# How to plot both real and imaginary part of complex exponential?

조회 수: 11(최근 30일)
Duy Dang 27 Oct 2020
답변: Star Strider 27 Oct 2020
Hi, I'm new to matlab since I try to plot this signal as complex exponential form with 5 terms but I got stuck clc;
clear all;
close all;
t0 = 0;
T = 10;
k = 1:6
w = 2*pi/T
syms t
x = t^2 +(j*2*pi*t)
x1 = real(x)
y = imag(x)
k1 = -2: 2; %%% 5 terms
a = (1/T)*int(x*exp(-j*k1*w*t),t,t0,t0+T);

댓글을 달려면 로그인하십시오.

### 답변(1개)

Star Strider 27 Oct 2020
For best results, replace ‘j’ with ‘1j’, then convert the result to double to use plot (since fplot is likely to be more difficult with discrete values of ‘k1’):
a = (1/T)*int(x*exp(-1j*k1*w*t),t,t0,t0+T);
num_a = double(a); % Convert To ‘double’ To Plot
figure
plot(k1,real(num_a))
hold on
plot(k1,imag(num_a))
plot(k1,abs(num_a),'--k')
hold off
grid
legend('\Re(a)','\Im(a)', '|a|')
That should do what you want.
Otherwise, I would have suggested:
syms k2
a(k2) = (1/T)*int(x*exp(-1j*k2*w*t),t,t0,t0+T);
figure
fplot(real(a), [-2 2])
hold on
fplot(imag(a), [-2 2])
fplot(abs(a), [-2 2], '--k')
hold off
grid
legend('\Re(a)','\Im(a)', '|a|')
.

댓글을 달려면 로그인하십시오.

### Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!