Hi,
I need to perform cubic spline interpolation of a dataset. I am using
scipy. When I pass two arrays (x,y) to the
interpolate.spl rep(x,y) function I get the following traceback
Traceback (most recent call last):
File "./optmat.py", line 138, in ?
initspline = interpol.getspl ine(initkeys,in ittable)
File "./optmat.py", line 77, in getspline
tck = interpolate.spl rep(self.x,self .y)
File "/usr/lib/python2.3/site-packages/scipy/interpolate/fitpack.py",
line 339, in splrep
t,c,o = _fitpack._curfi t(x,y,w,xb,xe,k ,task,s,t,nest, wrk,iwrk,per)
TypeError: Array can not be safely cast to required type
My understanding is that this problem arises because the "y" array
contains complex numbers and the splrep is trying to cast both arrays to
the same type. Is there a way around this? My data looks like this:
x:
[292.41566910377 401, 300.93263033980 6, 310.73745288220 601,
320.37272273901 8, 331.50867299465 199, 342.49791077348 101,
354.24069628571 402, 367.90576765578 601, 381.48998061538 498,
397.38539647435 903, 413.28081233333 302, 430.50084618055 598,
452.49723978102 196, 471.42297984790 901, 495.93697480000 003,
520.94220042016 798, 548.60284823008 897, 582.08565117370 904,
616.83703333333 301, 659.49065797872 311, 704.45593011363 599,
756.00148597561 008, 821.08770662251 698]
y:
[(1.49+1.8779999 999999999j), (1.53+1.889j), (1.53+1.893j),
(1.54+1.8979999 999999999j), (1.48+1.883j), (1.48+1.871j),
(1.5+1.86600000 00000001j), (1.48+1.895j), (1.46+1.9330000 000000001j),
(1.47+1.952j), (1.46+1.958j), (1.45+1.948j),
(1.379999999999 9999+1.91399999 99999999j), (1.310000000000 0001+1.849j),
(1.04+1.833j), (0.62+2.081j), (0.429999999999 99999+2.4550000 000000001j),
(0.289999999999 99998+2.863j), (0.209999999999 99999+3.2719999 999999998j),
(0.140000000000 00001+3.6970000 000000001j), (0.13+4.1029999 999999998j),
(0.140000000000 00001+4.5119999 999999996j), (0.16+5.0830000 000000002j)]
I would really appreciate some help.
Thanks,
Alex
2  3841 
The routine requires real arrays, and you are giving it one complex
one. It does not know what to do with the complex array. What are you
expecting it to do? If you need the real and imaginary parts to be
separately interpolated, then split the complex array into two real
arrays and use the routine twice.
On 30 Apr 2005 12:32:31 -0700, bgs <bg****@hotmail .com> said: The routine requires real arrays, and you are giving it one complex
one. It does not know what to do with the complex array. What are you
expecting it to do? If you need the real and imaginary parts to be
separately interpolated, then split the complex array into two real
arrays and use the routine twice.
Hello,
Thanks for the pointer. I will interpolate the real and imaginary parts
separately then.
Regards,
Alex This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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