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Results tagged with list-manipulation
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user 1178
Questions on the manipulation of List objects in Mathematica, and the functions used for these manipulations.
2
votes
How to pick an element of a row corresponding to the minimum in a particular column?
Beware of the possibility of multiple minima, especially in long lists of discrete elements. I think for a novice J.M.'s solution is the more instructive.
I have changed its first element to demonstr …
- 1,913
8
votes
Sorting a list with secondary criterion
Coming from a long experience in Perl, one of my great disappointments in Mathematica was the tricky business of sorting multidimensional lists and strings.
Sort orders strings as in a dictionary, w …
- 1,913
5
votes
Error with using ReplaceAll
One way is not using ReplaceAll, but
data[[1 ;; 2]] = {{{3841, 6870}, {3822, 6869}}, {{3922, 6869}, {3941,
6870}}}
which overwrites the first two elements. The remainder of the list remains the same …
- 1,913
6
votes
Generating all possible 2x2 matrices with unique elements from 1 to 4
Annotating my comment.
The expression Permutations[{1, 2, 3, 4}] generates all 24 permutations of the list {1,2,3,4}. For example, the list {3,1,4,2} is one of those.
In order to construct a 2x2 matri …
- 1,913
6
votes
How to split a number
Processing dates by integers is extremely error-prone. Here is an example from the excellent book by Paul Wellin (p.598).
Compare this
DateList[19001231];
Take[%,3]
(* Out: {1900, 8, 8} *)
with this …
- 1,913