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# iqr

interquartile range

### Calling Sequence

q=iqr(x) q=iqr(x,'r') (or, equivalently, q=iqr(x,1)) q=iqr(x,'c') (or, equivalently, q=iqr(x,2))

### Arguments

- x
real or complex vector or matrix

### Description

This function computes the interquartile range IQR= upper
quartile - lower quartile of a vector or a matrix `x`

.

For a vector or a matrix `x`

, `q=iqr(x)`

returns in the scalar `q`

the interquartile range of
all the entries of `x`

.

`q=iqr(x,'r')`

(or, equivalently,
`q=iqr(x,1)`

) is the rowwise interquartile range. It returns in
each entry of the row vector `q`

the interquartile
range of each column of `x`

.

`q=iqr(x,'c')`

(or, equivalently,
`q=iqr(x,2)`

) is the columnwise interquartile range. It returns in
each entry of the column vector `q`

the
interquartile range of each row of `x`

.

### Examples

x = 1:10; // Interquartile range of vector 1 to 10 // Q1 = 3 and Q3 = 8, so iqr = 5 iqr(x)

### Bibliography

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

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