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RSS Feed for Wolfram Community showing any discussions in tag Calculus sorted by activeWhy is this integral different when the variable is substituted?
http://community.wolfram.com/groups/-/m/t/1038147
In Mathematica, typing
Integrate[Abs[-0.7 - y]*(1 - Abs[y]), {y, -1, 1}]
yields 0.709, but typing
Integrate[Abs[x - y]*(1 - Abs[y]), {y, -1, 1}] /. x -> -0.7
yields 1/3. I am not experienced with Mathematica but I was hoping someone would be able to explain to me why these give different answers.Alexander Dunlap2017-03-23T18:11:40ZSolve an equation with a Piecewise function?
http://community.wolfram.com/groups/-/m/t/1035180
Hello I'm new to Mathematica, though I know a few about it. I'm trying to find a group of 2 values for Piecewise function changing with x, but I constantly have a problem with Solve producing a lot of errors can you tell me where is my mistake in this ? Whole thing is in attached file, Basically its:
F(x)=Piecewise[...](x,wl,wp)
Solve[MaxValue[F,x]/MinValue[F,x]==1.15,{wl,wp}] Or
CylindricalDecomposition[1.1<=MaxValue[F,x]/MinValue[F,x]<=1.2,{wl,wp}]
So I'm trying to get wl and wp values for optimization, but certainly I'm doing something wrong, please help.Pio Tyldens2017-03-19T15:24:41ZCalculate (A*Nabla)B ?
http://community.wolfram.com/groups/-/m/t/1035972
Does anyone how to write (A*Nabla)B in Mathematica?
As far as I understood I can also write (A*Nabla)B=Nabla(A*Transposed[B])-B(Nabla*A), but I can't get this to work either as I don't know how to write A*Transposed(B).
Any ideas?mkssion2017-03-20T18:28:47Z