All Questions
Tagged with strings or string-manipulation
1,315 questions
2
votes
1
answer
86
views
Convert tikz (in tikzit) code to a graph in Mathematica
I want to convert a TikZ graph from TikZiT into a graph in Mathematica. I want to retain the vertices, edges, and the positions of the vertices. As for the color of the vertices or the style of the ...
- 2,091
3
votes
2
answers
152
views
StringTake :Cannot take positions 1 through 1 in
Here is the code that aims to figure out first letter of each sentence in a string of text:
...
4
votes
0
answers
76
views
Why is MatchQ faster than StringMatchQ in testing string matches?
Suppose I have myStrs, a list of one million alphabets (i.e., 26 million single-character strings):
...
- 10.5k
0
votes
2
answers
43
views
Why bar chart starts on the x axis leaving a gap in the first unit
BarChart[StringLength[StringSplit["A long time ago, in a galaxy far,far away", ","]]]
While I can follow the reason for three bars as there ...
3
votes
2
answers
141
views
OrderlessPatternSequence for StringExpression
I am using v12.2.0. As a minimal example, the idea is to find all words that have two pairs of matching characters and two other characters for a total of 6 ...
- 59.3k
3
votes
3
answers
308
views
I need an MMA function to convert two lists like {0, r} {s, 0} in one list of rules {0->"s","r"->0}
I need a Math. function to convert two lists like {0, r}
{s, 0} in one list {0->"s","r"->0}; I.e. the letters must be enclosed in " ", but the numbers not. I have ...
- 2,166
3
votes
1
answer
165
views
Convert a list of strings of the form {{2 "x" +"y"->4 "x" + 5"y"},{5 "x" ->7"y"}, ...}, to {{"2 x +y"->"4 x +5 y"},{"5 x" ->"7 y"},...}
Convert a list of strings of the form
{{2 "x" +"y"->4 "x" + 5"y"},{5 "x" ->7"y"}, ...}
to
...
- 2,166
1
vote
1
answer
55
views
Draw a graph on vertices inputted as "A"+ 2 "B", 3"A" + 4"B", etc (the input form is imposed) in Euclidean space, with A->(1,0), B->(0,1)
I have a Mathematica script, called FHJ, with four main arguments: vertices, edges, weights of edges, groups of vertices, which produces a graph with vertice labels given in the list vertices, ...
- 2,166
5
votes
4
answers
390
views
Elegant way to examine a string by "word" (whitespace-delimited substring)
Suppose I have the following list of strings myStrList:
...
- 10.5k
2
votes
4
answers
142
views
Creating a string pattern to specify a single letter character, which is lowercase, without using LowerCaseQ
I'm running quite an old version of Mathematica: version 9.0. I wish to create a function oneLetterLowerCase that takes a string ...
- 10.5k
3
votes
1
answer
128
views
Converting a set of reactions represented by strings separated by spaces, or by newline, to a list of similar strings
In the Macaulay package ReactionNetworks.m2, a set of reactions is represented as
{AB1-->B+C
C2-->D}
with new line separating the first reaction AB1-->...
- 2,166
-1
votes
1
answer
89
views
A string with mathematical operators (fractions, superscripts, subscripts, etc.) and a variable number [closed]
I want to create a list in Mathematica where a word contains a number that changes within it. However, I want the number to appear as a superscript or subscript or in a fraction etc. How can I do this?...
- 235
1
vote
0
answers
48
views
Replacement of strings within lists
i have a string list:
lis = {"a",{"b","c"},"d"}
...and would like to replace "c" with "Q", to give
<...
- 5,025
1
vote
1
answer
32
views
StringReplace with several replacement rules doesn't work as expected
I understand that, according to WL documentation, StringReplace["16.",{aux:NumberString:>"1/"<>aux,".":>"*3/2"}] ...
- 11
3
votes
2
answers
112
views
How to specify that case should be ignored within a string pattern?
One can use StringMatchQ to test whether a string matches a string pattern. One can use the IgnoreCase option of ...
- 10.5k
3
votes
3
answers
241
views
Inserting a 0 in Specific Symbols
I have a very large network with 1000's of edges. Below is a small sample. The N is my label for Node and the number that follows is a unique identifier. I want to make all the edges on either side of ...
- 1,837
1
vote
1
answer
144
views
I want to plot the group delay of the following mathematica code but it takes too long time
I am working on a Mathematica project where I want to plot the group delay. The problem is this code is running too slow. Is there any possibility of speeding up the code?
Here is the original code:
<...
- 27
0
votes
1
answer
59
views
How to convert strings to the same pattern
I have some sets of random strings. These strings may have one of the special characters (+,-,=) as a prefix or suffix, or both. Different special characters cannot be mixed in the same set.
I want to ...
- 1,361
0
votes
1
answer
45
views
General::tag weird behavior
Is there anyone here who can explain this strange behavior? Consider the following code:
...
- 91
3
votes
4
answers
106
views
Randomly replace some letters in words with hyphen
I have a list containing some related words
...
- 679
2
votes
1
answer
85
views
Internal`MRealToString Gives Scientific Output From Large Inputs. How To Stop This?
The undocumented Internal`MRealToString works just fine for reals up to 999999. For anything over it outputs scientific notation. I don't need scientific, I need simple decimal.
...
- 1,193
7
votes
3
answers
256
views
2
votes
3
answers
155
views
2
votes
1
answer
38
views
StringJoin fails in .m
Do[(
ND$T$thr[j] = j;
ND$T$thr[j] >> "test_" <> ToString[j] <> ".dat";
), {j, 1, 3}]
This works without issue in a ...
- 143
3
votes
3
answers
127
views
Extract doi from a text string
I have a large list with bibliometric information including the doi like this example:
...
- 771
4
votes
3
answers
365
views
How to express the notion of "from "a" to the nearest "z"" with patterns?
If I compute this:
StringCases["abczabvncz", "a" ~~ __ ~~ "z"]
It yields:
...
- 5,573
1
vote
1
answer
83
views
All possible tuples satisfying conditions
Let $\beta = (\beta_1, \beta_2, \ldots)$ be any given sequence of non-negative integers with all but finitely many $\beta_i$ zero. I want to collect all possible tuples $\beta^{\prime}= (\beta_1^{\...
0
votes
2
answers
94
views
Is it possible to have ToString operate on an expression containing Prefix (@) ? for example exp = [email protected]
ToString[exp] results in the string form of the evaluated form of exp when exp contains Prefix (@), such as when exp is an email address. How can such an expression be converted to a string?
3
votes
5
answers
190
views
Importing Specific Data from a Text File
I am quite new to Mathematica. I have a text file that upon importing has a repetitive structure with characters included. I need to extract only the following in numbers only (no letters, dash lines, ...
- 33
5
votes
4
answers
247
views
Select elements from a list based on alphabetical order criteria
I have this code to generate the anagrams for a 6 letters word:
...
- 1,544
2
votes
0
answers
80
views
How to convert the <table> element into Grid
I got the html source code for this element for this page in Wikipedia:
...
- 27.2k
0
votes
0
answers
58
views
How to convert RowBoxes into list of math expressions?
I have following RowBox which represents Step By Step solution of undefined integral
...
- 1
0
votes
0
answers
36
views
Coverting .nb file code content to string type using NotebookImport
For my work I need to import the notebook and get all the contents from the code cell. For this task I chose ...
2
votes
1
answer
53
views
Intra-Symbolic Wild Card Pattern Matching
I have the following custom expression structure I am parsing:
Theorema`Knowledge`Q$TM[
Theorema`Language`VAR$[Theorema`Knowledge`VAR$x$TM]]
I already was able to ...
3
votes
4
answers
177
views
Sort Column as a Row
I have
a = {1, 2, 3, 10};
b= {2, 3, 4, 8};
t= Do[If[a[[i]]+b[[i]]>3,Print[a[[i]]],"No"],{i,1,4}];
2
3
10
I need to get the result; t={2,3,10}
- 107
7
votes
3
answers
277
views
Replace number in string with ? and /;
I am trying to make the following:
StringReplace[{"A4", "A#3"}, {"A" ~~ x_ -> "B" ~~ x}]
This should replace ...
- 5,573
3
votes
0
answers
65
views
How to improve Burrows-Wheeler Transform performance?
I have implemented the Burrows-Wheeler Transform as below:
...
- 25.9k
0
votes
0
answers
72
views
How to convert LaTeX to expression without interpreting variables as products?
I need to convert some LaTeX code to mathematica expressions. So far I have used
ToExpression["ab", TeXForm]
yielding ...
- 268
1
vote
1
answer
47
views
Why is StringSplit dropping empty entries? [closed]
I am parsing a CSV and whenever the trailing records are empty:
StringSplit[",2,,4,,",","]
I get:
{"2&...
- 9,751
1
vote
0
answers
134
views
Butterflied Strings Shortest Character Solution
The shortest character solution for Butterflied Strings on Wolfram Challenges according to the CODE CHARACTERS functionality is 40. I have a solution with 42 ...
- 171
0
votes
1
answer
62
views
Pattern matching with DeleteCases
I'm using Mathematica 14.0 and I'm having a pattern match problem with DeleteCases. The example below illustrates the problem. I define a test string followed by two patterns that both nominally match ...
- 1
3
votes
2
answers
114
views
Writing Mathematica code for putting in commutation relations in a string
I am trying to write a mathematica code to accomplish the following:
For a given $n$, consider $(ab)^n$, which is a string of the form $\underbrace{ababab...ab}_{n\text{ times}}$.
I want to replace $...
- 133
1
vote
1
answer
71
views
Compressing a file's name string
I was working with files where each name records a lot of information about what is in its respective file and wanted to compress it a little bit. So I wanted to change it's 'base'.
And I noticed that ...
- 74
2
votes
3
answers
237
views
The problem of matching consecutive cross-line strings
I have a file named "s0.log",There's a lot of this structure in there:
You can see that the strings "Alpha occ.eigenvalues --" and "Alpha virt.eigenvalues --" will be ...
- 1,630
1
vote
0
answers
68
views
Why is SequencePosition or SequenceCases so slow on large lists?
I observed that SequencePosition or Sequence Cases on a list of around 60'000 digits is so slow that I had to sort out to string pattern matching.
Is this normal behavior or should Wolfram have a look ...
- 121
3
votes
5
answers
292
views
3
votes
1
answer
127
views
Behaviour of `ToExpression` inside a function definition
I want to create a function that takes in an array of unknown size and do some index operations on it. I am using strings to construct the expression and then trying to use ...
3
votes
5
answers
150
views
Sorting logic and generation of letter sequence
In the context of experimental designs, it is common to generate the various treatment names to build the factorial design table.
The table of the 2^2 design reads :
For the 2^3, the table reads :
...
- 754
2
votes
1
answer
62
views
FromLetterNumber and "" bug or intended behaviour
DigitQ behaviour appears consistent
"" is treated as 0 by DigitQ`
...
1
vote
1
answer
74
views
Difficulty using StringCases to obtain desired substring
I have extracted and stored some plaintext strings (derived from a pdfs) from the web that I wish to search for various values following certain text substrings that are different for different ...
- 1,975