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Aide de Scilab >> Matrices creuses > Manipulation des Matrices Creuses > issparse

issparse

tests whether the input is sparse encoded (numeric or boolean)

Syntax

res = issparse(S)

Arguments

S

a scilab object

res

boolean: %T if the matrix is a sparse, and %F otherwise/

Description

res = issparse(S) returns %T (true) if S is a sparse boolean or numerical matrix, and %F (false) otherwise.

Examples

sp = sprand(10, 20, 0.1);
if issparse(sp) then
   mprintf("Number of non-zero components: %d", nnz(sp));
end

A = %pi;
if ~issparse(A) then
    disp("A is not a sparse matrix");
end

spb = sp~=0 & sp < 0.5;
issparse(spb)
nnz(spb)

See also

  • isreal — Retourne %F si la matrice est encodée en numération complexe
  • sparse — sparse matrix definition
  • type — Retourne le type d'un objet Scilab
  • typeof — type explicite ou code de surcharge d'un objet Scilab

History

VersionDescription
6.0.2
  • issparse() now returns a boolean %T or %F instead of 1 or 0.
  • issparse() is now true as well for sparse booleans.
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Last updated:
Thu Feb 14 14:59:57 CET 2019