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Questions tagged [nest]

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1
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3answers
76 views

Sum with variable terms to sum over

Suppose I have a polynomial like this: $$a=x_{j_1} + x_{j_1}x_{j_2} + x_{j_1}x_{j_2}x_{j_3} + ...+x_{j_1}x_{j_2}x_{j_3}...x_{j_n}$$ I want to create a function that takes this polynomial and does the ...
0
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1answer
53 views

Variable nesting depth inside table

I hope my title makes sense. The idea is the make a function in which a set of variables, $l_1$, $l_2$, etc. are accessible inside the innermost body of a nested (/folded) function. Each of these ...
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0answers
37 views

Generating GIF animations of nested Manipulate expressions

I have a quick and dirty function that I use a lot for generating interfaces for internal demonstrations: ...
2
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1answer
81 views

Can I use Nest iteration variable as the variable of Limit?

Can anybody tell me what is wrong with this: Limit[Nest[1/(1 + #) &, x0, n], n -> ∞]
2
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2answers
75 views

nested commutators

I have defined the commutator between two matrices as comm[A_,B_]:=A.B-B.A I have defined the nested commutator as ...
3
votes
2answers
278 views

Efficient implementation of Non-Maximum Suppression

I would like to know is there is a way to do this: ...
2
votes
1answer
38 views

NestWhile and infinite loop

Obviously, the following code leads to an infinite loop: ...
1
vote
2answers
80 views

Reproducing Nest-function with recursive nesting does not work

In general, when I am learning a new programming language, it helps me to understand how builtin functions works. I am trying to reproduce the builtin Nest[f,exp,n] ...
0
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0answers
83 views

How to give a function multiple variables in a mapped and nested list?

I come from python (not advanced tho), and have been learning mathematica. I'm currently struggling with the following code: This is a basic version of what i wanted to implement: ...
5
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3answers
172 views
7
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2answers
275 views

Using Nest to build continued fraction

To build basic continued fraction one can simply use: Nest[1/(1 + #) &, x, 3] However, it's unclear how using Nest ...
5
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2answers
49 views

Removing from a sublist, inserting into another one

From a list like test = {{1, 3}, {2,7, 8}, {5,6}}; I would like to randomly select k elements, lift them out of their current ...
9
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6answers
562 views

Delete repeating elements across sublists

I have a list like this test = {{1, 3, 5}, {7, 2, 8, 5}, {7, 1, 3}}; The list is guaranteed to have duplicates only across sublists and not within. I would like ...
0
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2answers
165 views

Reducing the computation time used by parallel table when finding a fixed point

I am using Intel Core(™) processor, 32 bit operating system, 4GB RAM, Windows 7. I am running the following code and it is taking hours to obtain the result. Can any one help me in improving the codes ...
3
votes
2answers
71 views

Join nested lists if first element is within another list

I have a list like: list1={{1, 16}, {1, 14}, {1, 3}, {1, 18}, {1, 2}, {1, 17}, {2, 17}, {2, 18}, {3, 14},{4,10}} I would like to see if the first element of one ...
0
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0answers
72 views

Dummy variable in nested integral operator

I am trying to make a nested integral operator where the output function of one step must be applied to the dummy variable to be integrated in the next step. Here my code: ...
0
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1answer
111 views

nest non pure function

I have a problem to nest a non pure function.The function f has two arguments, i and j, it ...
9
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5answers
914 views

Simple Birth Death Process

I am trying to implement simple birth death process. Why my code does not work? Any suggestion. Thanks. Cross posted http://community.wolfram.com/groups/-/m/t/1205656 ...
2
votes
2answers
213 views

Use Nest in a recurrence function

I have following recurrence function: ...
1
vote
3answers
352 views

Pass function or expression as argument to be evaluated

I'm trying to create a function using Nest, which will use Newton's method to find the root of the passed function (or even the passed expression). I've got this, which won't work obviously. ...