Questions on the manipulation of String objects in Mathematica, and the functions used for these manipulations.

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8
votes
1answer
135 views

CSS Selectors for Symbolic XML

Symbolic XML is a convenient way of managing XML in Mathematica, at least for casual use or small tasks. Here and elsewhere you can find examples of XML handling in Mathematica, including XSLT/XPath ...
2
votes
2answers
77 views

Alternative to Except in StringExpression when using StringMatchQ

According to this answer and the documentation for StringExpression, Except can only be used in StringExpression for classes of ...
0
votes
0answers
18 views

How would I take a variable from a string and reassign its value? [duplicate]

If I have string={a,b,c}, where a=1, b=2, and c=3, how would I reassign a value to variable "a" without directly typing a = _? If I type string[[1]], the out put is "1". How would I generate the ...
1
vote
1answer
60 views

ToExpression and Fortran notation

ToExpression["9.0E-03"] interprets String as 9*e - 3 instead of what I am expecting ...
3
votes
2answers
120 views

Converting unevaluated lists to strings

I have a list like l = {2 - 3, 12 - 4, Times, aab} I want to end up with {"2-3", "12-4", "Times", "aab"} I have tried ...
4
votes
1answer
168 views

Selectively converting numerical strings to expressions

I have a list of strings representing different types of data ...
2
votes
3answers
251 views

Treat strings as variables?

I have a list of strings, {"x1", "x2", "x3", "x4"} And a list of linear equations: ...
0
votes
0answers
41 views

StringCount in Mathematica

StringCount["one letters three letters letters one letters letters three letters", "one" ~~ __ ~~ "three"] gives 1 because ...
2
votes
1answer
54 views

How can I automatically name files being exported based on input parameters

I have Mathematica notebook that performs some operation say a=2 b=3 c=5 d=4 how do I set the output file after evaluation to be named using the values ...
2
votes
1answer
59 views

StringExpression: pattern reapeted one or more times matches pattern repeated zero times

I try to construct patterns using Riffle and Except StringExpression@Riffle[{"a", "b", "c"}, Except[{"=", ","}] ..] and expect it to match "a_b_c", but not ...
4
votes
1answer
102 views

Converting string representation of boxes into explicit boxes

It is very easy and convenient to write textual labels as Strings in the WYSIWYG mode. For example, I define a short form describing a linear model: ...
10
votes
1answer
245 views

StringReplace, ReplaceAll and Rule interact in a bizarre way

I have the following pair of things: ClearAll[foo, labeledFoo]; labeledFoo = {"FooBarBazQuux", foo}; This works like you'd expect: ...
2
votes
1answer
168 views

Generating the set of all strings within a fixed edit distance of a initial string?

Provided a starting string initialString, and a particular alphabet of allowed characters {"A","B","C","D","E",...}, how can I ...
3
votes
2answers
96 views

Finding all instances of length $N$ common subwords in two strings

Given a pair of strings, I'd like to return a list of all common subwords of a fixed length of "n" characters (i.e. contiguous subwords of length "n" that occur in both strings), allowing for ...
4
votes
1answer
89 views

What string pattern will match $n$ contiguous characters drawn from a given alphabet?

I'd like to use StringCount to count the number of subwords in a string that have the form **** where ...
0
votes
0answers
78 views

Read in bezier curve from svg file

I am trying to do some calculation of some svg file,After read in with Import["filename","XML"]and some easy operation, I can get the string of the bezier curve, ...
4
votes
2answers
137 views

Counting the number of instances of one sub-string within a given string within a lower- and upper-bound gap of a second sub-string

Please consider the situation where I give you a list where entries are drawn from a fixed set of characters: ...
3
votes
1answer
124 views

How can I get precise frame rates in dynamic?

I've been the Spritz sdk in my ios apps, and I love it. For funsies I wanted to see how much less code a mathematica version would take! Using dynamic I get a nice result, shown below in code. ...
30
votes
9answers
4k views

Programming paradigm change

I'm new to Mathematica, I've been learning by myself, and, being a Java developer for some time, it makes it hard to adapt. I've tried to solve a Reddit challenge, and I came up with this solution: ...
2
votes
1answer
59 views

Reversibly abstracting a list of strings as a graph object where vertices represent strings and edge connect pairs of strings based on various tests

Imagine I provide you a list of arbitrary strings, say: Map[StringJoin, Tuples[{"0", "1", "2"}, 4]]. I'd like to abstract these strings as a graph object in ...
2
votes
3answers
135 views

String formatting

I have the following string: "174,861.00 ( 4,053.52) 206,850.48 118.29 ( 31,989.48)" Parentheses stand for negative numbers. I will like to get ...
1
vote
1answer
142 views

How do I use wildcard characters with StringTake?

Say I'd like to pick substrings from some string such that these substrings have the pattern @@@q@@@, where @ is used here as a ...
1
vote
2answers
93 views

Decomposing a large text file, with alternating headers and text, into an array of headers and an array of text segments

I have a very large text file, test.txt, in the following format: ...
3
votes
1answer
187 views

Importing a Base64 encoded string

everyone, I'm handling some paragraphs enconded with Base64 from CSV file format. The problem is that Mathematica can't decode it. It seems Mathematica Encode/Decode their own Base64. I'm thinking ...
2
votes
2answers
144 views

Highlighting or coloring certain words / substrings appearing in a larger string

I have one longer string, longString, and a set $S$ of shorter strings {ss1,ss2,ss3,...}. I'd like to print out ...
1
vote
2answers
200 views

Deleting all characters in a string that do not belong to a small set of elements

Say I have a string {100 aa bbc%j%b%wa ajjcj11j0%2wj fc} with a lot of undesired characters or spaces in it, for example: {" ", "%", "w", "j"}. I'd like to strip the string of these characters, with ...
1
vote
1answer
63 views

using deletecases for twittermessages using the timestamp

I have a Excelsheet with tweetsmessages. These tweets are all written in Dutch. I would like to analyse these tweets in relation to the timestamp. ...
0
votes
2answers
167 views

Convert epoch seconds to date [duplicate]

I have got the following datetime from an API: 1395401384298 I am guessing it is in epoch miliseconds time (it should be one day in 2014) How can i convert it into a more readable String? I have been ...
5
votes
5answers
393 views

Joining some strings in a list of strings

So, say I have a list of strings, representing lines in a file, like so: ...
4
votes
1answer
147 views

How to differentiate between formatted and unformatted strings?

StringQ returns True both for unformatted and internally formatted strings. To get True only for unformatted ones I have thought up the following function stringQ. Please, can you point out ...
0
votes
2answers
89 views

ToExpression an array

I have a .dat file. I would like to convert a big array of strings(that's what I havein the .dat file) into an array of numbers, for example ...
1
vote
2answers
95 views

How to switch between a binary number as String and a as a list of digits?

I was trying with String Functions and I viewing any posts and have no results I want to know 1.- From cromo33 = Table[RandomInteger[], {i, 1, 33}] cromo33 ...
0
votes
1answer
52 views

Replacing whole strings

I imported a text and seperated al words by using StringCases. After this I would like to manipulate the text, for example to replace all singular verbs to plural. ...
11
votes
5answers
2k views

What is the fastest way to extract a substring from a huge string?

I develop an algorithm to find the most common substrings of a given length n up to a certain distance l in front of a pattern p in a huge sequence S. E.g. I want to find the most common hexamers ...
2
votes
1answer
68 views

How to put Labels in of a list of number in a chart?

I can´t put the labels 0,....,31 in this simple chart on the usual place, or better just over the Top of each bar How should I do? ...
5
votes
2answers
161 views

Using StringCases and treating certain phrases as single words

My question is about StringCases. When I use this function, each word is separated by a ,. But I want some noun phrases like ...
3
votes
3answers
235 views

Removing non-word characters from a string

I'm trying to get a list of words from a string. Sounds like an easy task for Mathematica. I have the following code: ...
0
votes
1answer
200 views

Importing data to make a DateListPlot

I am having a hard time trying to import some text data for later use in DateListPlot. My first field in my data is a date of the format "yyyymmdd". I tried to ...
3
votes
1answer
347 views

Paste letter grades B+ , C-, A, B into notebook and not get B+C-AB

I have worked for two days to find a way through this problem. I am porting my student grade records into Mathematica from spreadsheets, or sometimes from my college web sites, or sometimes from my ...
3
votes
3answers
313 views

Insert a linebreak and character repeatedly into a very long string

Suppose I have a very long string ...
0
votes
1answer
81 views

Generalizing Characters to n-character substrings [duplicate]

I'm doing some frequency analysis on an encrypted plaintext. Tally[] and Characters[] make the basic task quite easy. To count the number of times each character appears (sorted alphabetically; ...
3
votes
1answer
152 views

String pattern matching in function definition

I have a function f and its downvalues. I want to code an extra downvalue for arguments of the form "part1:part2" I don't understand why ...
3
votes
2answers
117 views

How do we make a negative integer out of a string of a negative number and vice-versa?

Negative numbers are not taken into consideration by mathematica's built-in functions. FromDigits["-2"] Gives me this message: ...
0
votes
3answers
116 views

string to complex number

Consider the following list MyList= {-0.0000396, -0.0000187167, "0.10259130990561813-0.0677132394802944i"} Head /@ MyList (* -> {Real, Real, String} *) In ...
0
votes
1answer
273 views

Extracting coefficients from multiple equations and generating coefficient matrix

after 6 hours reading about string patterns, string manipulations and trying ..and trying..I officially give up (for now) and ask for some help. I have some unorderly equations you will find here ...
5
votes
5answers
336 views

Isolating characters in a string

I'm struggling to find the right function in mathematica to isolate specific characters in a string. I have got a formula as string (I imported it from an excelfile) like this: y = 0.97*x1 + ...
4
votes
3answers
204 views

Reading binary strings from file as strings

I have a file that contains binary strings like 01011 00101 01011 I want to import the file to Mathematica as a list of strings, but ...
6
votes
3answers
695 views

neighbor swapping distance between two strings

Updated Problem Description I have a collection of strings $S$ that only contain two (or $m$ in general) kinds of elements: in this case C and D. For all $s\in S$, the length is the same, the number ...
2
votes
3answers
179 views

Counting instances where the two identical characters are at the same positions in two strings

Let $s_a$ and $s_b$ be two strings over a $q$-ary alphabet. For each character $(c_1,...c_q)$ in the alphabet, I'd like to return a pair of values $(r,k)$ where $r$ represents the count for the ...
6
votes
4answers
176 views

Generate list of strings from a list of assigned variables

How do I generate a list of strings from a list of assigned variables? Eg. Convert ...