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Problem using polyfit and syms in a for loop

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Bob
Bob on 14 Dec 2014
Commented: Image Analyst on 14 Dec 2014
Here is my code.
Z=[3 1];
for i=1:length(Z);
syms a
x=5*a-Z(:,i)
A(i)=solve(x,a);
syms b
y=3*a+Z(:,i)
B(i)=solve(y,b);
A(i)=Z(i)+2;
B(i)=Z(i)-7;
xfit=[0 1];
yfit1(:,i)=[A(i),B(i)]
pfit1(:,i)=polyfit(xfit1,yfit1(:,i),1);
pval1(i,:)=polyval(pfit1(i,:),xfit1);
The error message I am getting is:
Error using polyval: Inputs must be floats, namely single or double.
I tried running a similar code and without the syms part and the code worked fine. How do I get my code to work with syms?

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