nanstdev - standard deviation (ignoring the NANs).

### Calling Sequence

  `s=nanstdev(x)`
  `s=nanstdev(x,'r') or m=nanstdev(x,1)`
  `s=nanstdev(x,'c') or m=nanstdev(x,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` (ignoring the NANs).

For a vector or a matrix `x` , `s=nanstdev(x)` returns in the scalar `s` the standard deviation of all the entries of `x` (ignoring the NANs).

`s=nanstdev(x,'r')` (or, equivalently, `s=nanstdev(x,1)` ) is the rowwise standard deviation. It returns in each entry of the row vector `s` the standard deviation of each column of `x` (ignoring the NANs).

`s=nanstdev(x,'c')` (or, equivalently, `s=nanstdev(x,2)` ) is the columnwise standard deviation. It returns in each entry of the column vector `s` the standard deviation of each row of `x` (ignoring the NANs).

In Labostat, NAN values stand for missing values in tables.

### Examples

    x=[0.2113249 0.0002211 0.6653811;
       0.7560439 %nan      0.6283918;
       0.3       0.2       0.5      ];
    s=nanstdev(x)
    s=nanstdev(x,'r')
    s=nanstdev(x,'c')

### Author

Carlos Klimann

### Bibliography

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