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

조회 수: 8(최근 30일)
Duy Dang 2020년 10월 27일
답변: Star Strider 2020년 10월 27일
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);
%%% i dont know how to plot it please help

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### 답변(1개)

Star Strider 2020년 10월 27일
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|')
.

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