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Strangely, there isn't a built-in procedure in Racket for finding the 0-based index of an element in a list (the opposite procedure does exist, ...

Wolfram Community forum discussion about Find the largest element in a list and its position?. Stay on top of important topics and build connections by joining Wolfram Community groups relevant to your interests.

Lists are very important structures in the Wolfram Language . Lists allow you to treat any kind of collection of objects as a single entity. Sometimes you need to pick out or extract individual elements or groups of elements from a list.

findLargest1 [list_List] := Module [ {max, poss}, (* Find largest element in list *) {max} = TakeLargest [list, 1]; (* Find all positions of largest element in list *) poss = Flatten [Position [list, max]]; (* Return *) {max, poss} ] absTime = AbsoluteTime []; {max, poss} = findLargest1 [list]; absTime = AbsoluteTime [] - absTime; show [absTime, max, poss, findLargest1, "TakeLargest & Position", list]; findLargest1 (TakeLargest & Position): 0.923 sek.

Elements of Lists. The Wolfram Language provides a carefully chosen set of functions for accessing elements of lists using either indices or positions, or using patterns or criteria for their values. list [ [...]] ( Part) — parts of lists, resettable with =.

Position [expr, pattern] tests all the subparts of expr in turn to try and find ones that match pattern. Position returns a list of positions in a form suitable for use in Extract, ReplacePart, and MapAt. The form is different from the one used in Part. Position looks only for matches to values in Association objects that appear in expr.

Position[expr, pattern] gives a list of the positions at which objects matching pattern appear in ... Find all positions at which x to any power appears:.

Elements of Lists. The Wolfram Language provides a carefully chosen set of functions for accessing elements of lists using either indices or positions, or using patterns or criteria for their values. list [ [...]] ( Part) — parts of lists, resettable with =.

Get Elements of Lists. Lists are very important structures in the Wolfram Language. Lists allow you to treat any kind of collection of objects as a single entity. Sometimes you need to pick out or extract individual elements or groups of elements from a list. Set up a list of the first 10 squares (stored as v ):

22.02.2019 · So basically I try using Position to find the index at which the element in the list is equal to the wavelenght that I calculate based on an energy value. When I run it I get empty curly brackets. I even tried this: Position[SSpecWavelength, 1107.] and I still get empty curly brackets.

Given data = {280., 280.5, 281., 281.5, 282., 282.5, 283., 283.5, 284., 284.5};. you could use data[[;; Position[data, 282.][[1, 1]]]].

... to find the minimal element (if there are multiple occurences, just return any one of them), as well as its position, in a list using mathematica.

Feb 23, 2019 · So I tried replacing the 949 value by: Position [SSpecWavelength, Subscript [\ [Lambda], G] [Eg_]]/.numval. So basically I try using Position to find the index at which the element in the list is equal to the wavelenght that I calculate based on an energy value. When I run it I get empty curly brackets.

Nov 06, 2020 · This post was auto converted and may contain formatting errors. It occurred to me that I needed to find the minimal element (if there are multiple occurences, just return any one of them), as well as its position, in a list using mathematica. This seems to be a trivial problem and the easiest (but not the most efficient) way that came to the top of my head is the following one-liner code:

How can I find the indices i and j of all nonzero elements of a matrix. ... The difficulty is that Mathematica, in contrast to some programming

Position[expr, pattern] gives a list of the positions at which objects matching pattern appear in expr. Position[expr, pattern, levelspec] finds only objects that appear on levels specified by levelspec. Position[expr, pattern, levelspec, n] gives the positions of the first n objects found. Position[pattern] represents an operator form of Position that can be applied to an expression.

... "Element index from Mathematica Select", to no avail.) Anyway, this seems to be the way to do this: Position[list, 5->_];.

28.07.2011 · SelectIndices[list, #[[1]]==5&]; (* returns {2, 4} *) EDIT: I found an answer to the immediate question above (see below), but what about sorting. Say I want to sort a list but rather than returning the sorted list, I want to return the indices in the order of the sorted list?

"item not found.")) idx))). Extra credit: Since Clojure vectors implement java.util.List, you can switch .indexOf for .lastIndexOf to find ...

The number of elements of a set or list S is given by numelems(S). ... To find the intersection of two sets S and T, use S intersect T ().

You will find that lists are some of the most flexible and powerful objects in Mathematica. ... replace the element at position i in list with new.