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[bug]Calculate a conditional re-integration
04-11-2019, 12:57 PM
Post: #1
[bug]Calculate a conditional re-integration
Not much to say, directly on the code
Code:
∫(∫(min(x^2,y^2),y,0,1),x,0,3)
The XCAS terminal gives a big push warning
Code:
Warning, integration of abs or sign assumes constant sign by intervals (correct if the argument is real):
Check [abs(taylorx10^2-taylorx11^2)]
Discontinuities at zeroes of taylorx10^2-taylorx11^2 were not checked
No checks were made for singular points of antiderivative (taylorx10^2*taylorx11+(taylorx11^3)/3-(-(taylorx11^3)/3+taylorx10^2*taylorx11)*sign(taylorx10^2-taylorx11^2))/2 for definite integration in [0,1]
Warning, integration of abs or sign assumes constant sign by intervals (correct if the argument is real):
Check [sign(taylorx10^2-1)]
Discontinuities at zeroes of taylorx10^2-1 were not checked
Warning, integration of abs or sign assumes constant sign by intervals (correct if the argument is real):
Check [sign(taylorx10^2-1)]
Discontinuities at zeroes of taylorx10^2-1 were not checked



XCAS also gives the answer
Code:
1



But it is the wrong answer

WolframAlpha: ∫(∫(min(x^2,y^2),y,0,1),x,0,3)

Wolfram Alpha is right


Looking forward to the update of hp prime firmware in 2019

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[bug]Calculate a conditional re-integration - yangyongkang - 04-11-2019 12:57 PM



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