How to substitute some elements from a vector

Question

Viridiana Torres 2016-5-10

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/283441-how-to-substitute-some-elements-from-a-vector

回答： Andrei Bobrov 2016-5-10

Hello everyone!

If i have the next vector Z=[10;10;10;11;11;13;13] which is associated to another vector: X=[1;6;65;34;21;73;14] a nd I want to create a third vector, Y, with almost all the elements in X, but just replacing a 0 in X BEFORE the element (i,j) from Z changes. How can I do this? In this example my desire outcome would be the next vector Y=[1;6;0;34;0;73;14]

Thanks a lot for your help!

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Answer 1

Andrei Bobrov 2016-5-10

2
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https://ww2.mathworks.cn/matlabcentral/answers/283441-how-to-substitute-some-elements-from-a-vector#answer_221555

在 MATLAB Online 中打开

Y = X;
Y([diff(Z(:))~=0;false]) = 0

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Answer 2

Star Strider 2016-5-10

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/283441-how-to-substitute-some-elements-from-a-vector#answer_221538

编辑：Star Strider 2016-5-10

在 MATLAB Online 中打开

This works:

Z=[10;10;10;11;11;13;13];
X=[1;6;65;34;21;73;14];
idx = diff([Z; 0]) > 0;                     % Logical Vector Detecting Transitions
Y = zeros(size(X));
Y(~idx) = X(~idx)
Y =
     1
     6
     0
    34
     0
    73
    14