Mean-square error calculation

[simonfoxguitar]

Hi there,
I think the mean-square error calculation might have a problem. It doesn't seem to be accumulating values. That swift syntax is a little unfamiliar to me, so I tried typing it out verbosely:

var errorSum = Float(0)
                for x in 0 ..< real.count {
                    let error = (real[x] - target[x]) * (real[x] - target[x])
                    errorSum += error
                }
                errorSum /= Float(real.count)

... and the result was different.
Hope this helps your project, apologies if I have got it wrong, best wishes,
Simon.