MATLAB: Histogram of a m-by-n matrix

histogrammatrix

I have a m-by-n matrix of values between 10^-20 and 10^-8 I drew it by

hist(My_mat(:),15);

I obtain only one big bin of the hist, instead I would like to get several of bins between min and max values. Is it correct my code above ? Do you have any suggestions?

Best Answer

I would do one of two approaches, depending on what your data distribution is:

Increase the number of bins, perhaps from 25 to 100 depending on what you want to do;
Take log10(X) and use that instead.

The first is probably the easiest. Experiment until you get the result you want.

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MATLAB: How to format the axis of the plot

%OPTION 1: Overwrite the XTickLabel property of the axes. (Simpler code but messy plot)
plot([1:10]*10^6, 1:10)
XTick = num2cell(get(gca, 'XTick'));
XTickLabel = cellfun(@(x) sprintf('%0.0f', x), XTick, 'unif', false);
set(gca, 'XTickLabel', XTickLabel, 'XTickLabelRotation', 90)
%OPTION 2: Determine what power was used, then adjust the x-axis name and XTickLabel. (Cleaner plot)
plot([1:10]*10^6, 1:10)
XTick = get(gca, 'XTick');
XTickLabel = get(gca, 'XTickLabel');
XTickLabelNum = str2double(XTickLabel{end});
Power = log10(XTick(end)/XTickLabelNum);
if Power ~= 0
  xlabel(sprintf('X TEXT (x 10^{%d})', Power))
else
  xlabel('X TEXT')
end
set(gca, 'XTickLabel', XTickLabel)

MATLAB: How to plot a histogram with a logarithmic X-axis

The ability to directly plot a histogram with a logarithmic x-axis is not available in MATLAB.

To work around this issue, use the HIST function to plot the histogram, and them use

set(gca,'xscale','log')

to set the x-axis scale to logarithmic.

Best Answer

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MATLAB: How to format the axis of the plot

MATLAB: How to plot a histogram with a logarithmic X-axis

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