How to add 10% normally distributed random error to the data?

I have a data set with dimension (11000,26). How to add 10% normally distributed random error to the data?

Answer 1

[KSSV]

Let A be your data.

[m,n] = size(A) ;
idx = randperm(m*n,round(m*n*10/100)) ;
A(idx) = randn(size(idx)) ;