30 lines
945 B
Matlab
30 lines
945 B
Matlab
function [pdf, centers] = isihist(isis, binwidth)
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% Compute normalized histogram of interspike intervals.
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%
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% [pdf, centers] = isihist(isis, binwidth)
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%
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% Arguments:
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% isis: vector of interspike intervals in seconds
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% binwidth: optional width in seconds to be used for the isi bins
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%
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% Returns:
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% pdf: vector with pdf of interspike intervals in Hertz
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% centers: vector with centers of interspikeintervalls in seconds
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if nargin < 2
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% compute good binwidth:
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nperbin = 200; % average number of data points per bin
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bins = length(isis)/nperbin; % number of bins
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binwidth = max(isis)/bins;
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if binwidth < 5e-4 % half a millisecond
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binwidth = 5e-4;
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end
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end
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bins = 0.5*binwidth:binwidth:max(isis);
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% histogram data:
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[nelements, centers] = hist(isis, bins);
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% normalization (integral = 1):
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pdf = nelements / sum(nelements) / binwidth;
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end
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