Questions about getting data, files, images etc. from various formats into a form that can be read, tranformed and manipulated by Mathematica
7
votes
2answers
80 views
How to show wireframes on imported Object / Mesh (.obj file)
I've managed to import a Wavefront (.obj) file and store it in a variable like so:
...
7
votes
2answers
350 views
Import Fortran unformatted binary
I have an unformatted binary file generated using the Compaq Visual Fortran compiler (big endian).
Here's what the little bit of documentation states about it:
The binary file is written in a ...
7
votes
2answers
329 views
Import selected columns from a tab delimited text file
I have a very huge file (1GB) from which I desire to import only the 5th column. It is a tab delimited text file with a .txt extension. Can you please help me with ...
7
votes
1answer
112 views
Organizing similar datasets using Contexts or otherwise
I often import several long time series to analyze something about a city. When I have multiple cities, I use contexts. As a simple example,
...
7
votes
1answer
98 views
Get both output and return code of external program
Run["program"] will run an external program and return the return code.
Import["!program", "String"] will run the program and ...
7
votes
1answer
105 views
Using Differences on data: trouble with floats and doubles
Consider the following data set (after I have run FullForm), which is imported from a file (stored typically as 10.040):
...
7
votes
1answer
99 views
Exporting German Umlauts to PDF and importing them doesn't work - character encoding problem
I am using Mathematica 9.0.0.0 under German Windows 32bit. I am on trying to export and import German text to PDF and re-import it. It seems that there is a confusion about the character encoding. It ...
7
votes
1answer
389 views
Import file from FTP site
I would like to Import files from an FTP site. The code below works on a test site:
file = Import["ftp://test:test@ftp.secureftp-test.com/pigs.xml"];
But when I ...
7
votes
1answer
647 views
Import DCD (CHARMM/NAMD binary trajectory) file
How can one import the coordinates stored in a binary CHARMM/NAMD DCD file?
This is the structure of the file:
...
7
votes
0answers
148 views
Is there an efficient and elegant way to import huge datasets from a mysql database?
I'm struggling to import huge datasets (up to a couple million rows) from a MYSQL database into Mathematica. I already tried http requests, direct sql calls, as well as implementing a web service, ...
7
votes
0answers
132 views
Is there a Palette for processing experimental data?
I find that Mathematica has excellent tools for processing experimental data: importing complex data, manipulating it, fitting curve to the data and plotting with error bars. But the problem for me is ...
6
votes
3answers
320 views
Efficient image Import
I have several sets of 20 images I need to import.
Each time they have different categories.
"Name"<>"Cat"<>"No"
Electric B 1 for example.
I need to create lists that contain the images ...
6
votes
2answers
278 views
How do I display imported images at actual size?
I know that this is an extremely basic question, but I am having a lot of trouble finding the answer in the documentation.
When I import an image (for example, ...
6
votes
3answers
183 views
How can I read in specific information from a TeX-file?
I have several TeX-files and they contain information of the form
...
6
votes
2answers
200 views
How to process binary-encoded data without writing to file and importing?
I am consuming a webservice through NETLink that returns data directly in the response as a gzipped csv file.
I can successfully process the data like this:
...
6
votes
1answer
1k views
How to extract sample values from an imported WAV file?
Suppose I read a file with
B = Import["something.wav"]
Now how can I obtain a list of sample values?
6
votes
2answers
325 views
How can I open an Excel file and modify it in Mathematica?
I wanted to ask how can I view an Excel file from a Mathematica notebook and modify it.
I have seen a similar question, Open Excel file with Mathematica, but the answer involves .NET. Is there any ...
6
votes
3answers
172 views
Organizing similar datasets using DownValues instead of Contexts
In his answer to this question, Leonid helped me find a way to programmatically generate contexts for holding sets of symbols with the same names. Perhaps a simpler way is to use ...
6
votes
1answer
213 views
Operations on online files via public URL access
I need M. to access an online public directory via some URL (fake in this case)
http://example.com/images
and perform operations similar to those M. can do on OS directories and files. Examples:
...
6
votes
1answer
205 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
172 views
Converting XMLElement objects to plain text
Short version: How can I convert an XMLElement that represents part of a HTML document to plain text?
Long version: The more general problem is extracting ...
6
votes
1answer
171 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
0answers
103 views
What are the known differences between Save and DumpSave, and how to account for them?
Edit: I changed the title and (slightly) the wording of this question in order to make it more easily answerable.
If I evaluate this in Mathematica 9:
...
5
votes
2answers
247 views
5
votes
3answers
111 views
Unencoding encoded URLs in a function
Is there a built-in function for decoding encoded URLs in Mathematica?
I would like to convert an encoded URL, for example
...
5
votes
2answers
672 views
How to process .vtk file
I want to extract the cluster of points inside 3D box, is there any way one can do this in Mathematica?
5
votes
1answer
335 views
Exporting data from Excel into Mathematica using clipboard
I know that it's possible to import Excel data into Mathematica using the Import command, as we can see in this post. But some times, I need just to do some fast ...
5
votes
1answer
60 views
Importing images from the web using ImportString & URLFetch
I can bring images from the web using the Import command like this:
Import["http://blog.wolfram.com/wp-content/uploads/2008/06/se-30.jpg"]
Sometimes the web ...
5
votes
1answer
436 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
119 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 ...
5
votes
2answers
222 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
132 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
67 views
Why doesn't DumpSave work for elements created within a local notebook context?
I recently noticed that when dealing with notebooks with local context, I cannot successfully DumpSave variables, or, rather, when I call ...
4
votes
3answers
244 views
Plotting data with exponentials
I have some data with 19000 sublists such as :
{" 7.9080000e+01 1.9283193e+04"}
Where the first number is the value for variable ...
4
votes
4answers
701 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 ...
4
votes
2answers
310 views
Why does importing a URL fail the second time and produce a FetchURL::conopen error?
I have Mathematica code that uses Import[] to download URLs. I noticed that first time I use the Import[] command it works. ...
4
votes
2answers
104 views
Image Rotation, Line Symmetry
I'd like to import an image, superimpose it, reduce the opacity of the overlaid image, and then use a manipulate to rotate the top image to illustrate rotational symmetry.
The image below is using ...
4
votes
2answers
165 views
Importing array with complex numbers
This is probably an easy question: I am exporting the results from a longer calculation into a dat-File, then I set the cell to non-evaluatable and put an Import in front, so I can later work with the ...
4
votes
1answer
106 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 ...
4
votes
1answer
167 views
Attaching WolframAlpha data
I have used WolframAlpha since it was launched (now a pro member) but am new to Mathematica 8. Is there a way to automatically add data from WA to a Mathematica dataset? For example, what if I ...
4
votes
1answer
223 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 ...
4
votes
1answer
155 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 ...
4
votes
1answer
731 views
Importing CSV financial data in Mathematica
I am trying to import a CSV file in Mathematica 8 with the aim of charting it with the TradingChart command. This is what I have done :
...
4
votes
1answer
531 views
Difficulties with Importing PDFs in Mathematica
I am trying to import a group of PDFs that I have downloaded (it is in the realm of 1,000+). They are a group of doctoral dissertations that I'm trying to automatically extract bibliographic ...
4
votes
2answers
313 views
Trying to extract information from an MDB file. Import is too slow
I am running a Linux box and as usual the documentation for this type of box is not great.
I am trying to open up and extract and possibly include later on information from a "mdb" file. The file ...
4
votes
1answer
333 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 ...
4
votes
1answer
64 views
How to prevent output truncation when importing large Graphics?
The Evaluation Preferences in Mathematica specify a maximum output size of 1048576 Bytes before truncation occurs. That makes a ...
4
votes
2answers
382 views
Reading in scientific notation from C++ to Mathematica
With a text file with entries formatted as (output from C++):
f[38.67] = -2.5387862698183892298317350539374412777263289550697e-05;
⋮
Is there a way to read this ...
4
votes
1answer
513 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 ...
4
votes
1answer
153 views
How can I colorize an imported model?
How can I colorize an imported model from for example 3ds max?
I'm trying to find the way to colorize a 3D plot from an imported model with something like this:
...
