
edges = edges([1 4],:);
elseif (x(2)==1)&&(x(3)==1)
edges = edges([2 3],:);
elseif (x(2)==1)&&(x(4)==1)
edges = edges([2 4],:);
elseif (x(3)==1)&&(x(4)==1)
edges = edges([3 4],:);
elseif (x(1)==1)
edges = edges(1,:);
elseif (x(2)==1)
edges = edges(2,:);
elseif (x(3)==1)
edges = edges(3,:);
elseif (x(4)==1)
edges = edges(4,:);
else
edges = [1 1 ; 2 2];
end

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采纳的回答

Stephen23
Stephen23 2021-3-22
编辑：Stephen23 2021-3-22
Assuming that x is a four-element numeric vector or logical vector, something like this should work:
if any(x)
edges = edges(x==1,:);
else
edges = [1,1;2,2];
end
You need to learn how to use logical indexing, which is a simple and powerful way to access data in arrays:
https://www.mathworks.com/company/newsletters/articles/matrix-indexing-in-matlab.html
https://www.mathworks.com/help/matlab/math/array-indexing.html
  1 个评论
연승 김
연승 김 2021-3-23
Thank you!!! it works.
And I'll study about indexing in your links.
Thank you!!

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