## Name

stdevf — standard deviation

## Calling Sequence

```s=stdevf(x,fre)
s=stdevf(x,fre,'r') or s=stdevf(x,fre,1)
s=stdevf(x,fre,'c') or s=stdevf(x,fre,2)```

## Parameters

x

real or complex vector or matrix

## Description

This function computes the standard deviation of the values of a vector or matrix ` x`, each of them counted with a frequency given by the corresponding values of the integer vector or matrix ` fre` who has the same type of ` x`.

For a vector or matrix ` x`, s=stdevf(x,fre) (or ` s=stdevf(x,fre,'*') ` returns in scalar ` s` the standard deviation of all the entries of ` x`, each value counted with the multiplicity indicated by the corresponding value of ` fre`.

`s=stdevf(x,fre,'r')` (or, equivalently, `s=stdevf(x,fre,1)`) returns in each entry of the row vector ` s` of type 1xsize(x,'c') the standard deviation of each column of ` x`, each value counted with the multiplicity indicated by the corresponding value of ` fre`.

`s=stdevf(x,fre,'c')` (or, equivalently, ` s=stdevf(x,fre,2)`) returns in each entry of the column vector ` s` of type size(x,'c')x1 the standard deviation of each row of ` x`, each value counted with the multiplicity indicated by the corresponding value of ` fre`.

## Examples

```
x=[0.2113249 0.0002211 0.6653811;0.7560439 0.9546254 0.6283918]
fre=[1 2 3;3 4 3]
m=stdevf(x,fre)
m=stdevf(x,fre,'r')
m=stdevf(x,fre,'c')
```

Carlos Klimann

## Bibliography

Wonacott, T.H. & Wonacott, R.J.; Introductory Statistics, fifth edition, J.Wiley & Sons, 1990.