Tagged Questions

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
votes
2answers
44 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
67 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
24 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
33 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
61 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
32 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 ...
0
votes
1answer
40 views

Copy files existing in different directories under the same directory

I have many files existing in different directories, I need to copy it under the same directory. Any suggestions?
3
votes
1answer
99 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
82 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 !
9
votes
0answers
65 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
89 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
24 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
53 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
36 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 ...
5
votes
2answers
63 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
41 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
83 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
106 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
41 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
47 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
46 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 ...
12
votes
0answers
115 views

A documented syntax of FileNames doesn't work?

According to the documentation for FileNames: However when I attempt to use this syntax I get an error: ...
0
votes
1answer
47 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
54 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
85 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
129 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
166 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
87 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
85 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
63 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 ...
2
votes
1answer
112 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 ...
5
votes
1answer
271 views

Mathematica 10 doesn't support path containing Chinese characters

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 into front end. I got path like ...
0
votes
1answer
49 views
-1
votes
3answers
87 views

How do i import a list of files, choosing the name

I have this list of files, i'm using FileNames[{"*.txt"}, NotebookDirectory[]] to import it, but i just want the ones without inelastic on the name. How can i select just by the name? Thanks ...
2
votes
2answers
94 views

How to set an absolute path name using SetDirectory?

I tried the following: Directory[] /Users/John SetDirectory["Library/Mathematica"] ...
0
votes
1answer
90 views

Loading and processing five files at a time from a directory containing many, many files

I have 3000 files (for example: aa101.csv, aa108.csv, aa120.csv, ...) and I need to process them. I need to load five files from a folder, process them, and export them to new list in Excel. Then I ...
2
votes
1answer
64 views

Get names of all folders in a directory [duplicate]

I simply want a list of the folder names (without subfolders) in a directory, but can't seem to find the right command for this. Can anyone help me out :)? Thanks in advance
2
votes
2answers
99 views

Specify column width while exporting

I am trying to export a set of data into a file but I can not force mathematica to keep a certain width for each column. For example, when I export a table: ...
0
votes
2answers
99 views

Creating directory structure through Mathematica

Is there mkdirs() (make directory structure) equivalent in Mathematica? I want to specify something like this : dir1/dir2/dirn ...
3
votes
1answer
63 views

Order imported files by their alteration date

Probably a very easy question, but I could not find the answer, so it would be very nice if you can help me: Let us say I have 10 files, all with the extension ...
0
votes
1answer
350 views

NotePad++ User defined language

I know there is a xml file with language for Mathematica notebook (nb or m files). The link is http://sourceforge.net/apps/mediawiki/notepad-plus/?title=User_Defined_Language_Files Now I want a xml ...
1
vote
1answer
82 views

Merge StyleSheet into a notebook

I have a custom style called style1.nb and I want to install it into a notebook Class01.nb so I can send only the notebook file to my students with the style of style1.nb. Is that possible?
1
vote
2answers
96 views

How to generate a unique file name similar as that created by CreateTemporary

CreateTemporary can generate a unique file name like ...
1
vote
3answers
390 views

How to export data to a plain text file?

I am preparing data used by a command line program. It requires data in a simpliest possible format: value_x1 value_y1 value_x2 value_y2 ... value_xN value_yN ...
0
votes
1answer
102 views

Create new file, based on 500 articles

I've got a folder with 500 newspaper articles. Each article is saved in a seperate file with a number in the title like "1.txt", "2.txt". Each article has a date but it is not clear in which line the ...
11
votes
3answers
144 views

What kind of check does DirectoryQ exactly perform?

I'm using Mathematica 9.0.1 on Windows XP and my drive letters are assigned as follows: C: and D: are hard local disks, while ...
2
votes
1answer
78 views

How to create .ico file in Mathematica?

How to create .ico file in Mathematica? I mean the favicon images used for web sites. Directly using Export["file.ico", <some graphical expression>] does ...
0
votes
0answers
140 views

Savitzky-golay filter

How to use Savitzky-golay filter on csv file? I have file.csv in this format: 0.1,1.6,2.8,0 0.2,1.2,2.3,1 0.7,1.5,2.4,2 0.6,1.2,2.7,3 0.4,1.4,2.9,4 0.3,1.3,2.5,5 ...
3
votes
1answer
190 views

Writing results directly to file

I am trying to find all simple paths in a large directed graph (542 vertex, density ~ 5%) between two nodes. For this purpose, I use the algorithm from this thread. Unfortunately, my computer is ...
5
votes
2answers
170 views

How does the speed of WriteString compare to other languages?

I'm doing something where the most sensible approach seems to be to open a file and write to it as I process data from some large tables. Old school. While testing the program, I remembered the low ...