Hi,
I have just started using sympy and tried to solve a PDE like this:
My approach in sympy was:
from sympy.solvers.pde import pdsolve
from sympy import Function, diff, pprint, Eq, init_printing
from sympy.abc import x,t,c
init_printing()
u = Function('u')
w = Eq(diff(u(t),t,2) - (c**2*diff(u(x),x,2)),0)
pdsolve(w, u(x,t),hint="all")
Unfortunataly I've got some error-messages which I can't handle.
Is there any help?
Thanks a lot.
The error messages were:
ValueError Traceback (most recent call
last)<ipython-input-12-e0eef578ab5a> in <module>()----> 1 pdsolve(w,
u(x,t),hint="all")
C:\WinPython\WinPython-32bit-3.5.2.1\python-3.5.2\lib\site-packages\sympy\solvers\pde.py
in pdsolve(eq, func, hint, dict, solvefun, **kwargs) 171 # See the
docstring of _desolve for more details. 172 hints = _desolve(eq,
func=func,--> 173 hint=hint, simplify=True, type='pde', **kwargs)
174 eq = hints.pop('eq', False) 175 all_ = hints.pop('all', False)
C:\WinPython\WinPython-32bit-3.5.2.1\python-3.5.2\lib\site-packages\sympy\solvers\deutils.py
in _desolve(eq, func, hint, ics, simplify, **kwargs) 224 if
hints['order'] == 0: 225 raise ValueError(--> 226
str(eq) + " is not a differential equation in " + str(func)) 227 228
if not hints['default']:
ValueError: -c**2*Derivative(u(x), x, x) + Derivative(u(t), t, t) is not a
differential equation in u(x, t)
−c2d2dx2u(x)+d2dt2u(t)=0
M
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