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## How to get a matrix values' indices?

**From**: |
Mikolaj Karolczak |

**Subject**: |
How to get a matrix values' indices? |

**Date**: |
Tue, 28 Sep 2004 20:12:53 +0200 |

Hello,
Suppose we have a matrix of integer values. Is there any function to get quickly
matrices of each value's indices?
e.g.
I have:
[1 2 3
1 2 2
1 1 3]
I want:
-> 1: [1 1; 2 1; 3 1; 3 2]
-> 2: [1 2; 2 2; 2 3]
-> 3: [1 3; 3 3]
Surely I can get it by checking the value for every index but for big matrices
if works slowly.
Actually I need to calculate the 'specific gravity' of each value in the matrix
- the mean values of each value's indices. Maybe there is a function to do it
yet simplier?
Rgds,
Mikolaj
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**How to get a matrix values' indices?**,
*Mikolaj Karolczak* **<=**