Thank you.Will go for it. On Tue, Apr 3, 2012 at 6:45 AM, Aleksandar Makelov < [email protected]> wrote:
> Maybe something like atoms(): > http://docs.sympy.org/dev/modules/core.html#sympy.core.basic.Basic.atoms > is going to help > > On Apr 2, 8:47 pm, Manoj babu <[email protected]> wrote: > > Hi > > This is Manoj doing my Btech 3rd year at IIT Kharagpur.I am > > working on trigonometric simplication by fu..http://rfdz.ph-noe.ac.at/ > > fileadmin/Mathematik_Uploads/ACDCA/DESTIME2006/DES_contribs/Fu/ > > simplification.pdf > > i have samll query > > this is the code i have written > > > > matchers = ( > > (a*sin(b+c)**d, (a*sin(b)*cos(c) + a* sin(c)*cos(b))**d, 4), > > (a*cos(b+c)**d, (a*cos(b)*cos(c) - a* sin(c)*sin(b))**d, 4), > > #(a*tan(b + c)**d, (a*(tan(b) + tan(c))/(1 - > > tan(c)*tan(b)))**d), > > > > (a*cos(2*b)**c, (1 - 2*a*sin(b)**2)**c, 3), > > (a*sin(2*b)**c, (2*a*sin(b)*cos(b))**c, 3) > > ) > > > > elif expr.is_Add: > > expr = expr.n() > > if expr.has(sin,cos) and not expr.has(tan): > > for pattern,result,n in matchers: > > ret = S.Zero > > res = None > > if expr.is_Add: > > for term in expr.args: > > res = term.match(pattern) > > if res is not None: > > if len(res) == n and (0 not in > > res.values()): > > <b> # if pattern == (matchers[2][0] or > > matchers[3,0]) and res[b].is_Mul: > > # ret += term </b> > > ret += result.subs(res).expand() > > else: > > ret += term > > if res is None: > > ret += term > > expr = ret.n() > > else: > > break > > return expr > > > > in trigsimp_recursive simplify.py > > > > The code is not yet completed...i am presetly working on Rule list 2 > > TR 10-TR 4-TR3 -''TR 11''-TR5. > > The problem is (bolded in the code) if the expr contains sin(x).cos(x) > > etc which were expanded in TR10 ... now using the TR 11 for expr.args > > its converting sin(x),cos(x) into half angle arguements which is not > > required and aslo converting cos(2x) in terms of x which is > > required.What can a solution so that it understands that there is a > > double angle and converts only that. > > Is there any sympy function that analyses the arg..ie if there is an > > expression sin(x) + sin(y) + sin(x/2) then it should return all the > > symbols in the expr as a tuple (x,y,x/2)..so that it can understand > > there is a double angle and it can covert only that. > > or please suggest me some other matcher which evaluates the expansion > > of only double angle.. > > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/sympy?hl=en. > > -- You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/sympy?hl=en.
