Sam Perry
14 lines
434 B
Matlab
14 lines
434 B
Matlab
function [N, mean_vector, std_vector] = normalise_features(X)
|
|
%NORMALISE_FEATURES Normalise our features by subtracting the mean and
|
|
%dividing by the standard deviation
|
|
|
|
num_rows = size(X, 1);
|
|
|
|
mean_vector = mean(X);
|
|
std_vector = std(X);
|
|
|
|
%subtract column mean
|
|
N = X - ones(num_rows, 1) * mean_vector;
|
|
%divide each element by column standard deviation
|
|
N = N ./ (ones(num_rows, 1) * std_vector);
|
|
end |