Replacing the zero entry of a vector with the corresponding entry of another vector of the same dimension.

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Hassan 2018-2-18

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https://ww2.mathworks.cn/matlabcentral/answers/383376-replacing-the-zero-entry-of-a-vector-with-the-corresponding-entry-of-another-vector-of-the-same-dime

编辑： Hassan 2018-2-20

采纳的回答： Birdman

Hello everyone,

Please I need some help about this:

Suppose I have 2 vectors A=[0;2;0] and B=[3;5;7]. How can I write a command in MATLAB that simply replace the zero entries of vector A with the corresponding non-zero entries of vector B?

In general, if I have 2 vectors A and B of the same dimension, assuming vector A have some zero entries, but the vector B have no zero entries. How can I replace the all the zero entries of vector A with that of the corresponding entries of vector B?

Thanks for any help.

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Birdman 2018-2-18

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在 MATLAB Online 中打开

A(A==0)=B(A==0)

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Birdman 2018-2-18

在 MATLAB Online 中打开

A==0

This is logical indexing. It returns 1 for the elements that are zero, and 0 for the elements that are not. By the power of MATLAB, we can easily use this boolean output to obtain indexes for the zero elements of a in B vector as follows:

B(A==0)

This is equivalent to