Mercurial > forge
changeset 10734:2c4c68921976 octave-forge
xcorr2: fix bug when no arguments are passed
author | carandraug |
---|---|
date | Mon, 27 Aug 2012 01:51:54 +0000 |
parents | 43748916cab9 |
children | dc845950dc0f |
files | main/signal/inst/xcorr2.m |
diffstat | 1 files changed, 8 insertions(+), 3 deletions(-) [+] |
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--- a/main/signal/inst/xcorr2.m Sun Aug 26 19:32:20 2012 +0000 +++ b/main/signal/inst/xcorr2.m Mon Aug 27 01:51:54 2012 +0000 @@ -21,8 +21,8 @@ ## @deftypefnx {Function File} {@var{c} =} xcorr2 (@dots{}, @var{scale}) ## Compute the 2D cross-correlation of matrices @var{a} and @var{b}. ## -## If @var{b} is not specified, it defaults to the same matrix as @var{a}, i.e., -## same as @code{xcorr(@var{a}, @var{a})}. +## If @var{b} is not specified, computes autocorrelation of @var{a}, i.e., +## same as @code{xcorr (@var{a}, @var{a})}. ## ## The optional argument @var{scale}, defines the type of scaling applied to the ## cross-correlation matrix. Possible values are: @@ -51,13 +51,18 @@ ## @seealso{conv2, corr2, xcorr} ## @end deftypefn -function c = xcorr2 (a, b = a, biasflag = "none") +function c = xcorr2 (a, b, biasflag = "none") if (nargin < 1 || nargin > 3) print_usage; elseif (nargin == 2 && ischar (b)) biasflag = b; b = a; + elseif (nargin == 1) + ## we have to set this case here instead of the function line, because if + ## someone calls the function with zero argument, since a is never set, we + ## will fail with "`a' undefined" error rather that print_usage + b = a; endif ## compute correlation