Mercurial > octave-nkf
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> |
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date | Tue, 20 Sep 2011 12:13:13 -0700 |
parents | fd0a3ac60b0e |
children | 72c96de7a403 |
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13169:078729410a0d | 13171:19b9f17d22af |
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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 |