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Results tagged with map
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user 26956
Questions about applying functions or operators to expressions, especially constructs that take advantage of Map (/@) functionality.
2
votes
Referring to arguments in nested functions
The Map statement can be rewritten as such:
Map[
Function[{elementOfFirstList},
Select[secondList,
Function[{elementOfSecondList},
StringMatchQ[myFunction[elementOfSecondList], elementOfFirstList …
- 11.5k
5
votes
Indexed Map Thread
At face value there is this solution:
IndexedMapThread[list1_,list2_] :=
MapThread[(#1*#3+#2*#4 &),{list1,list2,Range@Length@list1,Range@Length@list2}]
IndexedMapThread[{a, b, c}, {d, e, f}]
(* …
- 11.5k
5
votes
How to Map a subset of list elements to a function?
It's strange, that ListCorrelate has not been mentioned, according to the documentation, it has been around unchanged since v.4.0. It allows a one liner:
ListCorrelate[{1, 1}, Range@9, {1, -1}, {}, T …
- 11.5k
9
votes
Accepted
how to concatenate a list of a list of strings
Here's an approach for any two multi-dimensional lists of strings which have arbitrary, but matching structures:
stringJoin[x__String] := StringJoin[x]
SetAttributes[stringJoin, Listable]
stringJoin[ …
- 11.5k
10
votes
1
answer
146
views
MapAt with Replace(All) causing kernel crash
Bug introduced in 10.1 and fixed in 10.2
I wanted to roll a function that works like /. but only acts on the very first match it encounters.
ReplaceAtFirst =
Function[{expr, rule},
MapAt[Repla …
- 11.5k
4
votes
Accepted
MapAt with Replace(All) causing kernel crash
Bug introduced in 10.1 and fixed in 10.2
From the comments of @Szabolcs and @SquareOne:
Works under OS X in 10.0 and 10.2, but not in 10.1.
From my observations:
Works under Win7x64 in 8.0 and 10. …
- 11.5k