9.1.19 Extracting subexpressions
The
part
command extracts subexpressions from an expression. (See Section
2.9.2
.)
part
takes two arguments:
expr
, an expression.
n
, an integer.
part(
expr
,
n
)
evaluates
expr
and then returns the
n
th sub-expression of
expr
.
Examples
part
(
x
^2+
x
+1,2)
x
part
(
x
^2+(
x
+1)*(
y
-2)+2,2)
⎛
⎝
x
+1
⎞
⎠
⎛
⎝
y
−2
⎞
⎠
part
((
x
+1)*(
y
-2)/2,2)
y
−2
