Tried different ways to apply unapply but failed:

a := .1994;

modfit3 := a*x^1.5;
 
f := unapply(rhs(modfit3), x);
%;
Error, invalid input: rhs received .1994*x^1.5, which is not valid for its 1st argument, expr

What's wrong here?

S

How can I integrate the value of different k values in the plot function, instead of assigning values to k before giving the plot comman? Can't see anything about this in the help file.

staffan

I'm trying to calculate flux through a cone but gets the following:

Flux(VectorField(`<,>`(x, y, z), cartesian[x, y, z]), Surface(`<,>`(x,y,z), x^2+y^2<=2*a,z = 2*a-sqrt(x^2+y^2)))
Error, (in VectorCalculus:-Flux) error with surface input