Conditional logic if possible empty result query

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maha ismail 2015-1-7

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/169179-conditional-logic-if-possible-empty-result-query

评论： dpb 2015-1-7

m1=  find((d1 <= r & x(source) < x & x<= x(destination) | ...
           d1 <= r & y(source) & y(destination)

This code is not responsible to what I need I need if the first condition give me an empty vector choose the second condition to provide the value for m1

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dpb 2015-1-7

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https://ww2.mathworks.cn/matlabcentral/answers/169179-conditional-logic-if-possible-empty-result-query#answer_164242

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Then separate the two and add the conditional..

condition1 = d1<=r & x(source)<x & x<=x(destination);  % first condition logical array
if isempty(condition1)
  m1=find(d1<=r & y(source) & y(destination));
else
  m1=find(condition1);
end

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maha ismail 2015-1-7

I don't know why it doesn't work correctly

dpb 2015-1-7

What does "doesn't work" mean, specifically? And, the above function contains the original code, not the suggested revision, anyway.

If it's a logic error that the result isn't what you expect, use the debugger and step through to see what/why isn't what you think you're coding. If it's a syntax error, post the complete text and context.

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