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Mar
13
revised Counting the number of a specific type of permutation
added 177 characters in body
Mar
13
revised Counting the number of a specific type of permutation
a bit more general
Mar
13
revised Counting the number of a specific type of permutation
a bit more general
Mar
13
revised Counting the number of a specific type of permutation
added 135 characters in body
Mar
13
answered Counting the number of a specific type of permutation
Mar
12
comment How stretch curly brace on multi-line text?
Nice. Is it possible, perhaps by some minor tweak or use of an alignment marker, to align the equal sign of equations of varying lengths?
Mar
11
comment How to construct pairs in a list?
Wouldn't "all" possible pairs from list2 be this?: Tuples[list1, 2] // Union, yielding {{1, 1}, {1, 2}, {1, 5}, {2, 1}, {2, 2}, {2, 5}, {5, 1}, {5, 2}, {5, 5}}
Mar
11
comment Select rows from table by keys
Thanks for the correction.
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.