MATLAB: Undefined operator ‘*’ for input arguments of type ‘function_handle’.

undefined operator '*' for input arguments of type 'function_handle'.

i wrote a following code. every thing is right but it shows error" Undefined operator '*' for input arguments of type 'function_handle'.
clear all
clc
syms x
h=4;
q=100;
delta=26;
phi=39;
kh=0;
kv=0;
psi=atan(kh/(1-kv));
da1=delta*(pi/180); pha1=phi*(pi/180);
m=pha1+da1;
b=pha1-psi;
c=psi+da1;
gma=18.4; nq=2*q/(gma*(x));
delta=26;
phi=39;
lam=0;
A=lam*nq/(1+nq);
alphac=atan((sin(m)*sin(b)+(sin(m)^2+sin(b)^2+sin(m)*cos(m)*sin(b)*cos(b)+A*cos(c)*cos(m)*sin(b))^0.5)/(A*cos(c)+sin(m)*cos(b)));
w=0.5*gma*(x)^2*(1/tan(alphac));
B=(x)*((1/tan(alphac))-lam);
ka1=((1+nq)*(1-A*tan(alphac))*(cos(b)-(sin(b)/tan(alphac))))/(cos(psi)*(cos(m)+tan(alphac)*sin(m)))
wt=w+q*B;
pa1 = matlabFunction(0.5*gma*x^2*ka1);
x=0:0.1:5;
R=(wt*(1-kv)-pa1*sin(da1))/cos(alphac-pha1);
za1=(0.5*R*cos(pha1)*(x/sin(alphac))-q*B*(lam*x+0.5*B)-(1/6)*(1/tan(alphac))*(gma/tan(alphac))*x^3)/(pa1*cos(da1))
plot(za1(x),x)

Best Answer

You have some mix between symbolic functions and function handles. You need to choose one strategy. Try the following code, which uses only symbolic functions:
syms x
h=4;
q=100; 
delta=26;
phi=39;
kh=0;
kv=0;
psi=atan(kh/(1-kv));
da1=delta*(pi/180);  pha1=phi*(pi/180);
m=pha1+da1;
b=pha1-psi;
c=psi+da1;
gma=18.4;   nq=2*q/(gma*(x));
delta=26;
phi=39;
lam=0;
A=lam*nq/(1+nq);
alphac=atan((sin(m)*sin(b)+(sin(m)^2+sin(b)^2+sin(m)*cos(m)*sin(b)*cos(b)+A*cos(c)*cos(m)*sin(b))^0.5)/(A*cos(c)+sin(m)*cos(b)));
w=0.5*gma*(x)^2*(1/tan(alphac));
B=(x)*((1/tan(alphac))-lam);
ka1=((1+nq)*(1-A*tan(alphac))*(cos(b)-(sin(b)/tan(alphac))))/(cos(psi)*(cos(m)+tan(alphac)*sin(m)))
wt=w+q*B;
pa1 = (0.5*gma*x^2*ka1); %changed

% x=0:0.1:5; %changed
R=(wt*(1-kv)-pa1*sin(da1))/cos(alphac-pha1);
za1=(0.5*R*cos(pha1)*(x/sin(alphac))-q*B*(lam*x+0.5*B)-(1/6)*(1/tan(alphac))*(gma/tan(alphac))*x^3)/(pa1*cos(da1))
   
fplot(za1,[0,5]) %changed
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