Invert a histogram by emphasizing on the valleys
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Hello! I have a regular histogram, where I have my peaks at a certain frequencies. However, i want to emphasize on the valleys in my histogram rather than on the peaks. How do I make it so? I want my new histogram to display the peaks as the spaces with the biggest valleys in the initial plot. Like invert it, in a sense?
7 Comments
Image Analyst
on 20 Aug 2021
@kathsb, what picture? I'm not seeing any picture that you uploaded or butchered. Did you remove it?
And do you just want to somehow invert the bar chart, or do you actually want to change the original data from which it came?
And why? What is the use case? It seems like the result could be misleading. Why would you want to do that?
You already accepted an answer below, so we assume you've already solved the problem so not sure why you're continuing to post.
Accepted Answer
Yazan
on 20 Aug 2021
Edited: Yazan
on 20 Aug 2021
One way to do that probably is by subtracting the rate in each bin from the maximum rate. Below is an example with normal distribution. I'm not sure though if interpreting this result is very meaningful.
clc, clear
x = randn(1, 1000);
h1 = histcounts(x);
h2 = max(h1)-h1;
bar(h1, 'FaceAlpha', 0.5), hold on, bar(h2, 'r', 'FaceAlpha', 0.5);
2 Comments
Steven Lord
on 20 Aug 2021
Instead of using bar you could use the output from histcounts as the BinEdges and BinCounts in a call to histogram.
x = randn(1, 1e5);
[counts, edges] = histcounts(x);
histogram('BinEdges', edges, 'BinCounts', max(counts)-counts)
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