If A is your matrix:
A(find(A(:,10)==0.03,1),10);
You might need to be careful about getting an exact match with the floating-point value 0.03, and use some kind of tolerance instead.
For example:
A(find(A(:,10)>(0.03-1.e-9) & A(:,10)<(0.03+1.e-9),1),10);
Take a look at this documentation for eps (floating point relative accuracy) if you need to be more precise.
