comparison scripts/statistics/distributions/laplace_pdf.m @ 13171:19b9f17d22af

Overhaul of statistical distribution functions Support class "single" 75% reduction in memory usage More Matlab compatibility for corner cases * betacdf.m, betainv.m, betapdf.m, betarnd.m, binocdf.m, binoinv.m, binopdf.m, binornd.m, cauchy_cdf.m, cauchy_inv.m, cauchy_pdf.m, cauchy_rnd.m, chi2cdf.m, chi2inv.m, chi2pdf.m, chi2rnd.m, discrete_cdf.m, discrete_inv.m, discrete_pdf.m, discrete_rnd.m, empirical_cdf.m, empirical_inv.m, empirical_pdf.m, empirical_rnd.m, expcdf.m, expinv.m, exppdf.m, exprnd.m, fcdf.m, finv.m, fpdf.m, frnd.m, gamcdf.m, gaminv.m, gampdf.m, gamrnd.m, geocdf.m, geoinv.m, geopdf.m, geornd.m, hygecdf.m, hygeinv.m, hygepdf.m, hygernd.m, kolmogorov_smirnov_cdf.m, laplace_cdf.m, laplace_inv.m, laplace_pdf.m, laplace_rnd.m, logistic_cdf.m, logistic_inv.m, logistic_pdf.m, logistic_rnd.m, logncdf.m, logninv.m, lognpdf.m, lognrnd.m, nbincdf.m, nbininv.m, nbinpdf.m, nbinrnd.m, normcdf.m, norminv.m, normpdf.m, normrnd.m, poisscdf.m, poissinv.m, poisspdf.m, poissrnd.m, stdnormal_cdf.m, stdnormal_inv.m, stdnormal_pdf.m, stdnormal_rnd.m, tcdf.m, tinv.m, tpdf.m, trnd.m, unidcdf.m, unidinv.m, unidpdf.m, unidrnd.m, unifcdf.m, unifinv.m, unifpdf.m, unifrnd.m, wblcdf.m, wblinv.m, wblpdf.m, wblrnd.m: Return "single" outputs for "single" inputs, Use logical indexing rather than find() for 75% memory savings, Add tests for all functions, Use consistent documentation across all functions, More Matlab compatibilitcy for corner cases.
author Rik <octave@nomad.inbox5.com>
date Tue, 20 Sep 2011 12:13:13 -0700
parents fd0a3ac60b0e
children 72c96de7a403
comparison
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13169:078729410a0d 13171:19b9f17d22af
1 ## Copyright (C) 2011 Rik Wehbring
1 ## Copyright (C) 1995-2011 Kurt Hornik 2 ## Copyright (C) 1995-2011 Kurt Hornik
2 ## 3 ##
3 ## This file is part of Octave. 4 ## This file is part of Octave.
4 ## 5 ##
5 ## Octave is free software; you can redistribute it and/or modify it 6 ## Octave is free software; you can redistribute it and/or modify it
28 function pdf = laplace_pdf (x) 29 function pdf = laplace_pdf (x)
29 30
30 if (nargin != 1) 31 if (nargin != 1)
31 print_usage (); 32 print_usage ();
32 endif 33 endif
33 34
34 pdf = zeros (size (x)); 35 if (iscomplex (x))
35 36 error ("laplace_pdf: X must not be complex");
36 k = find (isnan (x));
37 if (any (k))
38 pdf(k) = NaN;
39 endif 37 endif
40 38
41 k = find ((x > -Inf) & (x < Inf)); 39 pdf = exp (- abs (x)) / 2;
42 if (any (k))
43 pdf(k) = exp (- abs (x(k))) / 2;
44 endif
45 40
46 endfunction 41 endfunction
42
43
44 %!shared x,y
45 %! x = [-Inf -log(2) 0 log(2) Inf];
46 %! y = [0, 1/4, 1/2, 1/4, 0];
47 %!assert(laplace_pdf ([x, NaN]), [y, NaN]);
48
49 %% Test class of input preserved
50 %!assert(laplace_pdf (single([x, NaN])), single([y, NaN]));
51
52 %% Test input validation
53 %!error laplace_pdf ()
54 %!error laplace_pdf (1,2)
55 %!error laplace_pdf (i)
56