MATLAB: Problem with symbolic calculation

Question

I want symbolic calculation .I write the code but error is displayed

syms a 
syms R
n=input('enter the value of n')
F(1)=1;
F(2)=0;
F(3)= a;
aplha=input('enter the value of a=')
R=input('enter the value of reynold number R=')
 for i=1:n
  F(i+3)=2*alpha*R*F(i)+F(i+1);   
 end

Answer 1

aplha=input('enter the value of a=')

You assign to aplha . A. P. L. H. A

R=input('enter the value of reynold number R=')
 for i=1:n
  F(i+3)=2*alpha*R*F(i)+F(i+1); 

You use alpha . A. L. P. H. A.

You have not assigned to alpha.

alpha happens to exist as a function, but the function alpha requires that you pass a parameter to it, so you would get an error.

You need to change your input() to assign to alpha instead of aplha