Masking an array back to a selected region in a Matrix

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waqas 2019-9-23

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https://ww2.mathworks.cn/matlabcentral/answers/481685-masking-an-array-back-to-a-selected-region-in-a-matrix

评论： waqas 2019-9-23

采纳的回答： Andrei Bobrov

matlab.mat

Hi,

I have a column vector which I need to insert back to the a matrix(Attached in .mat file). The variable region has logicals in the places where I want to put the data given by variable name vdisp_selected. Is there an efficient way of achieving this by masking?

I tried to play around with masking based on region but I am getting a square region in the end.

Cheers,

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Fabio Freschi 2019-9-23

region is 304x640 (double), vdisp_selected is 16472x1 (logical). How vdisp_selected is related to region?

waqas 2019-9-23

Hi,

Its the otherway around. 'region' is a 304x640 (logical) while vdisp_selected(16472x1) is a double. 'region' has (16742x1) ones and the locations where I have 1, I want to put the data of vdisp_selected.

I initially used the 'region' to extract data from another matrix and now want to insert updated data back to the same locations.

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采纳的回答

Andrei Bobrov 2019-9-23

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https://ww2.mathworks.cn/matlabcentral/answers/481685-masking-an-array-back-to-a-selected-region-in-a-matrix#answer_393118

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out = double(region);
out(region) = vdisp_selected;

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waqas 2019-9-23

Thanks.

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