Elliptic integrals with mfun

I get a different value when calculating ellipticE directly and with mfun:

>> mfun('EllipticE',0.5)-ellipticE(0.5)

gives: 0.1168.

What am I missing?

I'm using Matlab 8.2.0.701 (R2013b).

Avi

[Avi]

After some more digging I found out that these two functions take slightly different inputs. ellipticE() assumes the input is square, so the following will be zero:

mfun('EllipticE',0.5)-ellipticE(0.5^2)

Case closed!

[the cyclist]

I suggest you create an answer here instead of a comment, accept that answer, and delete the comment.