9.4.2 Finding symbolic variables in an expression
The
lname
or
indets
command finds the symbolic variable names used in an expression.
lname
takes
expr
, an expression.
lname(
expr
)
returns the list of the symbolic variable names used in
expr
.
Examples
lname
(
x
*
y
*
sin
(
x
))
⎡
⎣
x
,
y
⎤
⎦
a
:=2;
assume
(
b
>0);
assume
(
c
=3);
lname
(
a
*
x
^2+
b
*
x
+
c
)
⎡
⎣
x
,
b
,
c
⎤
⎦
