Why this code gives error?

2 次查看(过去 30 天)
Sadiq Akbar
Sadiq Akbar2021-5-3
clear all
close all
N=1001;
f1=1.0000e9;
f2=1.0200e9;
fs=4*f1;
w1=2*pi*f1/fs;
w2=2*pi*f2/fs;
n=0:N-1;
s1=sqrt(1.00)*exp(i*w1*n);
s2=sqrt(0.10)*exp(i*w2*n);
wn=sqrt(0.10)*(randn(1,N)+i*randn(1,N));
x=s1+s2+wn;
x=x(:);
f=0:fs/(N-1):fs;
FFT_abs=abs(fft(x));
plot(f,20*log10(FFT_abs/max(FFT_abs)),'linewidth',3,'b+-');
It gives this error:
Error using plot
Data must be a single matrix Y or a list of pairs X,Y.

采纳的回答

KSSV
KSSV 2021-5-3
Use:
plot(f,20*log10(FFT_abs/max(FFT_abs)),'color','b','linewidth',3);

更多回答(3 个)

Stephen
Stephen 2021-5-3
编辑:Stephen 2021-5-3
Exactly as the plot documentation shows, the LineSpec must come directly after the X/Y data:
plot(f,20*log10(FFT_abs/max(FFT_abs)),'b+-','linewidth',3);

Walter Roberson
Walter Roberson 2021-5-3
plot(f,20*log10(FFT_abs/max(FFT_abs)),'b+-','linewidth',3);
Named options must always go after all positional parameters.

Mathieu NOE
Mathieu NOE 2021-5-3
hello
it works better this way :
plot(f,20*log10(FFT_abs/max(FFT_abs)),'b+-','linewidth',3);
  5 个评论
Walter Roberson
Walter Roberson 2021-5-4
KSSV's solution does not set the line style or the marker.

请先登录,再进行评论。

Community Treasure Hunt

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

Start Hunting!

Translated by