
1282 LINEAR PARTIAL DIFFERENTIAL EQUATIONS WITH MAPLE
Predefined functions: most of the well-known functions are predefined by Maple, and
they are known to some Maple functions (e.g.,
diff
,
evalc
,
evalf
,
expand
,
series
,
simplify
). Numerous special functions are defined (see
?FunctionAdvisor
).
User-defined functions: the functional operator (
->
) (see
?->
); e.g., the function f (x) =
sinx is defined as
f:=x->sin(x);
Alternative definitions of functions:
unapply
converts an expression to a function, and
a procedure is defined with
proc
.
Evaluation of function f (x) at x = a, {x = a,y = b}, e.g.,
f(a); subs(x=a, f(x));
eval(f(x),x=a);
In the Maple language, there are two