Find non-case sensitive string in a mixed list of elements? The 2019 Stack Overflow Developer Survey Results Are InBuilding a list recursive with one or more argumentsReturn Functions from parallel execution of moduleFast method to select matrix elements based on a vector of positionsIssue with very large lists in MathematicaFaster position list construction from a “take instructions” listConvert elements of list to stringAdding a collection of neighbors to points in a list, concatenating strings, parallelization/optimizing run-time?Get sublists by pattern?Obtaining the position in a list where the i^th element is bigger than the (i+1)^th elementExtract all instances of variables matching a pattern?
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Find non-case sensitive string in a mixed list of elements?
The 2019 Stack Overflow Developer Survey Results Are InBuilding a list recursive with one or more argumentsReturn Functions from parallel execution of moduleFast method to select matrix elements based on a vector of positionsIssue with very large lists in MathematicaFaster position list construction from a “take instructions” listConvert elements of list to stringAdding a collection of neighbors to points in a list, concatenating strings, parallelization/optimizing run-time?Get sublists by pattern?Obtaining the position in a list where the i^th element is bigger than the (i+1)^th elementExtract all instances of variables matching a pattern?
$begingroup$
Consider an example list with mixed element types, e.g.:
list = 1.234 , a[2] , "Abc" , 4/5 , "acb" ;
I would like to have a function that finds the position of a string, without regard to upper or lower characters, e.g.:
findPosition[list,"abc"]
3,1
Is there a function like that in Mathematica? Or maybe one can implement it with efficient performance?
EDIT:
My current workaround is:
findPosition[list_,str_]:=Position[list/.x_String:>ToLowerCase[x],ToLowerCase[str]]
list-manipulation function-construction searching
asked Mar 30 at 21:15
KagaratschKagaratsch
4,83831348
$endgroup$
add a comment |
$begingroup$
Consider an example list with mixed element types, e.g.:
list = 1.234 , a[2] , "Abc" , 4/5 , "acb" ;
I would like to have a function that finds the position of a string, without regard to upper or lower characters, e.g.:
findPosition[list,"abc"]
3,1
Is there a function like that in Mathematica? Or maybe one can implement it with efficient performance?
EDIT:
My current workaround is:
findPosition[list_,str_]:=Position[list/.x_String:>ToLowerCase[x],ToLowerCase[str]]
list-manipulation function-construction searching
asked Mar 30 at 21:15
KagaratschKagaratsch
4,83831348
$endgroup$
add a comment |
$begingroup$
Consider an example list with mixed element types, e.g.:
list = 1.234 , a[2] , "Abc" , 4/5 , "acb" ;
I would like to have a function that finds the position of a string, without regard to upper or lower characters, e.g.:
findPosition[list,"abc"]
3,1
Is there a function like that in Mathematica? Or maybe one can implement it with efficient performance?
EDIT:
My current workaround is:
findPosition[list_,str_]:=Position[list/.x_String:>ToLowerCase[x],ToLowerCase[str]]
list-manipulation function-construction searching
asked Mar 30 at 21:15
KagaratschKagaratsch
4,83831348
$endgroup$
Consider an example list with mixed element types, e.g.:
list = 1.234 , a[2] , "Abc" , 4/5 , "acb" ;
I would like to have a function that finds the position of a string, without regard to upper or lower characters, e.g.:
findPosition[list,"abc"]
3,1
Is there a function like that in Mathematica? Or maybe one can implement it with efficient performance?
EDIT:
My current workaround is:
findPosition[list_,str_]:=Position[list/.x_String:>ToLowerCase[x],ToLowerCase[str]]
list-manipulation function-construction searching
list-manipulation function-construction searching
asked Mar 30 at 21:15
KagaratschKagaratsch
4,83831348
asked Mar 30 at 21:15
KagaratschKagaratsch
4,83831348
edited Mar 30 at 21:21
Kagaratsch
asked Mar 30 at 21:15
KagaratschKagaratsch
4,83831348
asked Mar 30 at 21:15
KagaratschKagaratsch
4,83831348
asked Mar 30 at 21:15
KagaratschKagaratsch
4,83831348
4,83831348
add a comment |
add a comment |
3 Answers
3
active
oldest
votes
$begingroup$
Recall that StringMatchQ[] has the IgnoreCase option:
Position[1.234, a[2], "Abc", 4/5, "acb",
s_String /; StringMatchQ[s, "abc", IgnoreCase -> True]]
3, 1
$endgroup$
1
$begingroup$
Decided to go with this answer after all, since it is minimal, as all it does is a query -- no operations on the data.
$endgroup$
– Kagaratsch
Mar 31 at 3:11
add a comment |
$begingroup$
Position[list, s_String /; ToLowerCase[s] == "abc"]
3, 1
or
Position[list, s_String?(EqualTo["abc"]@*ToLowerCase)]
answered Mar 30 at 21:21
Henrik SchumacherHenrik Schumacher
59.9k582167
$endgroup$
$begingroup$
I like how this does not need to make substitutions inlistitself to search it!
$endgroup$
– Kagaratsch
Mar 30 at 21:24
2
$begingroup$
Position[ToLowerCase[list], "abc"]also works.
$endgroup$
– C. E.
Mar 30 at 22:17
$begingroup$
The rationale behind using a_Stringpattern is to pre-filter with a very inexpensive test: This ensures that only few expressions are actually fed toToLowerCase.
$endgroup$
– Henrik Schumacher
Mar 31 at 7:19
add a comment |
$begingroup$
Note that ToLowerCase does not evaluate if the input is not a string, but it is Listable, so it will thread over your list:
list = 1.234, a[2], "Abc", 4/5, "acb";
ToLowerCase[list]
(* Out: ToLowerCase[1.234], ToLowerCase[a[2]], "abc", ToLowerCase[4/5], "acb" *)
That should not bother you though; it certainly does not bother Position:
Position[ToLowerCase[list], "abc"]
(* Out: 3, 1 *)
answered Mar 30 at 23:28
MarcoBMarcoB
38.7k557115
$endgroup$
add a comment |
Your Answer
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
Recall that StringMatchQ[] has the IgnoreCase option:
Position[1.234, a[2], "Abc", 4/5, "acb",
s_String /; StringMatchQ[s, "abc", IgnoreCase -> True]]
3, 1
$endgroup$
1
$begingroup$
Decided to go with this answer after all, since it is minimal, as all it does is a query -- no operations on the data.
$endgroup$
– Kagaratsch
Mar 31 at 3:11
add a comment |
$begingroup$
Recall that StringMatchQ[] has the IgnoreCase option:
Position[1.234, a[2], "Abc", 4/5, "acb",
s_String /; StringMatchQ[s, "abc", IgnoreCase -> True]]
3, 1
$endgroup$
1
$begingroup$
Decided to go with this answer after all, since it is minimal, as all it does is a query -- no operations on the data.
$endgroup$
– Kagaratsch
Mar 31 at 3:11
add a comment |
$begingroup$
Recall that StringMatchQ[] has the IgnoreCase option:
Position[1.234, a[2], "Abc", 4/5, "acb",
s_String /; StringMatchQ[s, "abc", IgnoreCase -> True]]
3, 1
$endgroup$
Recall that StringMatchQ[] has the IgnoreCase option:
Position[1.234, a[2], "Abc", 4/5, "acb",
s_String /; StringMatchQ[s, "abc", IgnoreCase -> True]]
3, 1
answered Mar 31 at 0:03
community wiki
J. M. is away
1
$begingroup$
Decided to go with this answer after all, since it is minimal, as all it does is a query -- no operations on the data.
$endgroup$
– Kagaratsch
Mar 31 at 3:11
add a comment |
1
$begingroup$
Decided to go with this answer after all, since it is minimal, as all it does is a query -- no operations on the data.
$endgroup$
– Kagaratsch
Mar 31 at 3:11
1
1
$begingroup$
Decided to go with this answer after all, since it is minimal, as all it does is a query -- no operations on the data.
$endgroup$
– Kagaratsch
Mar 31 at 3:11
$begingroup$
Decided to go with this answer after all, since it is minimal, as all it does is a query -- no operations on the data.
$endgroup$
– Kagaratsch
Mar 31 at 3:11
add a comment |
$begingroup$
Position[list, s_String /; ToLowerCase[s] == "abc"]
3, 1
or
Position[list, s_String?(EqualTo["abc"]@*ToLowerCase)]
answered Mar 30 at 21:21
Henrik SchumacherHenrik Schumacher
59.9k582167
$endgroup$
$begingroup$
I like how this does not need to make substitutions inlistitself to search it!
$endgroup$
– Kagaratsch
Mar 30 at 21:24
2
$begingroup$
Position[ToLowerCase[list], "abc"]also works.
$endgroup$
– C. E.
Mar 30 at 22:17
$begingroup$
The rationale behind using a_Stringpattern is to pre-filter with a very inexpensive test: This ensures that only few expressions are actually fed toToLowerCase.
$endgroup$
– Henrik Schumacher
Mar 31 at 7:19
add a comment |
$begingroup$
Position[list, s_String /; ToLowerCase[s] == "abc"]
3, 1
or
Position[list, s_String?(EqualTo["abc"]@*ToLowerCase)]
answered Mar 30 at 21:21
Henrik SchumacherHenrik Schumacher
59.9k582167
$endgroup$
$begingroup$
I like how this does not need to make substitutions inlistitself to search it!
$endgroup$
– Kagaratsch
Mar 30 at 21:24
2
$begingroup$
Position[ToLowerCase[list], "abc"]also works.
$endgroup$
– C. E.
Mar 30 at 22:17
$begingroup$
The rationale behind using a_Stringpattern is to pre-filter with a very inexpensive test: This ensures that only few expressions are actually fed toToLowerCase.
$endgroup$
– Henrik Schumacher
Mar 31 at 7:19
add a comment |
$begingroup$
Position[list, s_String /; ToLowerCase[s] == "abc"]
3, 1
or
Position[list, s_String?(EqualTo["abc"]@*ToLowerCase)]
answered Mar 30 at 21:21
Henrik SchumacherHenrik Schumacher
59.9k582167
$endgroup$
Position[list, s_String /; ToLowerCase[s] == "abc"]
3, 1
or
Position[list, s_String?(EqualTo["abc"]@*ToLowerCase)]
answered Mar 30 at 21:21
Henrik SchumacherHenrik Schumacher
59.9k582167
answered Mar 30 at 21:21
Henrik SchumacherHenrik Schumacher
59.9k582167
answered Mar 30 at 21:21
Henrik SchumacherHenrik Schumacher
59.9k582167
answered Mar 30 at 21:21
Henrik SchumacherHenrik Schumacher
59.9k582167
59.9k582167
$begingroup$
I like how this does not need to make substitutions inlistitself to search it!
$endgroup$
– Kagaratsch
Mar 30 at 21:24
2
$begingroup$
Position[ToLowerCase[list], "abc"]also works.
$endgroup$
– C. E.
Mar 30 at 22:17
$begingroup$
The rationale behind using a_Stringpattern is to pre-filter with a very inexpensive test: This ensures that only few expressions are actually fed toToLowerCase.
$endgroup$
– Henrik Schumacher
Mar 31 at 7:19
add a comment |
$begingroup$
I like how this does not need to make substitutions inlistitself to search it!
$endgroup$
– Kagaratsch
Mar 30 at 21:24
2
$begingroup$
Position[ToLowerCase[list], "abc"]also works.
$endgroup$
– C. E.
Mar 30 at 22:17
$begingroup$
The rationale behind using a_Stringpattern is to pre-filter with a very inexpensive test: This ensures that only few expressions are actually fed toToLowerCase.
$endgroup$
– Henrik Schumacher
Mar 31 at 7:19
$begingroup$
I like how this does not need to make substitutions in
list itself to search it!$endgroup$
– Kagaratsch
Mar 30 at 21:24
$begingroup$
I like how this does not need to make substitutions in
list itself to search it!$endgroup$
– Kagaratsch
Mar 30 at 21:24
2
2
$begingroup$
Position[ToLowerCase[list], "abc"] also works.$endgroup$
– C. E.
Mar 30 at 22:17
$begingroup$
Position[ToLowerCase[list], "abc"] also works.$endgroup$
– C. E.
Mar 30 at 22:17
$begingroup$
The rationale behind using a
_String pattern is to pre-filter with a very inexpensive test: This ensures that only few expressions are actually fed to ToLowerCase.$endgroup$
– Henrik Schumacher
Mar 31 at 7:19
$begingroup$
The rationale behind using a
_String pattern is to pre-filter with a very inexpensive test: This ensures that only few expressions are actually fed to ToLowerCase.$endgroup$
– Henrik Schumacher
Mar 31 at 7:19
add a comment |
$begingroup$
Note that ToLowerCase does not evaluate if the input is not a string, but it is Listable, so it will thread over your list:
list = 1.234, a[2], "Abc", 4/5, "acb";
ToLowerCase[list]
(* Out: ToLowerCase[1.234], ToLowerCase[a[2]], "abc", ToLowerCase[4/5], "acb" *)
That should not bother you though; it certainly does not bother Position:
Position[ToLowerCase[list], "abc"]
(* Out: 3, 1 *)
answered Mar 30 at 23:28
MarcoBMarcoB
38.7k557115
$endgroup$
add a comment |
$begingroup$
Note that ToLowerCase does not evaluate if the input is not a string, but it is Listable, so it will thread over your list:
list = 1.234, a[2], "Abc", 4/5, "acb";
ToLowerCase[list]
(* Out: ToLowerCase[1.234], ToLowerCase[a[2]], "abc", ToLowerCase[4/5], "acb" *)
That should not bother you though; it certainly does not bother Position:
Position[ToLowerCase[list], "abc"]
(* Out: 3, 1 *)
answered Mar 30 at 23:28
MarcoBMarcoB
38.7k557115
$endgroup$
add a comment |
$begingroup$
Note that ToLowerCase does not evaluate if the input is not a string, but it is Listable, so it will thread over your list:
list = 1.234, a[2], "Abc", 4/5, "acb";
ToLowerCase[list]
(* Out: ToLowerCase[1.234], ToLowerCase[a[2]], "abc", ToLowerCase[4/5], "acb" *)
That should not bother you though; it certainly does not bother Position:
Position[ToLowerCase[list], "abc"]
(* Out: 3, 1 *)
answered Mar 30 at 23:28
MarcoBMarcoB
38.7k557115
$endgroup$
Note that ToLowerCase does not evaluate if the input is not a string, but it is Listable, so it will thread over your list:
list = 1.234, a[2], "Abc", 4/5, "acb";
ToLowerCase[list]
(* Out: ToLowerCase[1.234], ToLowerCase[a[2]], "abc", ToLowerCase[4/5], "acb" *)
That should not bother you though; it certainly does not bother Position:
Position[ToLowerCase[list], "abc"]
(* Out: 3, 1 *)
answered Mar 30 at 23:28
MarcoBMarcoB
38.7k557115
answered Mar 30 at 23:28
MarcoBMarcoB
38.7k557115
answered Mar 30 at 23:28
MarcoBMarcoB
38.7k557115
answered Mar 30 at 23:28
MarcoBMarcoB
38.7k557115
38.7k557115
add a comment |
add a comment |
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