Using Histogram to create a figure with multiple data sets

Hello! I'm new to MATLAB and am learning how to plot data. I have data stored in multiple double arrays. I am trying to plot them all in a histogram, where each bin can store the values in that range from the multiple doubles. My issue that i am having is that the code below overlays multiple histograms over top of each other rather than group them into one histogram. I hope this makes sense. I appreciate any help.

What I have so far is this (after I have imported my data, i'll skip that section)

figure(1);
a = Initial(1).red;
b = Initial(1).green;
c = Initial(2).red;
d = Initial(2).green;
e = Initial(4).red;
f = Initial(4).green;
NumBins = 20;
histogram(a/b,NumBins,'FaceColor','black'); hold on
histogram(c/d,NumBins,'FaceColor','black');
histogram(e/f,NumBins,'FaceColor','black')
ylim([0 20]);
set(gca, 'XScale', 'log');

[Image Analyst]

What is a, etc.? Scalars, Matrices, ????

What is a/b? If they're vectors or Matrices you might want to use a./b to do an element by element divide.

Not sure what you want. Do you want a single histogram (bar chart) with counts from a-f all grouped into a single set of bins?

[Michelle Jackson]

a, b, etc are all double arrays. I'm dividing them then taking that answer to be plotted in a histogram. For example, I want to know how frequently 1.5 is across all my arrays. That's why I'm looking to use a histogram. But my issue is, the function histogram doesn't plot them together in bins, it plots them as seperate histograms on one plot. (multiple different colors bar graphs overlapping eachother rather than one bar graph) Does that make more sense?

[Image Analyst]

Make sure you're using the right division. I think you are not. Run this:

format short g
m1 = rand(4, 9);
m2 = rand(4, 9);
div1 = m1 ./ m2 % Element by element divide
div2 = m1 / m2 % Matrix divide (multiply by invers matrix).

What do you observe?

You should be able to get all in one histogram if they are all the same size like

histogram([a(:), b(:), c(:), d(:), e(:), f(:)]);

[Michelle Jackson]

Oh wow okay thank you I see, yes I wasn't using the divide function correctly. I tried out that method but now I'm getting the error "Error using horzcat. Dimensions of arrays being concatenated are not consistent." I should add that the arrays are not the same length (a divided by b is 25x1 double and c divided by d is 29x1 double) is that the issue?

Answer 1

[the cyclist]

One possibility would be to use histcounts to get the bin counts (instead of histogram to plot the bins directly), and then a stacked or grouped bar chart for the plotting of those counts.

[Michelle Jackson]

Thank you, I guess I could use histcounts and then use the bar function to plot them on top of eachother in each bin. I was just hoping there was an easy fix using histogram!