In the body of a program I'm using as reference, this if statement is provided:
dp=max(max(abs(phi1a-phi1))); if(~(dp>0) & ~(dp<0) ) disp('NaN'); return; end if(dp<1d-4) break; end % THIS LINE
where variable 'dp' is defined as so, and phi1a and ph1 are NxN matrices. What I don't understand is the second if condition – does this mean 10^-4? If so why is 'd' used, instead of 'e' as is usually.
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