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

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.

[Steven Lord]

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.

Answer 1

[Guillaume]

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

[hasan haider]

Its giving an error. Are you sure that there will be = ?

[Guillaume]

It was missing a closing bracket. Fixed now.