Send a matrix as a proc argument in Chapel - chapel

Question

I'm getting an error when I try to send a matrix into a proc. I'm pretty sure I'm doing something very wrong, can't figure it out.
use LinearAlgebra;
proc main() {
var A = Matrix(
[0.0, 0.8, 1.1, 0.0, 2.0]
,[0.8, 0.0, 1.3, 1.0, 0.0]
,[1.1, 1.3, 0.0, 0.5, 1.7]
,[0.0, 1.0, 0.5, 0.0, 1.5]
,[2.0, 0.0, 1.7, 1.5, 0.0]
);
check_dims(A);
}
proc check_dims(A: Matrix) {
var t: bool = false;
if (A.domain.dim(1) == A.domain.dim(2)){
t = true;
}
return t;
}
Gives me
mad.chpl:3: In function 'main':
mad.chpl:14: error: unresolved call 'check_dims([domain(2,int(64),false)] real(64))'
mad.chpl:17: note: candidates are: check_dims(A: Matrix)
I'm using chpl Version 1.15.0

Answer 1

Linear algebra objects (like matrices and vectors) are represented as arrays in Chapel. Therefore, changing Matrix (a type that does not exist) to [] (the syntax for array-type) should work as expected:
use LinearAlgebra;
proc main() {
var A = Matrix(
[0.0, 0.8, 1.1, 0.0, 2.0]
,[0.8, 0.0, 1.3, 1.0, 0.0]
,[1.1, 1.3, 0.0, 0.5, 1.7]
,[0.0, 1.0, 0.5, 0.0, 1.5]
,[2.0, 0.0, 1.7, 1.5, 0.0]
);
check_dims(A);
}
proc check_dims(A: []) {
var t: bool = false;
// method is dim()
if (A.domain.dim(1) == A.domain.dim(2)){
t = true;
}
return t;
}