# Histogram distribution with two vectors

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Naser Khan on 4 Jul 2022
Edited: Torsten on 5 Jul 2022
Hi there,
I have two separate vectors, one for vehicle power and another one for vehicle speed. I am trying to have a histogram to show a power vs speed distribution. I have attached an image to assist with understanding.
Thanks,
Torsten on 5 Jul 2022
Edited: Torsten on 5 Jul 2022
And what is the solid line in the graph ? Is it a kind of regression line approximating the speed/frequency relationship ?

Image Analyst on 4 Jul 2022
Since you say "I have two vectors for the two axes. I am essentially looking to have the frequency (y-axis) of the power at different speed (x-axis). The speeds can be spaced out in steps of 5 or 10."
then your y vector is already the frequency (histogram) so no need to call histogram() because you've already done that. The histogram function can do the plotting for you, or if you'd rather plot the frequency as bars like your graphic showed, then you can use bar
bar(speedVector, frequencyVector);
grid on;
##### 2 CommentsShowHide 1 older comment
Image Analyst on 4 Jul 2022
Sure, when you got your y values (counts in each hisotgram bin), you could specify the bin edges if you wish.
% Specify which x values should be grouped into each bin
% by definining the edges (dividing lines) between bins.
edges = [-inf, 0:20:100, inf];
% Get the y values which is the frequency (count)
% of how many data points are in each bin.
[counts, edges] = histcounts(data, edges);
bar(edges(1:end-1), counts);
grid on;

R2021b

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