stdev - standard deviation of the values of a vector or matrix

Calling Sequence

s=stdev(x)

s=stdev(x,'r') or m=stdev(x,1)

s=stdev(x,'c') or m=stdev(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.

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

s=stdev(x,'r') (or, equivalently, s=stdev(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 .

s=stdev(x,'c') (or, equivalently, s=stdev(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.

Examples

x=[0.2113249 0.0002211 0.6653811;0.7560439 0.4453586 0.6283918]
s=stdev(x)
s=stdev(x,'r')
s=stdev(x,'c')

 

Author

Carlos Klimann

Bibliography

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