How to fix problem with subplot and for loop

2023 9 15
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更新时间：2023 9 15
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I'm having trouble plotting with subplot. I've been trying to plot multiple graphs since the variables I'm plotting have multiple outputs but I tried using the comand - subplot(3,2,i5) since im trying to plot 3 rows in two coloums by pulling my info form a for loop. It's giving me a graph but it's also giving me an error "Index exeeds number of subplots". What should I do?
(to solve a little bit of confusion, I'm trying to plot the noise factors + the sine wave to get different snr noise levels)
This is my code:
clear;
clc;
load('ver.mat')
Time_5=0:0.01:5;
f=3;
x_5= sin(2*pi*f*Time_5*6);
Max_diff=length(Time_5);
disp(Max_diff); % length of time vector
501
plot(Time_5,x_5);
title('Signal vs. Time Vector');
ylabel('Signal');
xlabel('Time');
N_fact=0.2:0.6:4; % noise vector
for i5=1:length(N_fact)
noise=rand(size(Time_5))-0.5;
noise_sig= x_5+noise*N_fact(i5);
% for SNR:
sig_pwr=sum(x.^2)/length(x);
noise_pwr=sum((noise_sig-x).^2)/length(x);
snr=10*log10(sig_pwr/noise_pwr);
subplot(3,2,i5);
plot(Time_5,noise_sig);
xlabel('Time in s');
ylabel('Signal');
title(sprintf('SNR=%.2f dB',snr));
end
Unrecognized function or variable 'x'.

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Gabriela
Gabriela 2023-9-15
I forgot to add something. I changed the line
snr=10*log10(sig_pwr/noise_pwr);
for:
snr=snr(x,noise_sig);
I think this one works better...? If not please let me know and thank you for the help!
Torsten
Torsten 2023-9-15
Next error follows.
Please test your code next time by using the green RUN arrow.

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 采纳的回答

Star Strider
Star Strider 2023-9-15
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You are plotting seven subplots so you need to make room for them.
Try this —
clear;
clc;
load('ver.mat')
Time_5=0:0.01:5;
f=3;
x= sin(2*pi*f*Time_5*6);
Max_diff=length(Time_5);
disp(Max_diff); % length of time vector
501
plot(Time_5,x);
title('Signal vs. Time Vector');
ylabel('Signal');
xlabel('Time');
N_fact=0.2:0.6:4; % noise vector
for i5=1:length(N_fact)
noise=rand(size(Time_5))-0.5;
noise_sig= x+noise*N_fact(i5);
% for SNR:
sig_pwr=sum(x.^2)/length(x);
noise_pwr=sum((noise_sig-x).^2)/length(x);
snr=10*log10(sig_pwr/noise_pwr);
subplot(2,4,i5);
plot(Time_5,noise_sig);
xlabel('Time in s');
ylabel('Signal');
title(sprintf('SNR=%.2f dB',snr));
end
.

更多回答（1 个）

Image Analyst
Image Analyst 2023-9-15
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N_fact=0.2:0.6:4
N_fact = 1×7
0.2000 0.8000 1.4000 2.0000 2.6000 3.2000 3.8000
numel(N_fact)
ans = 7
You can see that you need at least 7 plots but with "3,2" you're setting up a layout of only 6 plot slots. To fix, use 3,3 in subplot, not 3,2
subplot(3, 3, i5)

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