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Mar
11
comment Select rows from table by keys
+1 for the usefulness of seeing a side-by-side comparison of the functions.
Mar
11
comment Select rows from table by keys
I think in many cases, SortBy[data,{First}] may be simplified to Sort[data].
Mar
10
comment Select rows from table by keys
Actually, Sort[data] is sufficient if it's inside the GatherBy.
Mar
10
comment Select rows from table by keys
Thanks. Yes, Mathematica knows many useful ways to manipulate lists. BTW, if you wanted the id's to appear in standard order, you might do a SortBy[data,First] before GatherBy.
Mar
10
revised Select rows from table by keys
TableForm added
Mar
10
answered Select rows from table by keys
Mar
10
comment Select rows from table by keys
GatherBy will possibly be of use: reference.wolfram.com/mathematica/ref/GatherBy.html
Mar
9
comment Dashed mesh behind 3D object
+1 SphericalPlot3D a good choice.
Mar
9
revised Dashed mesh behind 3D object
clearer image and explanation
Mar
9
answered Dashed mesh behind 3D object
Mar
8
revised How to draw a higher-genus surface
smoother rendering
Mar
8
comment How to draw a higher-genus surface
I know what you mean. It will look slightly better without the mesh, but the shape is more like a bee-stung 8.
Mar
8
comment How to draw a higher-genus surface
+1 Nice pretzel!
Mar
8
answered How to draw a higher-genus surface
Mar
8
comment How to draw a higher-genus surface
Stan Wagon's 2 double torus's can be found at blog.wolfram.com/2010/12/17/…
Mar
8
comment How to draw a higher-genus surface
Does Stan Wagon's one-liner double torus look like the sort of thing you are looking for? ContourPlot3D[(x^4 - x^2 + y^2)^2 + 9 z^2 == .04, {x, -1.2, 1.2}, {y, -1, 1}, {z, -.4, .4}, PlotPoints -> 30, Boxed -> False, Axes -> False, ContourStyle -> Yellow]
Mar
8
comment SetDelayed and avoiding function calls through memoization
see mathematica.stackexchange.com/search?q=memoization and en.wikipedia.org/wiki/Memoization and reference.wolfram.com/mathematica/tutorial/…
Mar
8
revised SetDelayed and avoiding function calls through memoization
edited tags; edited title
Mar
4
comment Soft-Match String Comparison
Hi Ulrik, I added some links. Remove them if you like. Or keep them. Hope you don't mind. David
Mar
4
revised Soft-Match String Comparison
links added