check if a variable is a matrix
t=ismatrix(x)
scalar,vector, matrix, hypermatrix, list, array of structures or cells
a boolean
ismatrix(
returns true if x)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. |
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 |  |  |
| Версия | Описание |
| 5.5.0 | Function ismatrix introduced. |