testmatrix generate special matrices, such as Hilbert, Franck

## Syntax

    [y] = testmatrix(name, n)

## Arguments

name

  a character string

n

  integers, matrix size

y

  `n` x `n` matrix

## Description

Creates some particular matrices.

testmatrix('magi',n)

  returns a magic square of size `n` x `n`.

testmatrix('frk',n)

  returns the Franck matrix.

testmatrix('hilb',n)

  is the inverse of the `n` x `n` Hilbert matrix `(Hij= 1/(i+j-1))`.

## Examples

    testmatrix('magi',3)
    testmatrix('frk',10)
    testmatrix('hilb',4)