Questions tagged [parsing]
Questions about built-in/custom parsers or parsing techniques.
88
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Parsing of WL code
Upon opening a .wl file someone send me I noticed that about 20 seconds were spend parsing the file. Sometimes it spends less time doing so for much bigger files. Upon looking up the term "...
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2
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Parsing data from site
I try parse hub titles and links from this site: https://habr.com/en/hubs/, but code returns empty list. Can not understand why.
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172
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Input subscripts in Wolfram Cloud
I would like to input "rendered" subscripts in Wolfram Cloud, without having to verbosely type Subscript[a, b]. The local notebook shortcut is ...
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3
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2
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158
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Custom bracket parser
I have a function $F$ taking arbitrarily many arguments from ${a,c,z}$ where practically (technically it isn't) $a$ works as an opening bracket and $z$ as a closing. ($c$ stands for a value.) Double ...
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378
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How to create a CLI for Wolfram language scripts?
Former question: How to use wolframscript to develop flexible command-line tools?
I am currently changing a notebook into a wolframscript for a "production" environment,
where I plan to ...
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1
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How can I ingest and analyze benchmark results posted at MSE?
How can I ingest Mathematica / WL benchmark results posted at Mathematica Stack Exchange (MSE), like the ones posted here?
Assumptions:
There are multiple answers with benchmarks posted
The ...
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32
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Distinguishing function calls from multiplication when importing LaTeX via ToExpression and TeXForm
I'm trying to parse a LaTeX representation of a Desmos calculator (like this one) via Mathematica.
Desmos exposes a JSON representation of its calculators, including a LaTeX representation of ...
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1
answer
61
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Parse coefficients from a Resolve output
I have a huge output from Resolve (quantifier elimination) that I must parse to extract the coefficients as numbers. Take for instance something that looks like ...
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2
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179
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How to extract data and attribute data from an XMLElement
I am trying to write a function to extract both the data and the attribute data from an XMLElement in the same pass. I have followed the examples from Mathematica's Transforming XML tutorial and the ...
- 187
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votes
1
answer
166
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Reading information from a Portable Executable (.exe)
I want to extract information from executable files, such as the names and sizes of sections, symbols, etc. The Wikipedia article has a diagram showing the layout of a PE. See also this diagram
It ...
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6
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4
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What is the best way to parse differential equations and boundary conditions to a custom function?
I have written a method to turn systems of linear differential equations into matrix equations (discretisation). This handles boundary conditions using the row replacement method.
At the moment, I ...
- 453
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2
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314
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Removing banal words from a list
NB: I am aware of the DeleteStopwords symbol.
I want to remove from a list of words the ones that are likely to be more banal. So for instance if we have
...
- 1,558
13
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2
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190
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Repeated string pattern: difference between the FrontEnd and WolframScript?
This code works fine in a string based interface like WolframScript or Mathematica Kernel.
Run this through a string based interface
...
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4
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3
answers
100
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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:
...
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0
answers
125
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Slight loss of precision when parsing JSON
Exporting to JSON is working well for me under 11.3. The issue present in previous versions seem to be solved:
...
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11
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1
answer
173
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Lexical scanning and parsing in a toy language
I'm trying to do lexical scanning and parsing in a toy language. One with just functions (of the form $f(a,\,b,\,c,\,...)$, ended with semicolons) and special tokens (such as ...
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60
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Confusing behavior for GrammarRules and GrammarApply
I have been experimenting with GrammarRules in an attempt to create a parser for text downloaded from the web. I have been using Interpreter to help understand the behavior of GrammarApply. Here is a ...
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1
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100
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Precedence of cell group tokens over package's expressions
Bug introduced in V10.4 or earlier and persisting through V11.3
[CASE:4072996]
...
Kuba♦
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4
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How to convert a string having nested parentheses into an expression?
I am a Wolfram Language/Mathematica beginner and trying to convert STEP ISO10303 commands into geometrical regions.
A simple command looks like
...
5
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1
answer
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How to determine if RHS of first order ODE is separable or linear or neither? Parsing problem
Introduction
This is really a parsing question. But the context is that
given the right side of first order ode, I want to automatically
determine the class of the RHS. It can be either separable, ...
- 113k
20
votes
1
answer
397
views
Is building an event-based parser possible/reasonable in Mathematica (WL)?
Too long? Go to Problems section
Background
I like to learn by doing small, sometimes artificial, projects. Among other things I had 'parsers', and 'stream methods / streams in MMA' on my to learn ...
Kuba♦
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2
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371
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Getting the front sign of an expression. Positive or negative for formatting only
This is for the purpose of generating a string (actually it will Latex string, but that is not important).
I need to generate string as
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1
answer
65
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Can we make preread replacements in an *.m* file before being run?
This the second question of (152743), the preamble of which is reproduced here:
Those who don't have/prefer the front end of Mathematica will either use a plain ASCII editor to write a script in an <...
- 19.1k
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1
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75
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Can we make new definitions for InputForm in packages?
Those who don't have/prefer the front end of Mathematica will either use a plain ASCII editor to write a script in an .m file or just use Mathematica directly from ...
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Scraping XML Paragraphs with URLs
I've been working on scraping an article from CNBC. The link is here
I want to scrape the main body, and the code I have so far is this:
...
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1
answer
187
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Ugly Gaussian symbolic integration, how to extract coefficients and exponent argument?
I have a very ugly function with 157 terms that I want to integrate over three variables. Each term is a Gaussian integral in those variables multiplied by a polynomial in the variables. However, in ...
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answer
482
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Pulling Out Values from JSON Association
Having a bit of trouble pulling a value out of a JSON Association here. I am scraping this website: http://www.msn.com/en-us/money/stockdetails/history/fi-126.1.BY.NYS
I want to scrape the closing ...
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412
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HTTP Status Code 403
I'm working with some scraping and have run into a bit of a problem. The website I am scraping is this: https://seekingalpha.com/symbol/CRM/stocktalks
I am essentially trying to scrape the "stock ...
- 647
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vote
1
answer
80
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Extracting Certain Areas of JSON
I've been working with some web scraping and have run into a wall. The website I'm working with is this: https://seekingalpha.com/symbol/TWLO/stocktalks
I am trying to scrape all of the "stock talks" ...
- 647
2
votes
1
answer
467
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Parsing and Extracting XML Content
I've run into a little question while trying to parse XML. This seems like a rather simple task, but for the life of me I cannot figure it out. I pull up the XML of the website using the following ...
- 647
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2
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509
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Parse command line arguments
I have been trying to parse command line arguments.
There are a couple of types of options.
1. Mandatory
2. Optional
3. Alternative
There are built-in/3rd ...
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91
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Infix non-ASCII operator needs a space to be parsed correctly in a script
Bug introduced in 9.0 or earlier and persisting through 11.1
First off:
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2k
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3
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0
answers
37
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Unexpected behaviour with WordSeparators and Read [duplicate]
I am confused about how Read separates elements.
The following all work fine:
...
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5
votes
1
answer
198
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Context inside Do[...]-loop
Consider the following code:
Begin["mycontext`"];
myvar = 7;
Print[Context[]];
Print[Context[myvar]];
End[];
with the output
mycontext`
mycontext`
Now ...
- 517
3
votes
2
answers
889
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Reading a text file and parsing only the text between two delimiters
How are you?
I'm a chemist with almost no experience with Mathematica, but I'm thinking of using it as a tool for my Ph.D in Computational Chemistry. My Quantum Chemistry software (ORCA) generates a ...
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199
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How is a single tilde parsed?
How is a~b parsed and evaluated? I would expect an error, but it goes through without any complaints, yielding no apparent output. At first I thought it evaluated ...
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1
answer
73
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How do I import a Dataset that contains lists?
The very first example in the Dataset documentation is the following:
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1
answer
110
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How to use MakeExpression for single characters
Here is code that I thought would make the front end parse f as BigFunction:
...
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11
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4
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How to get the longest bracket pairs from a string
In C#, we can use regular expression to do some balancing groups, like we can get
{<aa <bbb> <bbb> aa>, <<dfa>a>}
from
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19
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4
answers
866
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Is it important that the front-end has a built-in parser?
The Notebook interface has a parser that seems aware of all operator-precedences, allowing us to step through the expressions (rather: Box-) hierarchy with Ctrl+.
This is extremely convenient, saving ...
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answer
74
views
Can Read[] apply a custom function automatically to the read values?
Read[stream, Number] will return a single read number. We can use a number of standard, documented types instead of Number, ...
- 227k
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0
answers
190
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SymbolicC/SymbolicCUDAFunction generating C/C++ parser?
I wish to do some program transformation and analysis.
Is there any package that generates SymbolicC expressions from C code?
In a sense I'm looking for the ...
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3
votes
1
answer
103
views
How to speed up accidental large output?
From time to time I accidentally let large expressions like RandomReal[1., {10^5, 10, 10}] reach the front end. The computation of the result is quite fast (...
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10
votes
1
answer
303
views
Why is this syntax for patterns with Optional values not supported?
I want to express Optional[PatternTest[Pattern[a,Blank[]],t],1] concisely.
a : _?t : 1 is not quite this but works: ...
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Weird bug with Esc, string, and underscore? [closed]
There seems to be a bug with esc key, strings, and underscores.
For instance, see the following code:
a = f["1_2"];
If an esc character is typed anywhere ...
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vote
2
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113
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Use cases to exclude data values over a certain threshold
I am trying to parse data output from a fluorometer. My output is basically signal intensity over time. So I have a list of 2 value lists with the first value time and the second signal e.g., ...
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291
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FullForm with context for each symbol?
FullForm strips the context for any symbol that can be found on the Append[$ContextPath, $Context]: ...
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1
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212
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How to read a part of huge matrix saved in a TXT file as single expression?
I saved a huge matrix of numbers with dimensions {400, 4001, 2} using Put and got a TXT file formatted in the following way:
<...
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314
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How to get "one Cell - one line" code format inside of NB files?
The PageWidth option controls the way the Cell's content is displayed, not the manner it's written in a ...
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