Questions on obtaining files and directory structure/information and manipulating the said structure/information, searching/renaming particular files in a directory, etc., in an OS independent manner.

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0
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1answer
29 views

Is there the possibility to write many times a value in definite list of file1.nb?

The commands testData = RandomReal[{0, 1}, {1, 1}]; Export["C:\\Users\\Alex\\Desktop\\1\\file1.nb", testData]; write the “testData” (value generated by ...
11
votes
1answer
143 views

How to get the directory of a package?

I have a package that I have placed in the $BaseDirectory\Applications directory so that Needs can find it. I have a logo in ...
0
votes
2answers
49 views

What does CreateDirectory[] return?

Based on: CreateDirectory returns the full name of the directory it creates, and $Failed if it cannot create the directory ...
4
votes
2answers
221 views

Why does the hash of a file differ from the hash of its content?

FileHash doesn't allow arguments like FileHash[file,{"CRC32","MD5"}]; A solution could be: ...
0
votes
2answers
57 views

Get a filename used in an import and store it as a variable

Hopefully a simple one for you (or at least seemingly)! I import a .txt file, from which i make a ListLinePlot. I simply want to read in the name of the file, store it in a variable so I can use it ...
4
votes
0answers
47 views

How to force the writing of buffers onto disk?

Usually, buffering is good; except when you critically need to write data to disk. Is there a way to force the writing of buffers onto disk? (I'm using a binary file) I believe a ...
1
vote
1answer
87 views

Exporting File Outside Home Directory

When running Mathematica (v10) on my Raspberry Pi, I'd like to output an image file to a directory other than /home/pi. I understand that letting Mathematica write ...
3
votes
2answers
77 views

Most efficient way of splitting a file into length-prefixed blocks

Let's say I have a really big file (>100MB) that consists of length-prefixed blocks, i.e. the first byte of each byte block indicates the length of the rest of the block. This is a simplified example ...
0
votes
1answer
49 views

Export array data into a file

I tried to solve some equation for different values of parameter t and put results into array. Then I wanted to write this data into a txt-file. So i did it with ...
1
vote
1answer
44 views

Searching if a directory exists within a folder

I hope this question is not a duplicate, but I could not find any other question which answered my specific question, which is: I have the following folder structure (just an example): ...
0
votes
1answer
37 views

How to get only the directories (not the files) inside the current directory? [duplicate]

FileNames["*"] lists all the files and directories inside the current one. How can I list only the directories?
2
votes
1answer
66 views

Code reuse between files in the same directory

At the moment, I am producing various complicated interactive plots. They all share a common "code base", with modifications on top of it. I would like to refactor my code so that the various files ...
1
vote
1answer
41 views

Can i change the default search paths?

When i try to load packages on this computer, i get an error (i already know the packages work). I think the issue might be to do with the fact that mathematica can't process the network drives, some ...
0
votes
0answers
26 views

Can't Load .rst file

I've been working with the FeynRules 2.1 package in Mathematica 10. If I download the MC4BSM_2012 FeynRules files and run the Mathematica Notebook I've got no problem in Ubuntu (A lot of warnings ...
2
votes
2answers
131 views

Adding NotebookDirectory to $Path when notebook opens

I'm trying to get relative notebook paths work without evaluating $Path = Append[$Path, NotebookDirectory[]]; each time I open a notebook. A bonus would be to keep ...
1
vote
1answer
80 views

How to evaluate the same code in a whole bunch of existing notebooks

I have a large folder of existing notebooks, each currently containing a single cell of input. I would like --- in each of these notebooks --- to evaluate that cell, evaluate a new chunk of code I've ...
4
votes
1answer
52 views

how to make SaveAs saves to NotebookDirectory[] instead of NotebookBrowseDirectory[]?

I find Mathematica handling of directories utterly bizarre to say the least. I end up losing changes and seeing files saved in wrong folder due to this. Even in Version 10.01 which I am using, on ...
4
votes
2answers
199 views

How can I import and split lines with ASCII separator?

This is my data file, each line was separated by SOH, maybe hex \x001, I've tried some options of ...
0
votes
2answers
69 views

File Handling. How to save the progress in a file?

Assuming I already have the file created. I have a programme that,returns an output, in our case number. I want Mathematica to save this number in a file, together with results saved from previous ...
1
vote
1answer
105 views

ReadList can't read “.csv” data with correct line number?

Well, the problem was solved today. Since "testAll.csv" is generated by Java/Eclipse, and I noticed that the LineSeperator is ...
2
votes
1answer
35 views

Put/Get don't accept a string-valued expression as filename [duplicate]

I'm trying to do the following with an expression: filename=StringJoin[{"myfile", ToString[someNumber],".m"}]; expression >> filename; But mathematica ...
0
votes
0answers
82 views

How to automatically Import, Name and Export multiple images? [duplicate]

Sorry for the very basic question but I'm really new to Mathematica. I have a directory(myDataDir) full of images (myImage1.tif, myImage2.tif...) I have a piece of code (let's call it ...
1
vote
1answer
112 views

Copy/Pasting code that contains double quotation marks leads to broken code [duplicate]

Sometimes, when copy/pasting code that contains a string (double-quotes around it), the copy of the code fails to evaluate. For example, the original code ...
1
vote
0answers
52 views

SemanticImport::unexpinvaliderr error when using trial version

I am trying to use SemanticImport for a personal experiment. I can correctly import a tsv file from a path, but if I change ...
3
votes
1answer
129 views

How does Mathematica use system environment variables?

Is there a common way in which environment variables are accessed, stored, or used by the kernel? There are built-in functions for querying and setting vars in the system environment, but there are ...
1
vote
2answers
100 views

Change Temporary Directory

How to change the value of $TemporaryDirectory ? I need to change it because there is not enough space on the C drive and the calculation seems to stop after a while !
10
votes
0answers
74 views

Is there a way to stop Export if the file size is too big?

I've got code that's exporting a file, but the file might be so big that it will take up too much space on the cluster I'm using and crash other users' processes. Is there anything like ...
7
votes
1answer
127 views

why CopyFile cannot overwrite existing file?

CopyFile return $Failed when the file exists on destination. is there any way to force CopyFile to overwrite the existing one? the way I use now is DeleteFile and ...
0
votes
0answers
35 views

How to get the subdirectory of a ftp weblink?

For example, I can use FileNames["*",dir] to get all subdirectory under dir if dir is some directory of my local computer. Suppose that I want to get all ...
2
votes
1answer
56 views

What's the complete list of file name extensions used by Mathematica?

What's the complete list of file name extensions used by Mathematica? The ones I know are Before V8 .m .nb .mt After V9: ...
1
vote
0answers
39 views

Default starting location of “Save as…” dialog in OS X [duplicate]

In the answer to this previous question, user Szabolcs says On OS X (I'm using 10.9 and Mathematica 9) the file chooser dialogue will remember the last location you used. So if you Save/Open ...
6
votes
2answers
97 views

Error when implementing StartProcess[] in loops (Do, While, Table)

I'm using Mathematica to control another program (Surface Evolver) through the terminal (ie using StartProcess[]; and ...
1
vote
1answer
46 views

How to copy a uncertain name file with the command CopyFile in Mathematica

I have many files named like this "GSM697492_500_D1.CEL", and a another file which contain the first part of the file name like this"GSM697492". I want to copy the some of the CEL files from one ...
4
votes
2answers
87 views

Minimal label to distinguish among a list of directories

I have a list of long directory names. For each directory name, I need a label just long enough to distinguish itself from the rest. Each label should be a ...
4
votes
1answer
141 views

Watch File in Directory .NET

How might I watch for a specific file to change in a directory using Mathematica/.NET code? The following works in .NET but fires twice when you change the file. ...
3
votes
1answer
44 views

Where can I permanently modify Directory[]?

First I set SetDirectory["F:\\learning_mma"];Directory[](*ok,success*) and then I quite the kernel: Quit[] an then ...
2
votes
1answer
55 views

What's wrong with this RenameFile?

I want to rename a .txt file. For example create a file on your Desktop and name it use TEST.TXT, now I want to rename it to ...
0
votes
2answers
56 views

Use modified part of file path as new file name

i want to import an image, modify it and then export the modified image. Something like this: img = Import["C:\\Images\\e4271-5.jpg"] Some modifications ...
17
votes
0answers
197 views

A documented syntax of FileNames doesn't work?

bug present as of 10.0.2 According to the documentation for FileNames: However when I attempt to use this syntax I get an error: ...
0
votes
1answer
64 views

Rename a list of files [duplicate]

I need to rename a list of files .bmp having name like 1.bmp, 2.bmp,...,155.bmp. I want to get a list of files having the same number of digits in name like 001.bmp,002.bmp....,155.bmp. I am trying ...
3
votes
1answer
59 views

Windows Insert File Path

Suppose I want to Save["filename", foo] under Windows. Ordinarily, the way to deal with file names under windows is to open the Insert dialogue and find a file path, but in this use case, the file is ...
11
votes
1answer
136 views

$Path hijacked by PacletManager?

Summary: Since Mathematica version 6, the PacletManager seems to have engineered an escalating hijack of the $Path variable. Add-on packages need to have a ...
5
votes
2answers
189 views

Find file names in directory

I am trying to find the list of any file in any directory of a given name (by in the directory, I mean directly in the directory, so in a directory which is in the directory would not count). For the ...
15
votes
1answer
195 views

File-name completion for custom functions

Mathematica 10 has introduces file name completion. It works only with certain built-in functions such as Import, SetDirectory, ...
2
votes
2answers
174 views

Overwriting first line of large file

As mentioned, I wish to read the first line of a file, and if needed, overwrite it with a new string. The aim is to have a CSV with a list of possible elements. Example: ...
3
votes
1answer
126 views

how to write TableForm expression into file?

Now I have a list stored in data as follows data = {{"Ca", 1, 1, 1}, {"Ca", 2, 2, 2}, {"Ca", 3, 3, 3}} the ...
2
votes
1answer
72 views

How to read from /dev/random?

I am looking to read a few bytes from /dev/random on OS X and Linux. The simplest approach fails on both operating systems (see below). Why? What is a ...
4
votes
1answer
157 views

Get the last line from each of a large number of files, transform them, and write all results to a single new file

I have several hundreds of .csv files that are not logically named (contains numbers, characters, and special characters), all stored in a directory. Each file has large but unequal number of rows and ...
7
votes
1answer
375 views

Mathematica 10 doesn't support path containing Chinese characters

Note: This works correctly in version 10.0.2. I tried to import file in Mathematica 10 ( windows 7 system), the path contains some chinese characters. After holding ctrl+shift, and drag the file ...