Questions about getting data, files, images etc. from various formats into a form that can be read, tranformed and manipulated by Mathematica

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6
votes
1answer
542 views

How can I recover the source code from cdf file?

by a mistake I have deleted the nb file by which the CDF was generated. All required definitions were in one cell. If I remember the code looked like this: ...
6
votes
1answer
559 views

Accessing data on local machine from remote kernel

I have a remote kernel on a server that I would like to use to process some data. The connection works, i.e, I'm able to use the local front end and the remote kernel. However, I cannot figure out how ...
6
votes
1answer
771 views

Import numeric values from XML

I am trying to import data from an XML file and then perform calculations on those numeric values. When I import the data the values seem to be stored as strings. I tried using a ToExpression ...
6
votes
1answer
1k views

When do I use Mathematica, when do I use Gephi, and how do I use them together?

Mathematica has great operations for analyzing graphs but when the graphs are a bit bigger, Gephi seems to be more efficient (at least on my computer) at drawing and analyzing, i.e. visualizing the ...
6
votes
1answer
111 views

Extracting PNG images from AVI movie

I have written the following code to extract all images from an uncompressed AVI movie and to save them as sequential PNGs. ...
6
votes
1answer
344 views

Reading specific entries from a CSV file

This question is related to the following: Speeding up Import and Export in CSV format Stream CSV files Reading periodic elements from a large file I have a set of very large CSV files (a few ...
6
votes
1answer
51 views

Reading data from Google Docs

I am working on a personal project involving a CloudDeploy[ ] that reads data off a Google Doc and then works with it. Ideally, the Google Doc is either a text document or a spreadsheet which contains ...
6
votes
1answer
95 views

Import of data from ODS

With SetDirectory["~/Downloads"]; ifile = "test.xls"; TimeConstrained[idata = Import[ifile, {"Data", 1}], 5]; I can achieve the desired result of importing the ...
6
votes
1answer
376 views

ESRI shape files

ESRI shape files (shp): importing the polygon data can yield a very large list. It is computationally intensive rendering the polygon. I have been trying to convert to ...
6
votes
1answer
88 views

Importing hex values from a text file

This question appeared maybe an hour ago, but was removed by OP. I'm still interested in a solution. Suppose we have a text file with hex numbers separated by tabs (or spaces): ...
6
votes
0answers
66 views

Can't get Mathematica to Import PDF files with diacritics on the file name

Tested with versions 9.0.0, 10.0.2 and 10.3.0, all under OS X 10.10.5. and Linux The ...
5
votes
4answers
2k views

Numerical Differentiation using 1500 data points

I have a set of 1500 data points (which are some energy eigenvalues) corresponding to a parameter H0 (which represents magnetic field. H0 values are equispaced going from $-3.0$ to $3.0$ in steps of ...
5
votes
2answers
593 views

How to test if file exists and stop

At the moment I'm using > ...
5
votes
3answers
286 views

Histogram of a very large dataset?

I have a very large dataset stored in a file (over 2GB). The file contains a tab-separated table of floating-point numbers. I want to do an Histogram of all the numbers in the table. But if I try to ...
5
votes
2answers
258 views

Max of imported numerical data will not work

I loaded a list with 400,000 values from a file. The list was loaded correctly as I can get it's length (by Length[]) and I can also plot it. Why can't I get the Max or Min of this list though? When ...
5
votes
4answers
254 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
1answer
708 views

Failing to import an .eps file

I have an .eps file which was created using GLE. There is nothing wrong with the file, GS View can read it correctly. However, when I use Mathematica to read it using ...
5
votes
2answers
2k views

Converting numbers to integers

I've read the available documentation but I still haven't found an NumberForm -> Integer function yet. No result in this site's search, either. Does it exist? ...
5
votes
1answer
192 views

Tools for Importing/working with SEED seismographic data in Mathematica?

Do you know if exist a library or a package in order to import and work with SEED Seismographic data in Mathematica?
5
votes
2answers
376 views

Sorting a large file

I have some huge logs, which are text files, containing up to a million rows each, and I need them sorted. Because trying to import one obviously makes Mathematica run out of memory, we must rule out ...
5
votes
1answer
430 views

windrose with data from Excel

How to Import data from excel and use them to Plot windrose instead? Example, {{Strength, Angle(degrees)}..} ...
5
votes
1answer
506 views

How can I log in to my Wikipedia account and access my watch list?

Wikipedia's "Edit Watchlist" page (for logged in users) has a list of hyperlinks to the user's watchlist (here is an example from my account). I've tried to use ...
5
votes
1answer
1k views

Importing specific elements from JSON

I'm having trouble importing JSON in the way I expect, based on my reading of the documentation. The particular issue I'm having is with importing a specific element, or list of elements. From the ...
5
votes
2answers
423 views

How to save a web page in mathematica?

For a given web page http://www.nytimes.com/, is it possible to save it as : first: only HTML(within css) second: more elements(include pictures and so on) just like what a browser can do. ...
5
votes
1answer
403 views

Importing tabular data that has been exported from Evernote

In Evernote you can embed HTML tables in the note. You can then export them to an xml format with the extension enex. I am trying to get the data from the table imported into Mathematica. Here is the ...
5
votes
1answer
666 views

Open data file from CDFPlayer?

Using a CDF program running in CDF Player, is it possible to use a system dialog box, or even just an Import statement such as Import["*.CSV"], to import data from a text or comma separated file on a ...
5
votes
1answer
145 views

Efficiently importing data into Mathematica

I have a graph data file infile.txt. 3 2 0 1 1 2 3 2 0 1 2 1 3 2 1 0 1 2 3 3 0 1 1 0 1 2 3 3 0 1 1 0 2 1 3 4 0 1 1 0 1 2 2 1 ...
5
votes
1answer
221 views

HDF5 and complex numbers

I "Export" an array with complex numbers with HDF5 format. When I "Import" it, I only get the real part. Simple example: ...
5
votes
2answers
303 views

Lookup in Inverse Symbolic Calculator+ from Mathematica

There is a useful feature in WolframAlpha that allows to find a possible closed form for approximate numeric values. It can be used, for example, to guess the value of an integral that Mathematica ...
5
votes
1answer
123 views

Why can't an `Import[]` change $Path?

Does anyone know why Import["http://**server**/file.m"] can't make a change to $Path? It seems like ...
5
votes
1answer
2k views

Combine multiple PDF files into one document

I have multiple single page PDFs I'd like to join together into a single file. (Obviously I mean the file format and not the probability distributions here!) I'm aware of free online services such as ...
5
votes
1answer
145 views

Import another Notebook as if it were a Package

Is it possible to import the contents of another (existing) notebook into the current namespace in the same way that I can with a package? I know that it would be best to use a ...
5
votes
1answer
736 views

ReadList can't read from file containing high-precision Reals

I want to read a file which contains seven columns of real numbers. Mathematica seems to have a problem with the high precision I need. My code: ...
5
votes
1answer
957 views

Efficiently exporting many images as a video

I have many .gif images and I would like to export them as a single video file (I prefer .mov, but any video format is fine). But what if I have several tens of megabytes of .gif images? Is it ...
5
votes
1answer
94 views

ReadList ignore comment lines?

Is there a way to make ReadList ignore certain "comment lines" (say, all lines that start with #, or in general all lines that ...
5
votes
2answers
285 views

How to remove an expression from a file?

To read in expressions from a file, one can do ReadList[file, Expression, 3]. How to do the opposite, i.e. remove a number of expressions from a file, modifying ...
5
votes
1answer
125 views

How to analyze all the data in a directory

I am trying to import, analyze, and save all the .txt files in a specific directory. I can do this with a single .txt file using the following code: ...
5
votes
1answer
337 views

How to import non-text data from std input in a Mathematica script?

Or maybe a better question is - how can I get a stdin stream? I need to run on Linux. I did look at Reading from STDIN, or: how to pipe data into Mathematica, but ...
5
votes
1answer
188 views

Importing Data with Line feeds

I am trying to import data from a CSV file into Mathematica that contains line feeds in certain elements that I wish to be properly rendered in Mathematica. I suppose this has something to do with the ...
5
votes
1answer
596 views

Reading in Huge Text Files

I would like to read in really large text files (about 2GB) into Mathematica. The structure of the file is such that the first row and the first column are text i.e strings. Rest is all numbers. Is it ...
5
votes
1answer
235 views

How to import numbers or protected signs from .txt?

I'm new here, so please apologize any formal errors. I stumbled upon a somewhat simple problem. I want to import plain numbers or protected signs like Pi, ...
5
votes
1answer
226 views

Import YAML file into Mathematica

Has anyone implemented the import of YAML data files into Mathematica? I suppose some sort of transformation into a nested list of rules would be the way to do it. Thanks
5
votes
1answer
279 views

How to transform a DumpSaved .mx file to .m file conveniently?

I have many DumpSave-d .mx files under a directory. They are generated under Linux. The .mx ...
5
votes
0answers
67 views

why does ReadString[“fname”,term] open a persistent stream, and how to close it?

Bug introduced in 10.0 and fixed in 10.3.0 Create a file temp.txt with the following content: test1 ;;; test2 ;;; test3 ;;; ...
5
votes
0answers
130 views

Call Magma in Mathematica

I've written some code in Mathematica, related to some group theory questions I have. Subsequently, I found that part of the code could be significantly sped up if I could just call a routine in ...
5
votes
0answers
253 views

ImportString JSON possible bug

My problem is when I catch up some json output of whatever method and process it with ImportString[%, "JSON"], The first time ...
5
votes
0answers
1k views

Import Large Excel File

Currently, I am working on a large time series dataset, which contains 928,586 rows and 35 time intervals in columns, in excel format (.xlsx) and using Import to ...
5
votes
0answers
63 views

Importing .zip file [duplicate]

Possible Duplicate: Importing Zip files I have a piece of code which imports a txt file and turns it automatically into a table form. I use the following: ...
5
votes
0answers
139 views

What is the best way (lossless) to import .skp files into Mathematica?

I am using the free version of Google Sketchup and I've got a few designs in hand, which I need to be able to import into Mathematica. I saw the similar question asked by @Sjoerd C. de Vries in Stack ...