Hello. I'm using SymPy 0.7.2 on Py3 and 0.7.1 on Py2, both on Kubuntu Precise. Please note below how simplify() is not able to take the square root of denom even though it is a perfect square. It wasn't even able to simplify the effect of expand(). Is this a known/unknown bug and should I report it? Thanks.
In [1]: from sympy import * In [2]: var('d,ax,ay,vx,vy,a2,v2,denom') Out[2]: (d, ax, ay, vx, vy, a2, v2, denom) In [3]: d=ax*vx+ay*vy In [4]: v2=vx*vx+vy*vy In [5]: a2=ax*ax+ay*ay In [6]: denom=v2*a2-d*d In [7]: sqrt(denom) Out[7]: sqrt((ax**2 + ay**2)*(vx**2 + vy**2) - (ax*vx + ay*vy)**2) In [8]: simplify(sqrt(denom)) Out[8]: sqrt(ax**2*vy**2 - 2*ax*ay*vx*vy + ay**2*vx**2) In [9]: sqrt(simplify(denom)) Out[9]: sqrt(ax**2*vy**2 - 2*ax*ay*vx*vy + ay**2*vx**2) In [10]: (ax*vy-ay*vx)**2 Out[10]: (ax*vy - ay*vx)**2 In [11]: ((ax*vy-ay*vx)**2).expand() Out[11]: ax**2*vy**2 - 2*ax*ay*vx*vy + ay**2*vx**2 In [12]: simplify(((ax*vy-ay*vx)**2).expand()) Out[12]: ax**2*vy**2 - 2*ax*ay*vx*vy + ay**2*vx**2 -- Shriramana Sharma -- You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to sympy@googlegroups.com. To unsubscribe from this group, send email to sympy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sympy?hl=en.