Fourier Transform modeling in MATLAB

Please find code below: 

function [ X ] = ftransform(f,L1,L2 )

%   Detailed explanation goes here

% ftransform is a function which is use to convert time domin no preodic

% function  to frequency domin. It also draw the magnitude and Phase plot.

%syntax is given below..

%ftransform (function, first limit , final limit)

syms t

syms w j positive;

X= int(f*exp(-j*w*t),t,L1,L2);

%X=simplify(X);

disp(' X(jw)'),pretty(X)

w=-20:.01:20;

inline(X); 

ans(-20:.01:20);

subplot(2,1,1);

plot(w,real(ans),'g','linewidth',2)

title('|X(jw)| Frequency Domein ')

xlabel('(w)   Range')

grid on;

subplot(2,1,2)

plot(w,imag(ans),'r','linewidth',2.5);

title('< X(jw) Angle')

grid on

 end

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