Fix bug in obsFilt.m to allow for negative values in the source strength PSD...

Fix bug in obsFilt.m to allow for negative values in the source strength PSD matrix so that complex numbers can be used

Virtual Sensing/Remote Microphone Technique/MATLAB/Functions/obsFilt.m

@@ -3,7 +3,7 @@
 % Author: Achilles Kappis
 % e-mail: axilleaz@protonmail.com
 %
-% Date: 01/09/2024 (DD/MM/YYYY)
+% Date: 04/09/2024 (DD/MM/YYYY)
 %
 % Copyright: MIT
 % --------------------------------------------------
@@ -91,7 +91,12 @@ function [oOpt, Sme, Smm, condNum] = obsFilt(Pe, Pm, srcCsd, regFacs, snrVal)
 
     % Validate optional arguments
     if nargin > 2 && ~isempty(srcCsd)
-        validateattributes(srcCsd, "numeric", {'2d', 'nonnegative', 'nonnan', 'finite'}, mfilename, "Source cross spectral density matrix", 3)
+        validateattributes(srcCsd, "numeric", {'2d', 'nonnan', 'finite'}, mfilename, "Source cross spectral density matrix", 3)
+
+        % Check for correct dimensions
+        if diff(size(srcCsd))
+            error("The source power spectral density matrix must be a square matrix");
+        end
     else
         srcCsd = eye(size(Pe, 2));
     end