gsort - decreasing order sorting

Calling Sequence

[s, [k]]=gsort(v )

[s, [k]]=gsort(v,flag1)

[s, [k]]=gsort(v,flag1,flag2)

Parameters

• v,s : real vector/matrix; character string vector/matrix
• flag1 : a string 'r', 'c','g','lr' and 'lc'.
• flag2 : a string 'i' for increasing and 'd' for decreasing order. k : vector or matrix of integers

Description

gsort is similar to sort with additional properties. The third argument can be used to chose between increasing or decreasing order. The second argument can be used for lexical orders.

[s,k]=gsort(a,'g') and [s,k]=gsort(a,'g','d') are the same as [s,k]=gsort(a). They perform a sort of the entries of matrix a, a being seen as the stacked vector a(:) (columnwise). [s,k]=gsort(a,'g','i') performs the same operation but in increasing order.

[s,k]=gsort(a,'lr') sort the rows of the matrix int(a) ( if a is a real matrix) or a (if a is a character string matrix) in lexical decreasing order. s is obtained by a permutation of the rows of matrix int(a) (or a) given by the column vector k) in such a way that the rows of s verify s(i,:) > s(j,:) if i<j. [s,k]=gsort(a,'lr','i') performs the same operation for increasing lexical order

[s,k]=gsort(a,'lc') sort the columns of the matrix int(a) ( if a is a real matrix) or a (if a is a character string matrix) in lexical decreasing order. s is obtained by a permutation of the columns of matrix int(a) (or a) given by the row vector k) in such a way that the columns of s verify s(:,i) > s(:,j) if i<j. [s,k]=gsort(a,'lc','i') performs the same operation for increasing lexical order

Examples

alr=[1,2,2;
     1,2,1;
     1,1,2;
     1,1,1];
[alr1,k]=gsort(alr,'lr','i')
[alr1,k]=gsort(alr,'lc','i')
 

See Also

find