Function: vnapply - Make a function from an expression and arguments (replacement for unapply)

Calling Sequence:

vnapply(expr, vars);

Parameters:

expr - any expression

vars - one or more variables (may be any non-constant expressions)

Description:

Examples:

> f1:= unapply(diff(g(x,y),x,y),x,y);
f2:= vnapply(diff(g(x,y),x,y),x,y);

> f1(3,4); f2(3,4);

Error, (in f1) wrong number (or type) of parameters in function diff

> V:= vector([x,x^2]): f1:= unapply(V,x);
f2:= vnapply(V,x);

> f1(u),f2(u);

> V:= Matrix([[a,b],[a+1,c]]); f1:= unapply(V,(a,b));
f2:= vnapply(V,(a,b));

> f1(q,r), f2(q,r);

> unapply(x+g(z),g(z));

Error, (in unapply) variables must be unique and of type name

> vnapply(x+g(z),g(z));

Maple Advisor Database R. Israel, 1998