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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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