For loop for different step size

Dear Matlab Community,

I have a matrix like

[24 80; 24 80; 24 80; 24 80; 30 120; 30 120; 48 124; 48 124; 48 124]

I need to have a plot that 80, 120, 124 be in the x axis and the numbers 4,2,3 be in the y axis.

We have 4 of 24, 3 of 30 and 3 of 48.

Thanks :)))

Answer 1

[Voss]

M = [24 80; 24 80; 24 80; 24 80; 30 120; 30 120; 48 124; 48 124; 48 124];
[c,g] = groupcounts(M(:,2))

c = 3×1

4 2 3

<mw-icon class=""></mw-icon>

<mw-icon class=""></mw-icon>

g = 3×1

80 120 124

<mw-icon class=""></mw-icon>

<mw-icon class=""></mw-icon>

There are your y- and x-axis numbers.

Perhaps one of these plots is what you mean:

x = 1:numel(g);

figure('Position',[10 10 1000 400])
tiledlayout(2,2)

nexttile
plot(g,c)

nexttile
bar(g,c)

nexttile
plot(x,c)
xticks(x)
xticklabels(g)

nexttile
bar(x,c)
xticks(x)
xticklabels(g)

[Neda]

Thank you Voss,

I did not know about groupcount. What is the meaning of M(:,2) in this command? I know M(:,2), but what is it role in groupcount?

[Voss]

M(:,2) is the second column of M. The code passes the second column of M to groupcounts().

https://www.mathworks.com/help/matlab/ref/double.groupcounts.html

[Neda]

Thank you so much !!!!

[Voss]

You're welcome!