MATLAB: Error while trying to image fourier transform of a function

fourierfunctionMATLABtransform

Hello the code is the following:
syms x 
x=-400:400;
Y(x)=1./(j*x+3);
abs(Y(x))
I am trying to image abs of function Y(x) where Y(x) is Fourier's transform of function h(t)=e^(-3t)*u(t) for x=[-400,400].
Everytime i get the following error message: Error using sym/subsasgn (line 920)
Invalid indexing or function definition.
Indexing must follow MATLAB indexing. Function
arguments must be symbolic variables, and
function body must be sym expression.
Please help!

Best Answer

x=-400:400;
Y=1./(j*x+3);
abs(Y)
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