How to replace/delete some elements of a Matrix to a certain value

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hasan haider
hasan haider 2019-10-23
评论： Steven Lord 2019-10-23
Hello everyone,
I have a matrix of 2799x7 matrix and i want to delete 10% of the data points or individual cells randomly. Or replace 10% of the data sets to zero. The size of the matrix should remain the same after the operation.
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Steven Lord
Steven Lord 2019-10-23
You can't delete individual elements of a numeric array in MATLAB to leave "holes" in the array. Guillaume listed how to replace a certain number of elements with 0's, but depending on what you're going to do with this data afterwards replacing them with NaN or missing instead of 0 may be more useful.
Generally 0 is more likely to be a valid data value than NaN. Because of this using the missing data functions (ismissing, rmmissing, fillmissing, standardizeMissing) on your 0-filled data may remove real data that happened to be 0 before you "deleted" 10% of your data points.

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Guillaume
Guillaume 2019-10-23
编辑：Guillaume 2019-10-23
yourmatrix(randperm(numel(yourmatrix), numel(yourmatrix) * 0.1)) = 0; %replace 1/10th of the elements chosen at random by 0

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