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Hi, 
"Brendan " <c_uboid88@hotmail.co.uk> wrote in message <hpib30$9s4$1@fred.mathworks.com>... 
Sorry, I just meant that the columns of Y contain 1110 elements. i.e It is an array with 4 colums and 1110 rows. Does that not make sense? 
"Brendan " <c_uboid88@hotmail.co.uk> wrote in message <hpicc5$64$1@fred.mathworks.com>... 
y0 = [1;0;0;1]; 
"Brendan " <c_uboid88@hotmail.co.uk> wrote in message <hpib30$9s4$1@fred.mathworks.com>... 
find(atan2(Y(:,2),Y(:,1))==somevalue) 
"Matt Fig" <spamanon@yahoo.com> wrote in message <hpie5o$q7g$1@fred.mathworks.com>... 
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