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 Revival
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  • 0 posts edited
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  • 68 votes cast
Jul
28
awarded  Revival
Jul
28
comment How do I find the area between two polar curves?
@2012rcampion if I slightly modify this region say Area[ImplicitRegion[ 6 < Sqrt[x^2 + y^2] < 4 + 4 Cos[ArcTan[x, y] && x < 7 ], {x, y}]] (Try it with Show) even with MMA 10.2 I'm back to the error message Area::nmet: Unable to compute the area of region Imp.... It beats me your solution cannot be generalized even after 3 successive MMA versions since this new function has been announced!
Jul
28
revised RegionPlot of an area inside a polar plot (or its equivalent parametric plot)
updated after MMA 10.2 upgrade
Jul
26
comment How do I work with Root objects?
Using MMA 8 and your state of the art answer, I had no problem at all. But with MMA 10.0 some output format changed and I had to do some modifications to get again your answer.For example s = Solve[(3 - Cos[4 x]) (Sin[x] - Cos[x]) == 2, x, MaxExtraConditions -> 0] /. C[1] -> 0. But I now have 2 real solutions instead of 3 (-Pi is missing). Do you know which MMA version returns the correct answer?
Jun
17
awarded  Teacher
May
25
comment Plot draws list of curves in same color when not using Evaluate
I am sorry to have misled you, I genuinely thought to have a 10.1 version: I was confused between $Version which returned 10.0 and $ReleaseNumber which returned 1 (and I concatenated these 2 to make 10.1) and I forgot to give a feedback . I upgraded now to 10.1 and these errors are gone but others are still present (please look at my latest question to which I gave my own answer since no answer was given after 4 months).
May
18
answered RegionPlot of an area inside a polar plot (or its equivalent parametric plot)
Apr
9
comment Plot draws list of curves in same color when not using Evaluate
The other two methods also get the same error.
Apr
9
comment Plot draws list of curves in same color when not using Evaluate
To which V10 version does your Mathematica 10 update apply? With MMA V10.1 and Plot[{1, ## &[2, 3], 4}, {x, 0, 1}, PlotRange -> {0, 5}, PlotStyle -> Thick]' I get an error (Identity::argx: Identity called with 2 arguments; 1 argument is expected`
Apr
1
comment Proper way to Plot a single function in two different styles?
@Simon Woods Your useful splitplot and splitsyle functions don't work anymore with MMA V10. Can it be easily updated ? Thanks
Dec
28
revised RegionPlot of an area inside a polar plot (or its equivalent parametric plot)
added 66 characters in body
Dec
28
asked RegionPlot of an area inside a polar plot (or its equivalent parametric plot)
Oct
1
comment Fitting ellipse to 5 given points on the plane
Your ellipse definition is in fact the general equation of a conics - it is only an ellipse if the discriminant is negative. How does your answer take this restriction into account? Thanks
Oct
1
comment Fitting ellipse to 5 given points on the plane
With MMA V9 I do not get the right answer, for example f (-0.275185 + 1. x^2 + x (0.189022 + 0.566953 y) + 0.1281 y + 0.397124 y^2) == 0 is the equation of the ellipse which is returned. The parameter f is not resolved.
Sep
26
comment Finding length of intersection of two surfaces
On the contrary, to me your approach is quite elegant, concise with a flair for mathematics. And it works OK at least since MMA V5.
Jul
2
awarded  Curious
Jun
10
accepted Combine a contour plot of a conic and an inset with an polygon such as all its vertices are on the conic
Jun
9
comment Combine a contour plot of a conic and an inset with an polygon such as all its vertices are on the conic
@Kuba Correct! I didn't think about using {ColorData["Legacy", "Banana"], EdgeForm[{Thick, Pink}], Opacity[0.15], Polygon[{a, b, c, d}]} in the Epilog instead of Inset... to achieve the same result. Inset obviously here was a wrong option and I guess that finding correctly the right Size would have been challenging and futile. I consider your comment as an answer.
Jun
9
asked Combine a contour plot of a conic and an inset with an polygon such as all its vertices are on the conic
May
11
awarded  Informed