Questions tagged [searching]
The searching tag has no usage guidance.
106
questions
1
vote
3
answers
245
views
How to find the nearest string to another string in a mixed array
I am trying to find which string is nearest to another string in an array of numbers and strings. For example, say I have an array that is as follows
...
- 45
11
votes
3
answers
179
views
Faster searching for subsets with pairwise conditions
I am looking for a faster way of finding large subsets of lists that obey pairwise conditions. In particular, I'm looking for a large (over 10k) set of quaternary words (i.e. ordered lists) of length ...
- 30.3k
1
vote
2
answers
73
views
How to search a directory of nb files for a string?
I would like to find a particular string in a set of nb files in a directory but am having problems interpreting the results of my code. Here's a simple example:
In directory d:\mathematica, I have ...
- 1,094
0
votes
0
answers
47
views
How to search exact product title with ServiceExecute
I am trying to find the exact product title having phrase "HEPA filter bags" on "amazon.com" but it doesn't return the correct result.
...
- 125
0
votes
0
answers
50
views
Finding minimum in a list of lists
Imagine I have the following list
{{0, {2,3}}, {-1, {5,3}}, {2, {2,6}}, {5, {5,0}}, {0, {1,1}}, {-2, {10,2}}, {3, {4,2}}};
I want to pick the element in the list ...
- 4,138
3
votes
1
answer
37
views
Position doesn't work for custom symbol within package
In a notebook, I can easily search an expression for a custom symbol.
In[237]:= Position[{mySym, 1, 2}, mySym]
Out[237]= {{1}}
However, if I write a function and ...
- 750
0
votes
1
answer
137
views
Implementing an optimization algorithm in WL
I am trying to implement the Jaya optimization algorithm (Jaya). This is a flowchart from the Author 's webpage showing the details of the Algorithm.
Note that there is a typo in the equation in the ...
1
vote
1
answer
80
views
Pattern Matching in 2-dimensional lists
How would I search for all the elements in a nested list which contain values at specific index? For example, I want to search for and return all the elements in a (n,2) list which begin with a 3 ({3, ...
0
votes
1
answer
101
views
Import structure from Matlab into Mathematica 12 and nested lookup
I use Matlab and generate data that I save in a structure in a MAT file. I want the results to be loaded into Mathematica, as several analysis and plots are best when done in the latter than in the ...
18
votes
1
answer
343
views
Intelligent text search on large directories of notebooks?
I have a (deeply nested) directory containing 10s of thousands of wolfram files (mostly notebooks (nbs), but also scripts (.wls), packages (.m, .q
wl), my and wxf data) and many subfolders each with a ...
- 30.3k
2
votes
3
answers
198
views
Cases do not pick up Sqrt?
I'm trying to understand how Cases work in Mathematica, and I'm a bit curios why i't wont pick up the Sqrt function?
Consider the following expressions
...
- 155
0
votes
1
answer
31
views
Search for terms contatining error functions
question might have an answer in this post (Efficient Search for specific Terms in symbolic Expression) but i don't understand how to convert it to my specific case
Through some definite integrals I ...
- 155
2
votes
2
answers
92
views
Finding Mnemonics for expressions with lots of indices
One of the equations I work with in my research are the pentagon equations:
...
- 928
3
votes
1
answer
178
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 ...
- 789
9
votes
2
answers
665
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 ...
- 20.4k
2
votes
1
answer
75
views
How to search for special `ResourceFunctions`
In Mathematica there exist several very useful Resource functions , for example ResourceFunction["MeanCurvature"] and ...
- 36.4k
3
votes
2
answers
135
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 ...
- 1,303
0
votes
1
answer
43
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
...
- 2,225
0
votes
1
answer
50
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 ...
- 14.8k
2
votes
1
answer
275
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 ...
- 21
2
votes
2
answers
63
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 ...
- 175
4
votes
3
answers
457
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 ...
7
votes
4
answers
770
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.
...
- 183
1
vote
1
answer
72
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 ...
- 1,459
0
votes
1
answer
69
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 ...
- 265
5
votes
2
answers
456
views
Implementing a Better Grep Command
In Working With String Patterns, Wolfram documentation yields a simple Grep function:
...
- 2,975
6
votes
4
answers
355
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 ...
- 8,105
3
votes
3
answers
160
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 ...
- 951
4
votes
3
answers
99
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:
...
- 71
4
votes
3
answers
183
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 ...
- 11.5k
2
votes
0
answers
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 ...
- 471
2
votes
0
answers
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?
- 238
3
votes
0
answers
203
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 ...
- 30.3k
5
votes
4
answers
510
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:-
...
- 3,564
0
votes
1
answer
46
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 ...
- 1
0
votes
1
answer
552
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 <...
- 1
5
votes
1
answer
112
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 ...
- 30.3k
7
votes
1
answer
151
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 ...
- 30.3k
0
votes
2
answers
54
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,...
- 277
0
votes
1
answer
32
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)
(...
- 277
4
votes
4
answers
191
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 (...
- 1,665
4
votes
0
answers
190
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 (...
- 2,371
6
votes
4
answers
329
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 ...
- 411
2
votes
2
answers
150
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 ...
- 2,062
10
votes
1
answer
355
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?
- 45.4k
2
votes
0
answers
112
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 ...
- 4,974
4
votes
2
answers
318
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 ...
- 349
3
votes
0
answers
60
views
How to find where in a large expression Power::infy is generated?
Consider the following expression:
...
- 6,912
2
votes
2
answers
120
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
...
- 987
7
votes
3
answers
324
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 ...
- 817