David Skulsky

2,067 reputation

1823

bio	website	jpl.nasa.gov
	location	Pasadena, CA
	age	46
visits	member for	1 year, 4 months
	seen	22 hours ago
stats	profile views	190

I survived the seven minutes of terror.

	2,067 reputation	bio	website	jpl.nasa.gov	visits	member for	1 year, 4 months
1823 badges		location	Pasadena, CA		seen	22 hours ago

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Nov 13	comment	problem solving coupled second order differential equations using Dsolve I can confirm that Mathematica will yield a solution when c1, ..., c6 are exactly 1 (and with the code for z''[t] consistent with the equation at the top of the question), but the result is extremely large and not particularly useful. If you replace c1, ..., c6 with 1., you will quickly get a result which shows the structure of the solution and it ain't pretty (46th order polynomials in t).
Nov 13	comment	problem solving coupled second order differential equations using Dsolve I just noticed another problem: the equation implemented for z''[t] is not the same as the equation listed at the beginning of the question.
Nov 13	comment	problem solving coupled second order differential equations using Dsolve I would think that c6, in particular, would pose a serious problem for DSolve. At a minimum, the OP might want to specify that c6 != 0.
Nov 12	comment	problem solving coupled second order differential equations using Dsolve And FullSimplify instead of FullySimplify.
Nov 8	awarded	Notable Question
Oct 14	awarded	Popular Question
Aug 15	revised	RootSum result manipulation/simplification Corrected a typo in the title.
Aug 15	suggested	suggested edit on RootSum result manipulation/simplification
Jun 22	comment	(Non-Convex) Polygon Union and Intersection Functions They're very similar. I wasn't aware of the prior question.
Jun 22	awarded	Nice Question
Jun 22	comment	(Non-Convex) Polygon Union and Intersection Functions Can you post the vertices of the resulting polygon? I suspect there's an ordering difference, but I have no idea why. I'm running MMA v.8.0.4.
Jun 22	comment	(Non-Convex) Polygon Union and Intersection Functions Is the code you posted what you used to generate the figure? I ask because when I run the code, I get a different result for the fk polygon (the coordinates of the vertices are {{7, 7}, {353, 7}, {181, 306}, {8, 7}, {181, 306}, {254, 178}, {289, 118}, {353, 7}, {352, 178}, {289, 115}, {250, 181}, {352, 180}, {331, 47}, {352, 6}} ).
Jun 21	revised	(Non-Convex) Polygon Union and Intersection Functions Expanded the question to include intersection on non-convex polygons
Jun 21	comment	(Non-Convex) Polygon Union and Intersection Functions @ruebenko: I didn't realize it would only intersect convex polygons. Thanks for the heads up!
Jun 21	revised	(Non-Convex) Polygon Union and Intersection Functions deleted 4 characters in body
Jun 21	asked	(Non-Convex) Polygon Union and Intersection Functions
Jun 17	comment	How does Mathematica integrate? Hmmm... I wonder what I did wrong. I'll try it again.
Jun 16	comment	Plotting complex Sine +1 for generating a beautiful plot!
Jun 15	comment	How does Mathematica integrate? @The-Ever-Kid: Beats me.
Jun 15	comment	How does Mathematica integrate? Just for kicks I threw this integral at both Mathematica 8 and Maple 15. No problem for Mathematica, but Maple chokes.