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List
Syntax
List(E:OBJECT):LIST
where E has type LIST, MAT, or VECTOR.
Summary
convert an expression into a list
Description
This function converts the expression E into a list. It
is the same as Cast(E,LIST).
example
Use R ::= Q[x,y];
M:=Jacobian([x^2y^2,x+y]);
M;
Mat[
[2xy^2, 2x^2y],
[1, 1]
]
-------------------------------
Head(M);
-------------------------------
ERROR: Bad parameters
CONTEXT: Head(M)
-------------------------------
Head(List(M));
[2xy^2, 2x^2y]
-------------------------------
The error occurs because the function Head
only accepts lists as
arguments.
See Also