MATLAB: How to use syms variables in function

syms

i wrote a function for matrix:
%=============================
function [A] = Test(a,b)
A(1,1)=a+1;
A(1,2)=b;
end
%=======================
the function is nothing special. when i input in Command Window area of Matlab:
>> syms a b
>> Test(0,b)
but Matlab shows:
The following error occurred converting from sym to double: DOUBLE cannot convert the input expression into a double array. Error in Test (line 3) A(1,2)=b;
Matlab tell me there is a mistake(my Expect to return: A=[1,b])
how to fix this problem,thank you very much!

Best Answer

In order to do that, you will have to convert ‘A’ to a symbolic object as well: 
function [A] = Test(a,b)
    A = sym('A',[1 2])
    A(1,1)=a+1;
    A(1,2)=b;
end
then: 
Q = Test(0,b)
Q =
[ 1, b]
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