mirror-github-bspeice/cuburn
1
0
Fork 0
mirror of https://github.com/stevenrobertson/cuburn.git synced 2025-02-05 11:40:04 -05:00
Code Issues Actions Packages Projects Releases Wiki Activity

Fix spline derivative calculation.

Browse Source
This commit is contained in:
Steven Robertson 2011-10-29 10:51:33 -04:00
parent bfff915b7e
commit 6204f36ebc
1 changed files with 14 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
cuburn/genome.py
View File

@ -39,34 +39,35 @@ class SplEval(object):
# Normalize to [0,1]
t = itime - times[1]
times = times - times[1]
t = t / times[2]
times = times / times[2]
return times, vals, t
scale = 1 / times[2]
t = t * scale
times = times * scale
return times, vals, t, scale
def __call__(self, itime, deriv=0):
times, vals, t = self.find_knots(itime)
times, vals, t, scale = self.find_knots(itime)
m1 = (vals[2] - vals[0]) / (1.0 - times[0])
m2 = (vals[3] - vals[1]) / times[3]
mat = self._mat
if deriv:
mat = mat * self._deriv ** (deriv)
mat = mat * (scale * self._deriv) ** deriv
val = [m1, vals[1], m2, vals[2]] * mat * np.array([[t**3, t**2, t, 1]]).T
return val[0,0]
def _plt(self, name='SplEval'):
def _plt(self, name='SplEval', fig=111, show=True):
import matplotlib.pyplot as plt
x = np.linspace(-0.05, 1.05, 500)
x = np.linspace(-0.0, 1.0, 500)
r = x[1] - x[0]
derivs = [(self(i+2*r)-self(i-2*r))/(4*r) for i in x]
plt.figure(1)
plt.figure(fig)
plt.title(name)
plt.plot(x,map(self,x),x,[self(i,1) for i in x],'--',x,derivs,'r.')
plt.plot(x,map(self,x),x,[self(i,1) for i in x],'--',
self.knots[0],self.knots[1],'x')
plt.xlim(0.0, 1.0)
if show:
plt.show()
def __str__(self):
return '[%g:%g]' % (self(0), self(1))
def __repr__(self):