Hi: I am trying to evaluate a double integral (since I cannot put
LaTeX, the 'S' below
stands for the integral sign:)
1 sqrt(x)
S S 4xy - y^3 dy dx
0 x^3
This is what I put into sage:
sage: var('x,y')
(x, y)
sage: f=4*x*y-y^3
sage: print f
3
4 x y - y
sage: print integrate(integrate(f,y,x^3,x^0.5),y,0,1)
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
/home/vkg/sage-3.1.1/<ipython console> in <module>()
/home/vkg/sage-3.1.1/local/lib/python2.5/site-packages/sage/calculus/
functional.
py in integral(f, *args, **kwds)
252 """
253 try:
--> 254 return f.integral(*args, **kwds)
255 except ValueError, err:
256 raise err
/home/vkg/sage-3.1.1/local/lib/python2.5/site-packages/sage/calculus/
calculus.py
in integral(self, v, a, b)
2523 raise ValueError, "Integral is divergent."
2524 else:
-> 2525 raise TypeError, error
2526
2527
TypeError: Computation failed since Maxima requested additional
constraints (use
assume):
Is x positive or negative?
Am I doing something wrong here?
Thanks much in advance.
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