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2
votes
2answers
58 views

Finding Mnemonics for expressions with lots of indices

One of the equations I work with in my research are the pentagon equations: ...
9
votes
1answer
331 views

Using Mathematica to find an alternative continued fraction for $\zeta(5)$

Given the Riemann zeta function $\zeta(n)$. I. $x=\zeta(3)$ Using Euler's continued fraction formula, we can form $\zeta(3)$'s cfrac as, $$Ax+B = \cfrac{1}{v_1 - \cfrac{1^6}{v_2 - \cfrac{2^6}{...
0
votes
0answers
24 views

Search in a Dataset

I'm new to mathematica and I'm struggling to search for a value in a dataset. I have a dataset consisting of pairs of two values. The import led to: name = Import["name.txt","CSV"] ...
0
votes
1answer
38 views

Searching across multiple notebooks for given list of functions / symbols

Is there a method to search across multiple notebooks for each in a given list of function or symbol name? The input should be a list of function or defined symbols, and the output would be an ...
3
votes
1answer
113 views

Find words in a messed up table [duplicate]

This table with a caption that said "First three words you see will come to you in 2021" inspired me to do some digging: Imagine that we have a table with randomly filled letters. How can ...
9
votes
2answers
375 views

Solving a rotating combination lock puzzle

The following puzzle appears in The House of da Vinci II and I thought it might be interesting to tackle in Mathematica: There are numbers marked on four rotating cylinders. These numbers must add up ...
5
votes
4answers
269 views

How to search within notebooks on Windows 10?

I have a lot of notebooks scattered in my downloads, documents and desktop folder. I have all the required locations on Windows indexing options but if I look at Advanced Options and File Types and nb ...
2
votes
1answer
51 views

How to search for special `ResourceFunctions`

In Mathematica there exist several very useful Resource functions , for example ResourceFunction["MeanCurvature"] and ...
7
votes
3answers
279 views

Find sublists in a list by contents, then union them

I want to find two sublists in a list by an element they contain, and then union them, keeping them in the list. I have this code that seems to do the job, but it seems rather clunky. Is there a ...
1
vote
1answer
246 views

Search for squares

Could anyone please help me find $a\left(x,y,z\right)$, $b_{i}\left(x,y,x\right),$$c_{i}\left(x,y,z\right)$ and $d\left(x,y,z\right)$ that are sums of squares of polynomials or rational functions such ...
3
votes
2answers
72 views

Find position of sublists containing a given element at nth position

I have a list of lists similar to this: L = {{"a", "b", "c"}, {"x", "c", "y"}, {"i", "j", "h"}, {"x", "b", "z"}} Each list within ...
0
votes
1answer
65 views

Search for certain entries in an expression

I have a list with large expressions. I would like to find certain functions and their derivatives by searching the list. The search outcome should be the functions/derivatives found only, not the ...
0
votes
1answer
38 views

Find parameter value for which sharply-peaked constrained 3d-integral equals 1

I want to find the value (desirably to high-precision) of the parameter $i$ for which the constrained 3d integration ...
2
votes
1answer
47 views

How to find the primitive Heron triangles with three rational angle-bisectors by MMA?

I'd like to find the primitive Heron triangles with three rational angle-bisectors. In a Chinese book, I saw these primitive Heron triangles with three sides no longer than 1000, but I'm not sure if ...
4
votes
3answers
410 views

How to find the position of the smaller element in the list

x = {4, 1, 2, 5, 6, 7} y = {1, 2, 4, 5, 6, 9} There are two lists x and y. How to find out these positions of the elements in list x are smaller than those in ...
10
votes
3answers
796 views

Extracting values with multiple keys

I want to extract sorted data from a huge database based upon two (or more) keys in a very timely manner. Here is a reproducible toy example for two keys only: ...
7
votes
4answers
647 views

Find elements of array with largest absolute value

I am wondering how to do in Mathematica the following: Given as an input a large array, I want to output a list of top $n$ entries with largest absolute value + their location within the array. ...
1
vote
1answer
68 views

How to test if $ⅈ$ is in an expression?

From this answer https://mathematica.stackexchange.com/a/9773/68791 and according to the documentation: FreeQ[list,form] test whether form occurs nowhere in ...
15
votes
2answers
576 views

How to find a specific error message?

Is there a way to find an existing error message in the System` context, that is used for a certain case? I want to include a message in a custom function that ...
5
votes
2answers
373 views

Implementing a Better Grep Command

In Working With String Patterns, Wolfram documentation yields a simple Grep function: ...
12
votes
0answers
220 views

Is it possible to search the web by image from Mathematica?

Is it possible to perform a web search based on an image input? There are several services that provide this: Google, Bing, TinEye, and maybe others. I am not sure which can be accessed ...
3
votes
3answers
122 views

Find element in a list matching a pattern (using wildcards)

Somehow, I did not manage to find anything related to that. Suppose, in my Global list of variables, I would like to make a search such that I obtain all the ...
4
votes
3answers
92 views

Subsequence Search

I need to parse some xml code. I need to extract some values withing pattern elements. I made an example of my trouble. Here is some complicated xml list: ...
4
votes
3answers
169 views

Find non-case sensitive string in a mixed list of elements?

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 ...
2
votes
0answers
41 views

Match an expression that has a descendant pattern

I have a complicated expression in which I have another expression p which, when it’s present, I want to match the outer expression and all of its children. I was hoping for something like ...
2
votes
0answers
55 views

Is there a way to cancel a search in Mathematica?

Is there a way to cancel a word search in Mathematica initiated via the Find and Replace menu?
3
votes
0answers
173 views

Approximate Nearest Neighbors in Mathematica?

Is there any support for Approximate Nearest Neighbors (ANN) in Mathematica or third-party packages? I'm looking for a good implementation of locality sensitive hashing for applications where ...
5
votes
4answers
462 views

Find permutation index

Firstly I wanted to find all the non-negative integer solutions for the following equation given the value of $k_{max}$ $$ k_1 +k_2 +k_3+k_4 = k_{max} $$ For this I use the following code:- ...
6
votes
4answers
324 views

Searching for an unordered triple in a list of triples

I have a list of triples which looks like this T = {{7, 1, 2}, {7, 2, 3}, {7, 3, 8}, {7, 1, 6}}; (I have suppressed a few triples for clarity. My real list is ...
0
votes
1answer
43 views

Problem using Position when using a variable [closed]

So, I tried to use Position to get the Position of the 90% Maximum of a Photodiode Signal. The code works when i directly use the solution of the .9*Max[...] solution, but I want to have it with a ...
5
votes
1answer
101 views

How to speed up a text search widget?

I have an InputField that searches a predefined list for matching strings and displays them in a TextGrid. But when the list is ...
0
votes
1answer
469 views

Using the binary search algorithm in a sorted grid

I want to get a mathematica code for binary search algorithm applied to a sorted grid containing integers. For example, given f[k_,x_]= x^2 + k x + k - 2 where <...
7
votes
1answer
144 views

How to cache results of WebImageSearch?

Every call to WebImageSearch costs money (wolfram service credits), thus, I would like to page through results without having to redownload them. Given the ...
0
votes
2answers
53 views

Looking for specific data in .txt file

I've the following code: Import["test.txt"] And it gives me: 1,10 2,20 3,30 4,40 5,50 6,60 7,70 8,80 9,90 10,100 11,110 12,120 13,130 14,140 15,...
0
votes
1answer
31 views

Searching in a .txt file for a specific time

I've the following code: Import["hoi1.txt"] And it gives me: "(time,voltage,current,power) (1,10,5,10*5) (2,20,6,20*6) (3,30,7,30*7) (4,40,8,40*8) (...
4
votes
4answers
180 views

How can one efficiently find the (x,y) values of the rectangles that enclose a chosen % of nonrandom data points in mathematica?

A half hour of searching for answers did not give useful results. This is typical data: I need to find the (x,y) values of at least 6 rectangles with one corner at (0,0) and the opposite corner at (...
22
votes
2answers
4k views

Determine whether some expression contains a given symbol

Given a symbol t and an expression expr, how can I determine whether or not the symbol t ...
4
votes
0answers
153 views

Extracting names (surname & family name) from unstructured text files

This question is about finding names of people in a text without knowing these people. There are some rules we can use to detecting names in a text A name consist always of two or more words (...
20
votes
1answer
943 views

NotebookFind and String Pattern Expressions

Is there a way that NotebookFind can be used to match string pattern expressions rather than just strings? The documentation for ...
2
votes
2answers
135 views

Efficient Search for reverse element in List of Lists

I have a big list AllCycles with contains lists of non-repeating integers (and the first element is always the smallest). I want a function ...
10
votes
1answer
339 views

How can I implement my own documentation search function?

The current documentation search doesn't allow for very sophisticate searching, can I write my own function to search through the docs?
12
votes
2answers
1k views

Efficiently searching a list for the position of the closest number to a specified number

Searching by closest and position I wasn't able to find an answer—but found Nearest by guessing. Nearest, however, returns ...
10
votes
4answers
1k views

Searching a phrase in all *.nb files

I have so many *.nb files in a folder. In one of them I have written a phrase, unfortunately I cannot remember that file. I am searching about it and the file in ...
2
votes
0answers
103 views

dynamic binary search

Suppose I have a time series of values $v_1, \dotsc, v_n, \dots,$ (think of the data as being generated by repeated function calls, like a Python generator, or being captured in real time) and I want ...
4
votes
2answers
264 views

Obtaining the position in a list where the i^th element is bigger than the (i+1)^th element

My question is very simple but I am not able to find the optimal solution. What I am trying to do is to have a function that give me the position in a list at which the value at position ...
3
votes
0answers
54 views

How to find where in a large expression Power::infy is generated?

Consider the following expression: ...
2
votes
2answers
111 views

Memoization and finding already calculated DownValue

The problem of plotting an expensive function discussed in this question caught my attention. As an exercies I tried to solve it using memoization as follows ...
1
vote
0answers
65 views

What can we do with the Dump contexts? [closed]

So we know from here what the *Dump contexts signify and here Rojo found a very useful goody that involves them: ...
5
votes
1answer
101 views

Code/Exp Search Documentation Center Mathematica

I have added several of my own applications to my Mathematica documentation center. Currently Mathematica uses followings notebook options to help the user search for specific functions. ...
7
votes
2answers
151 views

Display Documentation From Function

I would like a documentation function that works like that following. doc["search terms"] and it displays the list of search terms. And then ...