Somatic Post Synaptic Current (Dpsc) calculation function

Need some help currently on interpreting how to code 'K' from the
following Mathematica 'out' formula: http://i.imgur.com/Tfa14od.jpg
appears to be this function http://mathworld.wolfram.com/K-Function.html
Trying to figure out how can that be coded in Matlab?
I am also still working on getting the integral function to work.