Changes between Initial Version and Version 1 of Ticket #793

Timestamp:

Dec 4, 2009, 8:50:45 AM (15 years ago)

Author:

Víctor de Buen Remiro

Comment:

I've checked this function and it's all right. You may want to write this?

  Matrix mat = Rand(100, 1, 0, 30);
  Matrix permutation = Sort(mat, SetOfReal(1));
  Matrix sorted = PivotByRows(mat,permutation);

I think the description of this function could help you

Sort {Matrix Sort(Matrix mat, Set criterium)

• English: Sorts rows of a matrix given a mixed criterium of ascent or descent columns. For example, criterium=[[-2,3]] sorts by 2-nd column descent and 3-th one ascent in case of tie. Returns the permutation matrix p such that PivotByRows(mat,p) is the sorted matrix.

• Spanish: Ordena las filas de una matriz dado un criterio mezclado de columnas ascendentes y descendentes. Por ejemplo, criterium=[[-2,3]] ordena por la segunda columna descendente y por la tercera ascendente en caso de empate.Devuelve la matriz de permutación tal que PivotByRows(mat,p) es la matriz ordenada.