Readme example doesn't work

[pkese]

I'm trying to run the example code in README.md

let f (xs: DT<double>) = 
     sin (v 0.5 * sqr xs.[0] - v 0.25 * sqr xs.[1] + v 3.0) * -cos (v 2.0 * xs.[0] + v 1.0 - exp xs.[1])

and getting

error FS0001: The type 'DT<float>' does not support the operator 'Sin'

[moloneymb]

Thanks Peter for bringing this to our attention. We will clean up the README.md as part of the update to TF.Net 1.14.0. For now it's best to use the tests as a guide.