How to fix problem with subplot and for loop

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'.

[Gabriela]

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]

Next error follows.

Please test your code next time by using the green RUN arrow.

Answer 1

[Star Strider]

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

.

Answer 2

[Image Analyst]

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)