使用randn生成标准正态随机数，并对其进行移位和缩放。

nRows = 10;
nCols = 4;

% Example
meanVal = 3.14;
stdDev = 2.73;

samples = meanVal + randn(nRows, nCols) * stdDev;

% Compute mean and std deviation from samples
m = mean(samples(:));
s = std(samples(:));

% m should be close to meanVal, s close to stdDev