Thanks Star Strider and MathsReallyWork. I kind of figure it out.Ans: [5;2;1;3]
dmax=3
Nrows=4
A=[5 7 8 3 2 ;6 2 1 4 4;1 2 3 4 5; 4 5 2 1 3]
for i=1:Nrows
B=A(i,:)';
a(i)=find(B<dmax,1,'first') ;
end
b=a'
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