Frequency domain conversion


by cobraa_eyz
Tags: conversion, domain, frequency
cobraa_eyz
cobraa_eyz is offline
#1
Feb6-09, 12:13 AM
P: 3
1. The problem statement, all variables and given/known data

Dear all ,

Am new to matalb and am having some couple of problems. i want to convert the following wave form from time to frequency domain .

1.E=ACos(ωt+φ).[0,T]
I have made conversion by using integration by parts.Please find the matlab attached files.

ACos(ωt+φ)*exp(-jωt) , limit [0,T]

2. For T=n*pi/2ω where n= odd, how to generate odd values of "n".

3. Graph
When ever i try to plot a graph between Amplitude and Time , it generates error or when ever i plot a graph between two variable values e.g
T 1:45;
Pi 0:360;
"??? Error using ==> mtimes
Inner matrix dimensions must agree."

2. Relevant equations

3. The attempt at a solution
T=n*pi/2w where w= omega
function L=laser()
%T=n*pi/2w where w= omega
w=2*pi*1.93*10^14;
phi= 0:360;
T=45;% just used to plot a graph

L= (-cos(phi)*w*sin(w*T)*exp(-j*w*T))+(w*cos(phi))-sin(phi)*(w*cos(w*T)*exp(-j*w*T)-w+ (w^2)*sin(w*T)*exp(-j*w*T)/(1+w^2))
subplot(1,1,1), plot(phi,L);
end

Thanks
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