I keep getting Undefined function or method 'mtimes' for input arguments of type 'cell'.

h=2;
[V] = fuelvol1( h )

and the function file is

function[V] = fuelvol1( h )
%   
global r H L
r=0.95;  %feet
H=2.0;   %ft
L=5.0;   %ft
d=h-H;
A=(2*r*L*H);
B=(r-d)/r;
C=2*r*d;
D=r-d;
V =A+{(r*r*acos(B))-(D*(C-(d*d)))^0.5}*L;

Answer 1

[per isakson]

The error message is correct, multiplication is not defined for cell. Replace

V = A+{(r*r*acos(B))-(D*(C-(d*d)))^0.5}*L;

by

V = A+((r*r*acos(B))-(D*(C-(d*d)))^0.5)*L;