Change condition 'A=253' into 'A(A=253)=0' with multiple values (for example: A=70 and A=253)

Question

Alberto Acri 2023-7-19

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https://ww2.mathworks.cn/matlabcentral/answers/1997953-change-condition-a-253-into-a-a-253-0-with-multiple-values-for-example-a-70-and-a-253

回答： Cris LaPierre 2023-7-19

采纳的回答： John D'Errico

value_GS.mat

在 MATLAB Online 中打开

Hi. I have this code:

value_GS = importdata("value_GS.mat");
value_GS(value_GS=253) = 0;

I want to change the last line of the code so that it can select the numbers 70 and 253.

For example:

value_GS(value_GS=70 && value_GS=253) = 0;

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Answer 1

John D'Errico 2023-7-19

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https://ww2.mathworks.cn/matlabcentral/answers/1997953-change-condition-a-253-into-a-a-253-0-with-multiple-values-for-example-a-70-and-a-253#answer_1275558

编辑：John D'Errico 2023-7-19

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You CAN use an and operator in there. That is fine if you have 2 or maybe even 3 cases. But one day when you have 27 possibilities to test for, you DON"T WANT TO TEST THEM ALL INDIVIDUALLY.

Instead, learn to use ismember. It tests to see which elements lie in a given set.

value_GS(ismember(value_GS,[70, 253])) = 0;

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Answer 2

Cris LaPierre 2023-7-19

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1997953-change-condition-a-253-into-a-a-253-0-with-multiple-values-for-example-a-70-and-a-253#answer_1275568

在 MATLAB Online 中打开

value_GS.mat

Use the or condition instead of the and. Also, use == to check for equality.

The pseudocode would be "If the value of value_GS is 70 or 253, change the value to 0".

load value_GS
value_GS
value_GS = 6×1
    70
   254
    70
    70
   255
   253
value_GS(value_GS==70 | value_GS==253) = 0
value_GS = 6×1
     0
   254
     0
     0
   255
     0