Replace a scaler with NaN

I have a 41x5x2001 matrix (E) with the value -9.96921e+36 scattered throughout. I would like to replace this with NaN. I tried the code below, which has worked for me when replacing zeros with NaN, but it isn't working now. What am I doing wrong?

E(E==-9.96921*10^(36))=nan;

or 

E(E==-9.96921e36) = nan

Answer 1

[Fangjun Jiang]

https://www.mathworks.com/matlabcentral/answers/57444-faq-why-is-0-3-0-2-0-1-not-equal-to-zero