index exceeds the number of subplots

clc;clear; 
f = zeros(13,1); 
f(1) = 440; 
k = 2^(1/12); 

for n = 1:12 f(n+1) = k*f(n); 
    
end 

%disp(f) 

f_do = f(4); 
f_re = f(6); 
f_mi = f(8); 
f_fa = f(10);
f_so = f(12);
F_s = 16000; 
t = 0:1/F_s:1-1/F_s; 

do = sin(2*pi*f_do*t); 
re = sin(2*pi*f_re*t); 
mi = sin(2*pi*f_mi*t);
fa = sin(2*pi*f_fa*t);
so = sin(2*pi*f_so*t);

doremifaso = [do re mi fa so]; 

subplot(311)
plot(t,do,'r') 
xlim([0 0.01]) 
ylim([-2 2]) 

subplot(312) 
plot(t,re,'b') 
xlim([0 0.01]) 
ylim([-2 2]) 

subplot(313) 
plot(t,mi,'g') 
xlim([0 0.01]) 
ylim([-2 2]) 

subplot(314) 
plot(t,fa,e’) 
xlim([0 0.01]) 
ylim([-2 2]) 

subplot(315) 
plot(t,so,’s’) 
xlim([0 0.01]) 
ylim([-2 2]) 

soundsc(doremifaso,F_s)

I am trying to write a code that plays the sound of doremifaso. When I plug in this code it says that the "index exceeds the number of subplots" can someone tell me what I am doing wrong

[Abderrahim. B]

The first subplot(3,1,1) devided the current figure into 3 rows and 1 column and you are trying to plot in rows 4 and 5 that they don't exist.

Try this:

f = zeros(13,1); 
f(1) = 440; 
k = 2^(1/12); 

for n = 1:12 
    f(n+1) = k*f(n);   
end 

%disp(f) 

f_do = f(4); 
f_re = f(6); 
f_mi = f(8); 
f_fa = f(10);
f_so = f(12);
F_s = 16000; 
t = 0:1/F_s:1-1/F_s; 

do = sin(2*pi*f_do*t); 
re = sin(2*pi*f_re*t); 
mi = sin(2*pi*f_mi*t);
fa = sin(2*pi*f_fa*t);
so = sin(2*pi*f_so*t);

doremifaso = [do re mi fa so]; 

subplot(511)
plot(t,do,'r') 
xlim([0 0.01]) 
ylim([-2 2]) 

subplot(512) 
plot(t,re,'b') 
xlim([0 0.01]) 
ylim([-2 2]) 

subplot(513) 
plot(t,mi,'g') 
xlim([0 0.01]) 
ylim([-2 2]) 

subplot(514) 
plot(t,fa,'k') 
xlim([0 0.01]) 
ylim([-2 2]) 

subplot(515) 
plot(t,so,'s') 
xlim([0 0.01]) 
ylim([-2 2]) 

soundsc(doremifaso,F_s)

[Helal Alkhyeli]

Thanks. I have managed to make it work. I have another question if I may ask, how can I write an FFT analysis for the above wave (do re mi) functions.

Answer 1

[Walter Roberson]

subplot(315) 

In the 315, the leading 3 indicates that you want to create an array of plots that has three plots tall. The 1 after that indicates that you want the array of plots to be 1 plot wide. Those two digits together say that you want a 3 x 1 array of plots.

The third digit after that indicates which of the (3 x 1) array you want to select. The plots are numbered top to bottom, left to right, so you start from the top left, move to the right through all the defined columns, then move down to the next row and do that row, and so on. For example if you had a 3 x 2 array of plots, the numbering would be

1 2
3 4
5 6

So with your 3 x 1 array of plots, then numbering of the plots is

1
2
3

That 5 as the third digit says that you want to select the 5th of those plots. But that is a problem, since there are only 3 plot slots defined.

Answer 2

[Helal Alkhyeli]

if i change the subplot to (515) does that solve the problem

[Walter Roberson]

You will need to change all of the '31' to '51' -- 311, 312, 313, 314, 315

[Helal Alkhyeli]

Thanks. I have managed to do it. I have another question, how can write an FFT analysis for the above wave (do re mi) functions.

[Walter Roberson]

I suggest you look at the first example in the fft() documentation