Top
Back: sparsepoly
Forward: sparseHomogIdeal
FastBack:
FastForward:
Up: random_lib
Top: Singular Manual
Contents: Table of Contents
Index: Index
About: About this document

D.2.10.8 sparsetriag

Procedure from library random.lib (see random_lib).

Usage:
sparsetriag(n,m[,p,b]); n,m,p,b integers

Return:
nxm lower triagonal integer matrix, diagonal entries equal to 1, about p percent of lower diagonal entries are 0, the remaining are random integers >=1 and <= b; [defaults: (p,b) = (75,1)]

Example:
 
LIB "random.lib";
sparsetriag(5,7);"";
==> 1,0,0,0,0,0,0,
==> 0,1,0,0,0,0,0,
==> 0,1,1,0,0,0,0,
==> 0,0,0,1,0,0,0,
==> 1,1,0,0,1,0,0 
==> 
sparsetriag(7,5,90);"";
==> 1,0,0,0,0,
==> 0,1,0,0,0,
==> 0,1,1,0,0,
==> 0,0,0,1,0,
==> 0,0,0,0,1,
==> 0,0,0,1,0,
==> 0,1,0,0,0 
==> 
sparsetriag(5,5,0);"";
==> 1,0,0,0,0,
==> 1,1,0,0,0,
==> 1,1,1,0,0,
==> 1,1,1,1,0,
==> 1,1,1,1,1 
==> 
sparsetriag(5,5,50,100);
==> 1,0,0,0,0,
==> 73,1,0,0,0,
==> 0,79,1,0,0,
==> 14,0,0,1,0,
==> 0,48,23,0,1 


Top Back: sparsepoly Forward: sparseHomogIdeal FastBack: FastForward: Up: random_lib Top: Singular Manual Contents: Table of Contents Index: Index About: About this document
            User manual for Singular version 4.3.2, 2023, generated by texi2html.