Tell probfit to use my analytical integral¶
probfit checks for a method
integrate(bound, nint, *arg).
If such method is available it calls that method to compute definite integral.
If not it falls back to simpson3/8 integration (cubic approximation).
from probfit import integrate1d def line(x, m, c): return m*x+c # compute integral of line from x=(0,1) using 10 intevals with m=1. and c=2. # all probfit internal use this # no integrate method available probfit use simpson3/8 print integrate1d(line, (0,1), 10, (1.,2.) ) # Let us illustrate the point by forcing it to have integral that's off by # factor of two def wrong_line_integral(bound, nint, m, c): a, b = bound return 2*(m*(b**2/2.-a**2/2.)+c*(b-a)) # I know this is wrong line.integrate = wrong_line_integral # line.integrate = lambda bound, nint, m, c: blah blah # this works too # yes off by factor of two print integrate1d(line, (0,1), 10, (1.,2.))