Plot vectors in cell array over for loop

I have the following data structure (a cell array populated with vectors):

sigvecarray = {};
freqarray = {};

% Reading the audio files, getting the signal vector and the corresponding 
for k = 1:numel(inputarray) % indices
    curr_input = inputarray{k};
    [y, Fs] = audioread(curr_input);
    sigvecarray{k} = y;
    freqarray{k} = Fs;
end

I'm trying to plot them over a for loop by using the following:

for k = 1:numel(sigvecarray)
    plot(sigvecarray{k})
end

But I get only the fist vector plotted as my output. What could I be doing wrong here? Is it because the cell array is a row vector? If yes, how do I convert the cell array to a column vector from a row vector?

Answer 1

[KSSV]

figure
hold on
for k = 1:numel(sigvecarray)
    plot(sigvecarray{k})
end

[skrowten_hermit]

Okay. This seems to be plotting them but on top of each. Should I use subplots then?

[skrowten_hermit]

Okay. A bit of playing around and the following plotted each of the vectors just fine:

for k = 1:numel(sigvecarray)
    figure;
    hold on;
    plot(sigvecarray{k})
end

Thanks for the pointers.

[KSSV]

Yes, you can use subplot if you want it on different plots. You can use subplot in a loop depending on how many plots are there.

k = 5;
for i = 1:k
  subplot(k,1,i)
  plot(rand(1,10))
end

[skrowten_hermit]

I had tried out subplots before. They seem to shrink the plots to fit the screen when I do:

for k = 1:numel(sigvecarray)
    subplot(length(sigvecarray), 1, k)
    plot(sigvecarray{k})
end

Is there a way to decide the size (in pixels for example) of each plot? Say 640x480 or something like that?

[KSSV]

Possible you need to set the size of whole figure etc....read the doc.

Answer 2

[Ameer Hamza]

Read about hold function(): https://www.mathworks.com/help/matlab/ref/hold.html.

hold on

will add new lines on the same axes without deleting old lines.

Also see subplot(): https://www.mathworks.com/help/matlab/ref/subplot.html

[skrowten_hermit]

Hi Ameer,

I had tried out subplots before. They seem to shrink the plots to fit the screen when I do:

for k = 1:numel(sigvecarray)
    subplot(length(sigvecarray), 1, k)
    plot(sigvecarray{k})
end

Is there a way to decide the size (in pixels for example) of each plot. The help page you shared didn't seem to have that option.

[Ameer Hamza]

You need to use the Position property of the axes object to change their size. An alternative might be to use

nexttile(): https://www.mathworks.com/help/matlab/ref/nexttile.html. Though I am not sure if there is a significant difference.

[skrowten_hermit]

Thanks. Looks promising. I'll definitely try nexttile().