Status: Accepted Owner: asmeurer Labels: Type-Defect Priority-Medium New issue 1429 by asmeurer: matches fails to match differential equation http://code.google.com/p/sympy/issues/detail?id=1429
See this thread: http://groups.google.com/group/sympy/browse_thread/thread/d1ca8352bcb187a8 >>> a = Wild('a', exclude=[f(x).diff(x)]) >>> b = Wild('b', exclude=[f(x).diff(x)]) >>> eq = x+f(x) - (x - f(x))*diff(f(x), x) >>> r = eq.match(a+b*diff(f(x),x)) r is None. I need it to be {a:x+f(x), b:-(x-f(x))}. This works for other things similarly formatted, for example: >>> eq1 = 2*x+f(x)*cos(x)+(2*f(x)+sin(x)-sin(f(x)))*f(x).diff(x) >>> eq1.match(a+b*diff(f(x),x)) {a: 2⋅x + cos(x)⋅f(x), b: -sin(f(x)) + 2⋅f(x) + sin(x)} Changing a to a Wild without exclusions sort of produces the right result. >>> a = Wild('a') >>> r = eq.match(a+b*diff(f(x),x)) >>> r ⎧ d d ⎫ ⎨a: x - (-x + f(x))⋅──(f(x)) - (x - f(x))⋅──(f(x)) + f(x), b: -x + f(x)⎬ ⎩ dx dx ⎭ >>> simplify r[a] x + f(x) -- You received this message because you are listed in the owner or CC fields of this issue, or because you starred this issue. You may adjust your issue notification preferences at: http://code.google.com/hosting/settings --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sympy-issues" group. To post to this group, send email to sympy-issues@googlegroups.com To unsubscribe from this group, send email to sympy-issues+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sympy-issues?hl=en -~----------~----~----~----~------~----~------~--~---
