cmoment - central moments of all orders

### Calling Sequence

  `mom=cmoment(x,ord)`
  `mom=cmoment(x,ord,'r') or mom=cmoment(x,ord,1)`
  `mom=cmoment(x,ord,'c') or mom=cmoment(x,ord,2)`

### Parameters

- `x` : real or complex vector or matrix
- `ord` : positive integer

### Description

cmoment`(x,ord)` is the central moment or order ord of the elements of `x`. If a third argument of type string `'r'` (or `1` ) or `'c'` (or `2`) is used, we get in the first case, a row vector `mom` such that `mom(j)` contains the central moment of order `ord` of the `j` column of `x`. `cmoment(x,ord,'c')` is used in the same way for the central moments in the rows.

### REFERENCES

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

### Examples

    x=[0.2113249 0.0002211 0.6653811;
       0.7560439 0.3303271 0.6283918]
    mom=cmoment(x,3)
    mom=cmoment(x,2,'r')
    mom=cmoment(x,3,'c')

### See Also

`sum` `median` `st_deviation` `mean` `meanf` `moment` `nanmean` `nanmeanf` `stdev` `stdevf` `variance` `variancef` `nanstdev`

### Author

Carlos Klimann