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31
votes
1answer
891 views

Local variables in Module leak into the Global context

From the Mathematica documentation on Module: Module allows you to set up local variables with names that are local to the module. But after using ...
14
votes
2answers
302 views

Why doesn't Mathematica use uniform criteria for validating Options?

Plot[Sin[x], {x, 0, 1}, pp -> 0] Gives as expected: Plot::optx: Unknown option pp in Plot[Sin[x],{x,0,1},pp->0]. >> However: ...
12
votes
2answers
492 views

Parsing a CSV file using Interpreter

The new Interpreter functionality in version 10 looks like it has the potential to make parsing custom data formats very easy. I'm trying to create a CSV parser. ...
11
votes
2answers
349 views

Tokenize Mathematica input in a simple way

Background Usually, I give detailed descriptions when I have a question which sometimes lead to that users don't write their answers because they maybe think their answer is too simple. Therefore, I ...
10
votes
4answers
357 views

What is the correct way to use specific rule for specific pattern match when parsing an expression?

update: Thanks for the answers below. But I noticed they do not handle the following special cases: lis=1 and lis=z , ...
9
votes
3answers
239 views

balanced Shortest[] and string-patterns

The pattern Shortest["A"~~__~~"B"] is oriented : It assumes the text is read from left to right and it takes the text between the first "A" and the next "B". Any ...
9
votes
2answers
825 views

Light syntax parser for Mathematica?

My netbook is too slow to install Mathematica. I'm not set against working in a text editor, but I like having an automated highlighting/formatting environment; can anyone recommend a good gedit ...
8
votes
3answers
317 views

How to parse information contained in a file name

I have a set of files containing my data, and the file-names contain relevant information that I would like to extract. What I have is: ...
7
votes
2answers
218 views

Using MatchQ (or other means) to parse an expression using sums of COS or SIN correctly

I am writing a function that will take an expression as input. I want to make sure the expression is valid first before processing it. Looking for a correct to use ...
7
votes
1answer
210 views

How to programmatically replace an expression in a .m file

I'm trying to write some code to programmatically replace a particular expression in my init.m file with a different expression. (It'll probably be some multi-line ...
6
votes
1answer
194 views

On Reverting Code that Mma Switches to Raw Input Form Back to Standard Form

I experienced a similar issue to what is described in this post while editing formatted usage messages (that contained italics) in the declaration section of a package that I'm developing in the ...
6
votes
1answer
310 views

Efficient JSON parser for Mathematica

Im looking for a efficient way of parsing JSON data in Mathematica. I am having a lot of problems with ImportString because it uses Java, is too slow, and uses too ...
5
votes
5answers
329 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 + ...
5
votes
2answers
322 views

How to import a “.numbers” spreadsheet?

Does Mathematica support importing a ".numbers" spreadsheet file (from the "Numbers" '09 (ver. 2.3 554) spreadsheet program in Apple's OS X iWork office suite)? A ".numbers" file is actually a zip ...
5
votes
1answer
182 views

View the FullForm of ^^

Why am I unable to see the FullForm of ^^ (the shorthand notation for BaseForm)? ...
5
votes
1answer
101 views

Bug in grouping after editing code?

While looking at A question about conditional replacement I think I discovered a bug in the Front End that affects both 7.0.1 and 10.0.1 under Windows. If I copy and paste this line into a new Cell ...
4
votes
1answer
361 views

Extracting text from nested HTML lists <ul> <li>

We wish to analyze the tree structure of HTML documents that consist of nested lists, ie, using the HTML tags <ul> and ...
3
votes
1answer
118 views

Easiest way to parse semi-structured text file

I have a plain text file with some data. I need two things: Be able to extract certain values for the various field, e.g. to extract the 'Mean Dose [%]', that is to extract number ...
3
votes
1answer
101 views

Why is ^^ff not the same as ^^ToExpression[“ff”]?

I want to convert a hexadecimal string to a decimal (base 10) number: 16^^ff 16^^ToExpression["ff"] The 1st line returns the correct answer of 255, while the 2nd ...
2
votes
1answer
86 views

Make MyLogicalExpand

The function by Mathematica to expand a formulation with ANDS, ORS, NOT, XOR, and others, is LogicalExpand, let see an example: ...
1
vote
1answer
121 views

how to make a recursive function to analyse this file

I am stuck at this problem beginning We assume we have keyword k, and the structure in the file: file.txt ...
1
vote
1answer
275 views

How to import a CSV file into column vectors [closed]

I just got a trial version of Mathematica. I want to experiment with using it for data analysis. I have a CSV file here that I would like to import into Mathematica so that the data is represented as ...
0
votes
0answers
31 views

parsed matrix not deleting elements in adjusted matrix

I have a matrix that has been parsed to delete certain rows and columns, as well as delete certain elements on the diagonal on the matrix. The problem is that it does this in theory when i take the ...