Data must be numeric, datetime, duration or an array convertible to double.

I wrote a following code. It shows error:"Data must be numeric, datetime, duration or an array convertible to double."

clear all
clc
syms x
h=4;
q=0; 
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)))
pa1=0.5*gma*x^2*ka1
x=0:0.1:5;
plot(pa1,x)

[madhan ravi]

s, null?

Answer 1

[madhan ravi]

syms x
h=4;
q=0; 
delta=26;
phi=39;
kh = 0;
kv=0;
s=...; % didn't define s
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;
leg=...; % didn't define leg
Null=...;
A = lam * s / (1 + Null);
    %   ^---only one
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) * (leg*(m ) + tan (alphac) * sin (m)))
                    %  ^---- missed it
pa1 = matlabFunction(0.5 * gma * x ^ 2 * ka1);
x=0:0.1:5;
plot(pa1(x),x)

[Akshay Pratap Singh]

thanks a lot @madhan ravi