Best function instead of for loop and if loop

Question

HG-NU 2020-5-12

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https://ww2.mathworks.cn/matlabcentral/answers/524768-best-function-instead-of-for-loop-and-if-loop

评论： HG-NU 2020-5-12

采纳的回答： Geoff Hayes

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I believe for loop and if condition sometimes not the best option for the computer RAM and Memory.

Is there any function can do my job at least avoiding for loop and if condition or at least one of them?

The job is:

Assume I have this array A.

A=[1 2 6; 1 2 2; 1 2 3]

I want to save the values of the last column of the array A in a new array 'Show', when Only if the values of the last column of array A is between 2 and 5. Other elements less or above the condition will be 0 in array Show.

Is there anyway suggest for the solution please?

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James Tursa 2020-5-12

What have you done so far? What specific problems are you having with your code? A(:,end) is the last column of A. You can save that in Show then manipulate the elements as you like.

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Answer 1

Geoff Hayes 2020-5-12

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https://ww2.mathworks.cn/matlabcentral/answers/524768-best-function-instead-of-for-loop-and-if-loop#answer_431891

在 MATLAB Online 中打开

HG-NU - try something like

A=[1 2 6; 1 2 2; 1 2 3];
Show = A(:,end);               % <---- get the last column of A
Show(Show < 2 | Show > 5) = 0; % <---- use logical indexing to set elements outside of (2,5) to zero