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Aide de Scilab >> Fonctions Elémentaires > ismatrix

# ismatrix

check if a variable is a matrix

t=ismatrix(x)

### Arguments

x

scalar,vector, matrix, hypermatrix, list, array of structures or cells

t

a boolean

### Description

ismatrix(x) returns true if x is a matrix. Scalars and vectors are considered as matrix, and it is the same for hypermatrix only if one of its three dimensions equals to 1.

 Note that matrix([]) returns false.

### Examples

ismatrix(ones(10,5))
ismatrix(1)
ismatrix(["s" "t" "u"; "t" "s" "u"])
ismatrix(rand(2,1,3)) //because of singleton
ismatrix(rand(2,2,3)) //hypermatrix
s = struct();
ismatrix(s) // Empty structure
clear s
s(1,2).a = 3;
s(1,3).b = %z;
ismatrix(s) // Row array of structures
clear s
s(2,1).a = "w";
s(3,1).b = %t;
iscolumn(s) // Column array of structures
clear s
s(1,2).a = -2;
s(3,1).b = %pi;
ismatrix(s) // 2D not-square array of structures
clear s
s(2,1,2).a = 3;
s(1,1,2).b = "test";
ismatrix(s) // 3D array of structures (with a singleton dim)
clear s
s(1,1,2).a = 3;
s(1,1,3).b = "test";
ismatrix(s) // 3D array of structures (with 2 singleton dims)
clear s
s(2,2,2).a = %f;
s(1,2,1).b = list(%e, %s);
ismatrix(s) // 3D (cubic) array of structures