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## Re: matrix threshold calculation

**From**: |
Ben Abbott |

**Subject**: |
Re: matrix threshold calculation |

**Date**: |
Tue, 28 Apr 2009 08:45:00 -0400 |

On Tuesday, April 28, 2009, at 08:34AM, "Michael Creel" <address@hidden> wrote:
>
>*Francesco Potorti`-2 wrote:*
>*> *
>*>>I want to calculate the threshold value of a matrix. What i want is to*
>*>>find a value that is over the 95% percentages of the matrix values. Any*
>*>>idea how can i calculate this value via octave? *
>*> *
>*> A = rand (10, 10);*
>*> t = quantile (A(:), 0.95)*
>*> *
>*> -- *
>*> Francesco PotortÃ¬ (ricercatore) Voice: +39 050 315 3058 (op.2111)*
>*> ISTI - Area della ricerca CNR Fax: +39 050 315 2040*
>*> via G. Moruzzi 1, I-56124 Pisa Email: address@hidden*
>*> (entrance 20, 1st floor, room C71) Web: http://fly.isti.cnr.it/*
>
>*A note, the quantile function is not in Octave 3.0.1, but it is in 3.1.55. I*
>*copied it (and __quantile__.m into my working copy of 3.0.1, and it works*
>*like a charm. Very nice how a menu of methods is available. Many thanks to*
>*the authors.*
>*Michael*
>
The quatile.m and __quantile__.m functions are in 3.0.5, you may want to
upgrade.
Ben