# MATLAB: How to clear “last warning”

"if warning" return

Hi!
SHORT QUESTION: I would like to clear the value "lastwarn" in a nice way so that I can create loops.
BACKGROUND: I want to count the number of warnings " Matrix is singular to working precision." that Matlab generates. I have read http://www.mathworks.com/matlabcentral/answers/32348-using-if-warning-as-a-conditional-statement But it does not say how to clear the last warning. Currently I am creating a new warning for this purpose (see the following code). Does anybody know a better solution?
vector_input=[0 1 0]';vector_output= -100*ones(size(vector_input));number_warnings=0;for k=1:size(vector_input,1)%      warning on MATLAB:nearlySingularMatrix;    vector_output(k)=inv( vector_input(k));    [msglast, msgidlast] = lastwarn;   if strcmp(msgidlast,'MATLAB:singularMatrix')        number_warnings=number_warnings+1;    end    s = warning('off','all'); % turn display of all warnings off    warning('FineId','fine') % becomes the last warning    warning(s) % turn display of all warnings onend