[GAP Forum] IsMatrix

[Dr. Ashish Kumar Das]

Dear all,
I am confused with the command IsMatrix. In GAP a matrix is a list of
lists of equal length whose entries lie in a common ring. But if I
type  mat:=[[1,2,3],[2,3]]; and then run IsMatrix(mat); I get the
reply 'true'. Moreover, If I run DimensionsMat(mat); I get the reply
'[2,3]'. Can any one tell me why does this happen?

With regards

Ashish Kumar Das
NEHU, Shillong, INDIA