MATLAB: Changing scale of x-axis in histfit

histfitscaling

Hi!

I am generating some histograms with a normal distribution using histfit, and I need to change the scale in the x-axis. Specifically, I get 3 histograms for three different possible outcomes, and I need the scale on all of them to be the same in the x-axis.

Thanks!

Best Answer

I am not certain what you’re doing, but I would consider using the hold function.

For example:

D1 = randn(1,100);                  % Create Data For Distributions
D2 = 2+1.5*randn(1,100);
D3 = 3+0.5*randn(1,100);
figure(1)                           % Plot All ‘histift’s On The Same Axes 
histfit(D1)
hold on
histfit(D2)
histfit(D3)
hold off
grid

Is this what you want to do?

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Here is one way to use regular-width bins spaced logarithmically:

x = 10+2*randn(1, 100);                 % Create data
bins = linspace(floor(min(x)), ceil(max(x)), 25);   % Define bins
xc = histc(x,bins);                     % Do histogram counts
figure(1)
bar(log(bins), xc)                      % Plot bars against log of ‘bins’
logxts = get(gca, 'XTick')              % 'XTick' values currently logarithmic
expxts = exp(logxts);                   % Take antilog to use them as new ‘XTickLabels’
set(gca, 'XTickLabel', floor(100*expxts)/100)

The plot:

This produces logarithmic X-axis values (scaling and labels) for the bar plot. If you want to experiment with other transformations, be sure you can uniquely inverse-transform them to get the X-axis labels.

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One line:

set(gca, 'XLim', [0, get(gca, 'XLim') * [0; 1]])

Or without assuming that the lower limit is 0:

set(gca, 'XLim', get(gca, 'XLim') .* [0, 1] + [lowLimit, 0])

But your three lines are easier to read and faster to debug.

Best Answer

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