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Learn to use some of the thousands of functions that work on lists in the Wolfram Language. Work with individual elements. Written by Stephen Wolfram.

'Map' represents classic functional programming way to apply a function to each element of a list. http://en.wikipedia.org/wiki/Map_(higher-order_function).

Is there method to get indices of certain elements of list Wolfram Mathematica ?. For visualisation of problem say I have two list, ...

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 ):

Position[{2, 4, 6, 8, 10}, _?(# > 7 &)] does the job. Apply Flatten[] if need be. As noted by Dan in a comment alluding to Brett's answer, using the ...

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.

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.

Say I have a list x= {2,4,6,8,10} and I want to find out the positions of the elements that are greater than 7. Select [x, #>7&] gives the elements themselves, and Position [x,8] gives the position of the elements satisfying one of the possible criteria, but what I am looking for would be a mix of the two returning {4,5}.

Mathematica also has functions that search and test for elements of lists, based on the values of those elements. Position[list, form] the positions at which ...

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.

19.12.2014 · Show activity on this post. Write a snippet to calculate the mode (most common number) of a list of positive integers. For example, the mode of. d = [4,3,1,0,6,1,6,4,4,0,3,1,7,7,3,4,1,1,2,8] is 1, because it occurs the maximum of 5 times. You may assume that the list is stored in a variable such as d and has a unique mode.

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:.

Aug 27, 2011 · Select goes over all the elements of the list, and therefore will take time which is linear in the length of the list. Since you say the list is ordered, it is much better to use BinarySearch, which will work in a time which is logarithmic in the size of the list.

Extract all elements except the outermost rows and columns (negative indices count from the end): Copy to clipboard. Is Mathematica zero indexed? Sometime there is a need to start the index of an array or a list from zero , as this can be more natural.

Say I have a list x= {2,4,6,8,10} and I want to find out the positions of the elements that are greater than 7. Select [x, #>7&] gives the elements themselves, and Position [x,8] gives the position of the elements satisfying one of the possible criteria, but what I am looking for would be a mix of the two returning {4,5}.

Learn to use some of the thousands of functions that work on lists in the Wolfram Language. Work with individual elements. Written by Stephen Wolfram.

13.12.2011 · I have a list and I want to apply a logical test to each element, and if any one of them does not satisfy this condition, then return false. I want to write this in Mathematica or find a built-in function, but seems ForAll does not actually do that.. My question is: …

Parts of Lists. Part lets you pick out an element of a list. [ [ ... ]] is an alternative notation. You can ask for a list of parts by giving a list of part numbers. ;; lets you ask for a span or sequence of parts. Let ’ s now talk about lists of lists, or arrays. Each sublist acts as a row in the array.

31.05.2002 · In Mathematica this is accomplished with what is known as a list. A list, in Mathematica, is a collection of objects that is separated by commas and grouped by braces. Thus, if x1, x2, x3 , ..., xn is a collection of objects, then we can form a list of this collection in Mathematica by means of the command {x1, x2, x3 ,..., xn}

... 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.

I have a nested list of the type: {{1, 2, 3}, {1, 2, 4}, {1, 1, 2}} I want to find the number of sublists in which the first two elements ...

Pick out elements 5 through 8 of the list: How do you make a loop in Wolfram Alpha? Looping Constructs. Do — evaluate an expression looping over ...

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.

20.11.2016 · Give the definition of nth which returns the nth element of a list. For example nth(X,3,[a,b,c,d,e]) returns X = c. I couldn’t figure out how to solve this and the closest solution I …

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.