1 | initial version |

To get some documentation on how to create custom matrices, you can do:

```
sage: matrix?
```

You will

For example, if you want that the entry `[i,j]`

has value `i*j^2`

(say), you can do:

```
sage: m = 4 ; n = 5
sage: matrix(QQ, m, n, lambda i, j: i*j^2)
[ 0 0 0 0 0]
[ 0 1 4 9 16]
[ 0 2 8 18 32]
[ 0 3 12 27 48]
```

2 | No.2 Revision |

To get some documentation on how to create custom matrices, you can do:

```
sage: matrix?
```

You will see some examples using a function taking a pair `(i,j)`

and returning some `f(i,j)`

to be placed in the entry `[i,j]`

of the constructed matrix.

For example, if you want that the entry `[i,j]`

has value `i*j^2`

(say), you can do:

```
sage: m = 4 ; n = 5
sage: matrix(QQ, m, n, lambda i, j: i*j^2)
[ 0 0 0 0 0]
[ 0 1 4 9 16]
[ 0 2 8 18 32]
[ 0 3 12 27 48]
```

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