How to add 5% uniformly distributed Noise in the dataset

How can i add 5% of Noise to the dataset with uniform distrubution, i have implemented the code but noise is not uniformly distrubeted How can i do that

can any body please help me

load('datasetvalue.mat')
[rows, columns] = size(dataset);
noise = 0.05 * dataset .* (randn(rows, columns) - 0.5);
noisyData = dataset + noise;

Answer 1

[KSSV]

load('datasetvalue.mat')
[rows, columns] = size(dataset); 
N = zeros(rows,columns) ; 
% pick 5% of random indices 
idx = randsample(rows*columns,round(5/100*rows*columns));   
N(idx) = randn(size(idx)) ; 
noisyData = dataset + N;

[Med Future]

@KSSV its not working the output is not what i want, have you run my code above

[Med Future]

@KSSV the code you share it can not add noise to the data

Answer 2

[yanqi liu]

yse，sir，may be ues rand not randn to get uniformly distributed pseudorandom numbers

[Med Future]

@yanqi liu it not working can you please share some code?