# stdsc¶

## Purpose¶

Computes the population standard deviation of the elements in each column of a matrix.

## Format¶

y = stdsc(x)
Parameters

x (NxK matrix) – data

Returns

y (Kx1 vector) – the standard deviation of each column of x.

## Examples¶

// Create 3 columns of random normal numbers
y = rndn(8100, 3);

// Calculate the standard deviation of each column
std = stdsc(y);


The return, in variable std is equal to:

1.00095980
0.99488832
1.00201375


## Remarks¶

This function essentially computes:

sqrt(1/(N)*sumc((x - meanc(x)')2))


Thus, the divisor is $$N$$ rather than $$N-1$$, where $$N$$ is the number of elements being summed. See stdc() for the alternate definition.