Mercurial > octave-nkf
diff scripts/statistics/distributions/betainv.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 | c792872f8942 |
children | 72c96de7a403 |
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--- a/scripts/statistics/distributions/betainv.m Tue Sep 20 11:41:59 2011 -0700 +++ b/scripts/statistics/distributions/betainv.m Tue Sep 20 12:13:13 2011 -0700 @@ -1,3 +1,4 @@ +## Copyright (C) 2011 Rik Wehbring ## Copyright (C) 1995-2011 Kurt Hornik ## ## This file is part of Octave. @@ -18,7 +19,7 @@ ## -*- texinfo -*- ## @deftypefn {Function File} {} betainv (@var{x}, @var{a}, @var{b}) -## For each component of @var{x}, compute the quantile (the inverse of +## For each element of @var{x}, compute the quantile (the inverse of ## the CDF) at @var{x} of the Beta distribution with parameters @var{a} ## and @var{b}. ## @end deftypefn @@ -32,36 +33,39 @@ print_usage (); endif - if (!isscalar (a) || !isscalar(b)) + if (!isscalar (a) || !isscalar (b)) [retval, x, a, b] = common_size (x, a, b); if (retval > 0) - error ("betainv: X, A and B must be of common size or scalars"); + error ("betainv: X, A, and B must be of common size or scalars"); endif endif - sz = size (x); - inv = zeros (sz); - - k = find ((x < 0) | (x > 1) | !(a > 0) | !(b > 0) | isnan (x)); - if (any (k)) - inv (k) = NaN; + if (iscomplex (x) || iscomplex (a) || iscomplex (b)) + error ("betainv: X, A, and B must not be complex"); endif - k = find ((x == 1) & (a > 0) & (b > 0)); - if (any (k)) - inv (k) = 1; + if (isa (x, "single") || isa (a, "single") || isa (b, "single")) + inv = zeros (size (x), "single"); + else + inv = zeros (size (x)); endif + k = (x < 0) | (x > 1) | !(a > 0) | !(b > 0) | isnan (x); + inv(k) = NaN; + + k = (x == 1) & (a > 0) & (b > 0); + inv(k) = 1; + k = find ((x > 0) & (x < 1) & (a > 0) & (b > 0)); if (any (k)) - if (!isscalar(a) || !isscalar(b)) - a = a (k); - b = b (k); + if (!isscalar (a) || !isscalar (b)) + a = a(k); + b = b(k); y = a ./ (a + b); else y = a / (a + b) * ones (size (k)); endif - x = x (k); + x = x(k); if (isa (y, "single")) myeps = eps ("single"); @@ -97,7 +101,36 @@ y_old = y_new; endfor - inv (k) = y_new; + inv(k) = y_new; endif endfunction + + +%!shared x +%! x = [-1 0 0.75 1 2]; +%!assert(betainv (x, ones(1,5), 2*ones(1,5)), [NaN 0 0.5 1 NaN]); +%!assert(betainv (x, 1, 2*ones(1,5)), [NaN 0 0.5 1 NaN]); +%!assert(betainv (x, ones(1,5), 2), [NaN 0 0.5 1 NaN]); +%!assert(betainv (x, [1 0 NaN 1 1], 2), [NaN NaN NaN 1 NaN]); +%!assert(betainv (x, 1, 2*[1 0 NaN 1 1]), [NaN NaN NaN 1 NaN]); +%!assert(betainv ([x(1:2) NaN x(4:5)], 1, 2), [NaN 0 NaN 1 NaN]); + +%% Test class of input preserved +%!assert(betainv ([x, NaN], 1, 2), [NaN 0 0.5 1 NaN NaN]); +%!assert(betainv (single([x, NaN]), 1, 2), single([NaN 0 0.5 1 NaN NaN])); +%!assert(betainv ([x, NaN], single(1), 2), single([NaN 0 0.5 1 NaN NaN])); +%!assert(betainv ([x, NaN], 1, single(2)), single([NaN 0 0.5 1 NaN NaN])); + +%% Test input validation +%!error betainv () +%!error betainv (1) +%!error betainv (1,2) +%!error betainv (1,2,3,4) +%!error betainv (ones(3),ones(2),ones(2)) +%!error betainv (ones(2),ones(3),ones(2)) +%!error betainv (ones(2),ones(2),ones(3)) +%!error betainv (i, 2, 2) +%!error betainv (2, i, 2) +%!error betainv (2, 2, i) +