36 lines
No EOL
952 B
Python
36 lines
No EOL
952 B
Python
import numpy as np
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import ctypes, subprocess
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recompile = True
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if recompile:
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p = subprocess.Popen('g++ -shared -o libmain.so -fPIC loadtxt.cpp main.cpp -lgsl'.split())
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p.wait()
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if p.returncode != 0: raise RuntimeError(p.returncode)
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libmain = ctypes.CDLL('./libmain.so')
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def integrate(y0, t_max, step_size=None):
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y0 = (ctypes.c_double*6)(*y0)
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if step_size is None: step_size = t_max
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size = int(t_max // step_size) + 1
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y = (ctypes.c_double*size*6)()
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status = libmain.integrate(y0, ctypes.c_double(t_max), ctypes.c_double(step_size), y)
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y = np.array(y).reshape(size,6)
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return np.array(y), status
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gsl_success = libmain.gsl_success()
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from pylab import *
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t_max = 10
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ic = [80,0,0,0,80,0]
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res = integrate(ic, t_max, step_size=1/4096)
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x, y, z, vx, vy, vz = res[0].T
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zzz = x[-1]
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plot(x,y)
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res = integrate(ic, t_max)
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x, y, z, vx, vy, vz = res[0].T
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plot(x,y,'o')
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print(zzz - x[-1])
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# gca().set_aspect('equal')
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show() |