# [R] Help to make a specific matrix

From: Jose Claudio Faria <joseclaudio.faria_at_terra.com.br>
Date: Sun 10 Jul 2005 - 10:42:15 EST

The solution is probably simple but I need someone to point me to it. How can I to generate a matrix from a numeric sequence of 1:10 like 'A' or 'B' below:

A)

```|--------------------|

|      1  2  3  4  5 |

|--------------------|

| 1 |  0             |
| 2 |  1  0          |
| 3 |  2  5  0       |
| 4 |  3  6  8  0    |

```
| 5 | 4 7 9 10 0 |
```|--------------------|

```

B)

```|--------------------|

|      1  2  3  4  5 |

|--------------------|

| 1 |  0  1  2  3  4 |
| 2 |  1  0  5  6  7 |
| 3 |  2  5  0  8  9 |
| 4 |  3  6  8  0 10 |

```
| 5 | 4 7 9 10 0 |
```|--------------------|

```

This question is related with the possible combinations of five objects two the two, i.e, C(5,2).

Any help would be greatly appreciated.

Regards,

```--
Jose Claudio Faria
Brasil/Bahia/UESC/DCET
mails:
joseclaudio.faria@terra.com.br
jc_faria@uesc.br
jc_faria@uol.com.br
tel: 73-3634.2779

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