how can i slice the symbolic function converted with matlabfunction?

hi friends

i have a symbolic function that i want to slice it. i converted it with "matlabfunction". now i want to create slice with it but it errors

my code is too long and here there is a code like my code. then i should use sym functions.

the code like my code:---------------------------------------------------------------

syms x y z

r = x^2 + y^2 + z^2;

s = matlabFunction(r);

[x,y,z] = meshgrid(-2:.2:2,-2:.25:2,-2:.16:2);

xslice = [-1.2,.8,2]; yslice = 2; zslice = [-2,0];

slice(x,y,z,s,xslice,yslice,zslice)

colormap hsv

----------------------------------------------------------------------

help me if you can

thanks a lot

Answer 1

[Sean de Wolski]

You need to evaluate the function s() at the points on the grid:

slice(x,y,z,s(x,y,z),xslice,yslice,zslice)

[Moein]

yessss

it works correctly!!!

i will submit my paper next week with your help.

thanks a lot Saen De Wolski

Answer 2

[Mischa Kim]

Moein, this seems to be a duplicate of your other question. For the above problem/function you could simply use

 [x,y,z] = meshgrid(-2:.2:2,-2:.25:2,-2:.16:2);
 r       = x.^2 + y.^2 + z.^2;
 xslice  = [-1.2,.8,2]; yslice = 2; zslice = [-2,0];
 slice(x,y,z,r,xslice,yslice,zslice)
 colormap hsv

[Moein]

i know this solution, but i said this is not my code. it's a code like my code, so i should use the symbolic function and use matlabfunction to convert it.