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

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3
votes
0answers
50 views

Why was StringRepeat designed so that StringRepeat[s, 0] throws an error?

I'm wondering about the rationale behind the design decision that leads to the following expression throwing an error: ...
8
votes
2answers
299 views

How can I use words/letters as pixels in an image?

I'd like to take the text of a novel or whatever and arrange it in a way that forms an image. Essentially recreating these works from Postertext. . I'm mostly looking for ideas regarding a ...
3
votes
1answer
69 views

Whitespace is lost during MathML -> XMLElement conversion

ImportString["<mtext> </mtext>", {"MathML", "XMLElement"} ] XMLElement["mtext",{},{}] while I'd expect: ...
0
votes
1answer
72 views

How to implement the for loop to replace text strings or texts?

I wonder define a bunch variables named like $X_1$, $X_2$, $...$, $X_n$. Is there some smart way to declare them instead of by pure typing. One trick I can image is to use the for loop,...
0
votes
2answers
116 views

How to make an Histogram where the data are strings? [duplicate]

Histogram[{3, 3, 2, 2, 2, 2, 2, 1, 1}] works great to give you an histogram in which mathematica counts the occurence of each number and makes the plot. Is there a ...
15
votes
1answer
231 views

Mma 10.2 `Alphabet` and `LanguageData` give different and both erroneous list of letters

Bug introduced in 10.2 and fixed in 10.3 The new function Alphabet introduced in Mathematica 10.2 gives the wrong list of letters for the Spanish language in my ...
2
votes
2answers
221 views

What's wrong with my palindrome finding function?

I'm trying to find the palindromes in the dictionary, but my output isn't giving me all of them. I have this so far ...
2
votes
0answers
34 views

How can I construct a string pattern from a list of patterns? [duplicate]

Is it possible to construct a string pattern from a list of strings? ...
2
votes
1answer
57 views

Braces in pattern with Cases function

Here's my problem: I've got a JSON-formatted response and want to match some variables over the response. I'm doing it using Cases: ...
4
votes
2answers
143 views

Printing every other line from input text

I am trying to do some text manipulation in Mathematica. After importing a text file (in.txt) as a string, how would you then output every other line? In the ...
14
votes
4answers
1k views

How to capitalize the first letter of each word in a string

The following examples only work for the first character of the whole string, but not of words. ...
2
votes
1answer
70 views

Having trouble modifying entry in a list

Hi, I am trying to create a small repository by entering three things as a list of string, namely the asp, sequence and description. The trouble that I am facing is that while I am manually ...
7
votes
1answer
149 views

How to get string representation of boxes in v10.2?

In Mathematica versions up to 10.1 we could get string representation of given boxes by passing them to ToString with InputForm: ...
0
votes
1answer
51 views

Avoiding misconversion of data with ToExpression function [closed]

I've got a list of data with the following structure which can be easily converted To expresion by some manipulation such as ...
13
votes
6answers
336 views

How can I mix the behaviors of StringReplace and ReplaceAll in a single rule?

I'm trying to take a list of the form { {"65 + 3 months", 75}, {"65 + 4 months", 75.1} }, and transform the string part to a number such as 65.25 or 65.333, ...
1
vote
3answers
101 views

Keep leading/trailing zeroes (like Defer except with numbers) in a given number

I'm trying to write a function that counts the number of significant figures a given number has so I can ensure my calculations are rounded correctly; however, I am having a lot of trouble preventing ...
5
votes
4answers
255 views

Finding relevant parts in XML document

My question is about a XML document and finding parts of strings. test = Import["C:\\Users\\filename.xml", "XMLObject"] This gives the following output: ...
5
votes
3answers
558 views

Finding all of the words containing certain letters

Is there a fast method to find all of the words containing the letters: {a, e, i, o, u, y}? I created an algorithm, but it takes more than 11 seconds to find all of ...
4
votes
2answers
105 views

Using parenthesized Regex backreferences in StringReplace

(I am sorry for my poor English,I'll try to use a simple sentence to convey me.) I can use StringCases to get the target to change like this ...
2
votes
1answer
66 views

Recurrence relation for multivariate polynomials

I am trying to define a function which recursively computes a polynomial associated to every binary string: ComputePoly[s_]:=(** Recurse on the string s**) For ...
1
vote
1answer
48 views

How to reference StringExpression named parts from a package without full Context path?

I have a long StringExpression in a package returned by a function. There are some named parts in the expression that I would like to reference when I use the ...
1
vote
2answers
54 views

Detect Mathematica operators eg. \[CircleTimes] in strings

I'm trying to detect all Mathematica operators/symbols (eg. [CircleTimes], [Colon], etc.) in strings so I can replace them with something else, how can I achieve that?
1
vote
1answer
40 views

FromDigits gives “not a list of digits” error for integer string in StringExpression rule of StringCases

I have large StringExpression that is used in StringCases. Some of the parts being pulled out are integer strings. These pull ...
1
vote
2answers
124 views

ToExpression and Fortran notation

ToExpression["9.0E-03"] interprets the string as 9*e - 3 instead of what I am expecting: ...
21
votes
1answer
605 views

How to strip all formatting from a string and convert it to plain text?

The documentation on String states: But if I try to perform some manipulations on this string, for example, take 2 words from the left, I get some shards of ...
7
votes
2answers
124 views

Strange Error on Fresh Kernel (10.2)

Bug introduced in 10.1 I wrote a helper function to format real numbers in a certain format for writing .dbf files here. It relies on a new function to 10.1 - ...
5
votes
1answer
182 views

Escaping multiline strings in Mathematica

I want to assign long multi-line strings in Mathematica. Is there a way of delineating a block without having to escape each instance of '"' with '\"' and each line ending with '\'? i.e. In other ...
2
votes
3answers
184 views

Problem displaying uppercase “I” in a string [duplicate]

It seems that Mathematica reserves the capital i, I, for the imaginary unit. I have the following expression: expr = a.b + II ...
13
votes
4answers
407 views

Unencoding encoded URLs in a function

Is there a built-in function for decoding encoded URLs in Mathematica? I would like to convert an encoded URL, for example ...
6
votes
4answers
281 views

Shorter shorthand for StringJoin[]?

As a minimal working example: myString="some words"; myString=myString<>"more words"; Is there a shorter way to tell Mathematica that I want to "tack on" ...
8
votes
1answer
168 views

Simple string pattern crashes kernel

Bug introduced in 6.0 or earlier and fixed in 10.1.0 The following code crashes my Mathematica kernel (v9, MacOS): ...
25
votes
1answer
319 views

StringCases is Confused with Patterns in Version 10.0.1

Bug introduced in 10.0.1 and fixed in 10.0.2 I observed the following with StringCases when trying to use rules/patterns. Here is a screenshot of the behavior: ...
6
votes
7answers
361 views

Convert array from {{…}} to “[[…]]”

I have made this function: conv01 = Map["["<>StringJoin@@Riffle[#,","]<>"]"&,Map[ToString,#,{2}],{0,1}]& to convert: ...
3
votes
1answer
196 views

Using Probability for n-gram string queries

I want to use Probability to ask questions on strings like "what's the probability of the occurrence of the trigram 'the' conditioned on the occurence of the digram 'th'?" This doesn't work. I ...
10
votes
1answer
262 views

How to change the font color of a variable in whole input cell

I want to track the occurrence of a particular variable in a code. So the idea is to change its color. Usually I do it in a crude way - convert the code into text and then use ...
21
votes
2answers
601 views

Why is TextString[-0.5] a positive number?

Bug introduced in 10.0 and fixed in 10.0.2 I want to format numbers in decimal notation and chose TextString for this task. But today, when looking at the final ...
1
vote
2answers
55 views

How to define a function `deriv[f[x]]` such that its output is an unevaluated expression `fx=D[f[x],x]`?

I want to define a function deriv[f_[x_]] such that when I run deriv[f[x]], the output is an unevaluated expression ...
35
votes
2answers
838 views

String-manipulation bugs in v10.1

Fixed as of 2015-04-06 via paclet update. The new version 10.1 has introduced some strange (possibly buggy) behaviour compared to v10.0: ...
2
votes
1answer
63 views

How to extract part of association?

Considering an association: asc = <|"a"->1, "b"->2, "c"-><|"e"->3, "c"->4|>, "d"->5, "e"->6, "f"-><|"g"->7|>|> How ...
4
votes
2answers
95 views

Usage of StringTemplate

The documentation for StringTemplate has the following example ...
5
votes
1answer
70 views

Export XMLElements with MathML contents

Setup Here's my mathML expression: mathML = ExportString[1/2, "MathML"] ...
3
votes
1answer
361 views

Decode a text which is encoded with UTF-8

I would like to decode a text which is encode with UTF-8. My code is here : ...
3
votes
1answer
59 views

Sort Unicode characters

Sorting ASCII phrases works fine: Sort[{"albatrob", "abo", "dict", "star", "mangel", "m"}] (*{"abo", "albatrob", "dict", "m", "mangel", "star"}*) But unless I'm ...
7
votes
1answer
75 views

A possible bug about WordCharacter on CJK characters

According to the documentation of WordCharacter: WordCharacter matches any character for which either LetterQ or DigitQ yields True. However, the results of the following code seem not ...
0
votes
1answer
34 views

How can I name to a saved file with the numerical values of some specific parameters? [duplicate]

I'm using some parameters to determine the elements of a list. I want to save this list with DumpSave, but I need to name it with its parameters. For example, I use the following parameters ...
2
votes
1answer
56 views

How to insert a character in a string with condition?

Considering we have a string: str = "1a 789 4/7 123/7 asff %$#7 478 9/4" How can I insert "/1" for the numbers that are ...
0
votes
1answer
43 views

StringJoin Dynamic problem [duplicate]

My goal is to import a XML file from the site fueleconomy.gov to get a list of cars dependent on the year given as the user input . Here is the code: ...
1
vote
0answers
21 views

Use functions to call a named object [duplicate]

Now I have several interpolation functions called x30, x50, z30, z50...... I wish to write a function to call these function by inputing x or z and numbers automatically, and assign a argument x to ...
10
votes
3answers
283 views

Mathematica equivalent to Python long raw strings? handling escape characters in packages

I'd like to write the following in plain text .m file in Mathematica, without having to double escape all the Latex commands: ...
0
votes
2answers
114 views

String quotes elimination

I'm trying to import a .csv file that contains some points which are geo-positions, but the import gives me the points wrapped in quotes. Is there any method to get them as pairs of real numbers? I'm ...