apunkt/GPy
1
0
Fork 0
mirror of https://github.com/SheffieldML/GPy.git synced 2026-06-11 15:15:15 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

Changes to symbolic.

Browse source
This commit is contained in:
Neil Lawrence 2013-11-13 07:57:57 +00:00
parent 505e5e9210
commit b502efb1c5
1 changed files with 14 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

15
GPy/util/symbolic.py
View file

@ -1,4 +1,4 @@
from sympy import Function, S, oo, I, cos, sin, asin, log, erf,pi,exp
from sympy import Function, S, oo, I, cos, sin, asin, log, erf,pi,exp, sqrt
class ln_diff_erf(Function):
@ -22,6 +22,19 @@ class ln_diff_erf(Function):
class sim_h(Function):
nargs = 5
def fdiff(self, argindex=5):
t, tprime, d_i, d_j, l = self.args
if argindex == 5:
return -2*sin(t)
elif argindex == 4:
return 2*exp(d_i)
elif argindex == 3:
return 4*exp(d_j)
elif argindex == 2:
return 3*exp(l)
elif argindex == 1:
return 2*d_j
@classmethod
def eval(cls, t, tprime, d_i, d_j, l):
return exp((d_j/2*l)**2)/(d_i+d_j)*(exp(-d_j*(tprime - t))*(erf((tprime-t)/l - d_j/2*l) + erf(t/l + d_j/2*l)) - exp(-(d_j*tprime + d_i))*(erf(tprime/l - d_j/2*l) + erf(d_j/2*l)))