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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1
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1answer
137 views

Strange behavior: Cannot import data as MP3 format anymore

I am having the strangest problem since a day: Mathematica is no longer (after a reinstall) able to import MP3 files. I think these details should not be relevant, but they are all there are: It ...
1
vote
0answers
67 views

Why is BinaryReadList faster than BinaryRead? [closed]

I work on a package for Mathematica which reads some binary data from a file. I use BinaryRead to read data from the file, but it looks like ...
8
votes
1answer
178 views

Reading a HDF file im Mathematica

Bug introduced in 8.0 or earlier and persisting though 10.2 On OS X, the problem is present in 9.0 but not in 10.0, 10.1 or 10.2. I am trying to read a HDF file in Mathematica 9 on OS X and get ...
0
votes
0answers
63 views

Getting Boston Marathon Data [duplicate]

I am trying to use Mathematica to analyze the data given by the Boston Marathon concerning running time, etc. The website http://registration.baa.org/2015/cf/Public/iframe_ResultsSearch.cfm gives a ...
3
votes
0answers
119 views

Importing large number of frames form Video - improved method?

I am trying to work with large numbers of frames from a video (30000+). I see there are a number of answers out there, but I find none of them satisfying - see below for details. I understand from ...
1
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1answer
73 views

Performance of Extract-Transform operations

I'm doing simple data analysis, where I load some "date-time" data from a file. The data is a simple list, but there are 41,000 values in total. Here's a short sample: ...
3
votes
1answer
103 views

How to import several files at once?

I tried to import multiple files at once. Following this topic my code is ...
25
votes
3answers
2k views

Finding a function that fits the shape of an image

How can I find a function that fits the given shape of an image? Or instead extract a point set from the shape and then find an interpolating function fits the shape. An example image is attached.
1
vote
2answers
138 views

Doing same operation on multiple files

Is there a way in mathematica to do same operation on multiple files at once? And preferably have the output in a table or list form? I want to do the following operation preferably in few non-labor ...
2
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0answers
81 views

Is there a way to specify which kernel is used to import files (SOLVED)?

Following up on a previous question in which I encountered a memory leak in the JSON importer I have created a SandBox script that will run the Import and analysis on a separate kernel, which be ...
7
votes
2answers
114 views

Why doesn't Import work with XOWA offline Wikipedia database?

I'm having trouble with importing HTML from XOWA offline wikipedia database. I set up a local server for datamining, but I can't access it with Mathematica. I can request a HTML page with ...
13
votes
4answers
409 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 ...
2
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0answers
64 views

I can SystemOpen but I can't Import an online file (Internet and Intranet)

Thank you MarcoB and Pickett. I am currently using the Mathematica trial version on my laptop since my company's enterprise version will take 2 more weeks to setup because there are a lot of hoops to ...
1
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0answers
76 views

Importing SQL view vs table

I am trying to import a SQL view not a table in Mathematica. The command: SQLSelect[conn, "DataByYear"] This will correctly bring in the table. However using the ...
3
votes
1answer
99 views

Antialiased text in manipulate constantly re-evaluated, ignores TrackedSymbols

I am trying to display antialiased text (using the ImportString[ExportString[]] method shown here) but inside a manipulate so that the text can be changed interactively. I have found a way to do this, ...
9
votes
1answer
570 views

Mathematica 10 doesn't support path containing Chinese characters

Bug introduced in 10.0 and fixed in 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 into ...
3
votes
0answers
70 views

Importing sobj sage objects?

I am working with a sage-math object. With some older versions of Mathematica it was possible to send data directly but the function doesn't work with Mathematica 9. What are my options to import a ...
1
vote
1answer
59 views

Using Get function to return a specific expression

I am trying to use Getto import data saved as a .nb document. The problem is Getevaluates all expressions but only returns the ...
4
votes
2answers
136 views

Reading from a file: complex number with small imaginary part

I'm trying to read a matrix from the next file: 1+1e-18i 24 42 23.43e-23i using u=Import["file.dat","Table"]; and then find, ...
6
votes
2answers
140 views

Possible memory leak when importing JSON

Bug introduced in 10.0 and persisting though 10.2.0 This problem that I would like to resolve is how to free memory used Import a file when the file is no longer in use. I have a project in which ...
2
votes
2answers
229 views

Import a column of data, make a matrix from it and export it WITHOUT curly braces

I'm new here and with Mathematica, too. I want Mathematica to import data from a txt file (it has one column of data). These entries are z-values. From this I want to make a matrix - 508 entries make ...
10
votes
2answers
4k views

How to get Matlab data imported with the same dimensions?

I have some Matlab image data with the following dimensions (output is from Matlab): >> size(im) ans = 86 86 3 45 The data imports just fine ...
7
votes
1answer
411 views

ReadList can't read correctly

Bug introduced in 9.0 and fixed in 9.0.1 I'm trying to load some data into Mathematica from some files generated by fortran. But ReadList seems can't get the number correct. Here is a simplified ...
1
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0answers
40 views

How to avoid import evaluation until if wil return true

My goal is to import a data from url that depends of 1 parameter, this initialy value is null or undifined en yo have to selec some popup and then the variable has value, what is the method to do ...
28
votes
2answers
3k views

How to build a bvh (a motion capture file format) player in Mathematica?

How to build a bvh player that can be used to visualize human motions in Mathematica? Any idea or sample code would be appreciated. ...
1
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0answers
39 views

Imported variables (.mx) are emptied occassionally (Linux, v10.0.2)

I have a severe problem with variables being "emptied" occassionally. I am not able to reproduce the behavior but this is basically what happens: 1) store list ...
-3
votes
1answer
94 views

Loading CSV file is slow

I'm trying to import a CSV file that contains the latitude and longitude of some USA routes, but the import process is very slow and Mathematica spent about 10 min importing it. A link to the file ...
13
votes
3answers
2k views

How can I transfer mathematical expressions between Mathematica and Maple?

Is there a simple way to copy mathematical expressions between Mathematica and Maple (or at least in one direction)? I mean only expressions built from numbers and predefined mathematical functions, ...
0
votes
2answers
116 views

String quotes elimination

I'm trying to import a .csv file that contains some points which are geo-positions, but the import gives me the points wrapped in quotes. Is there any method to get them as pairs of real numbers? I'm ...
3
votes
1answer
175 views

How is Precision of Imported Data managed?

I am working on a financial/banking type application and part of the work is to import numeric data of 15 to 20 digits of precision. I am having trouble determining the best way this should be done. ...
6
votes
1answer
171 views

Is there a way to embed a data set in a notebook?

I have a data set (currently a table in a .csv file). I would like to share this notebook with colleagues either as a notebook, or (even better) as a CDF document. Is there a way to embed the data ...
26
votes
3answers
3k views

Extracting values from nested rules in JSON data

I have been using Mathematica to analyse some data from the StackExchange API. It is conveniently available in JSON form, which Mathematica interprets as replacement rules. However, some of the rules ...
2
votes
3answers
142 views

Import Data using selection criteria

I imported a file (text and numbers) and made constructed this. e[[1,All,{1,2,3,4,6}]] Column 1 is the name of the state. How can I get a subset of this where, say Column 1 is not equal to "New ...
2
votes
1answer
61 views

BinaryWrite negative numbers [closed]

testList = {1, 2, 3, 4}; file = "test1"; BinaryWrite[file, testList]; BinaryReadList[file] Close[file]; Gives {1, 2, 3, 4} ...
2
votes
3answers
72 views

An extra { when importing a file [closed]

I am trying to import data from a file. {k0,{a0,b0,c0},{e0,f0,g0}} {k1,{a1,b1,c1},{e1,f1,g1}} MyList = Import[file, "Data"]; But I get a list with an extra "{" ...
2
votes
0answers
251 views

Open LabView's TDMS file?

How to open the National Instruments LabView TDMS files? Has anyone developed a library or code for easily importing these? National Instruments provide a DLL and specification for the format. There ...
8
votes
0answers
107 views

How to connect to a video stream?

Is there a way to get a current frame from video streams (especially from RTSP streams)? I would like to connect to a camera in my local network and get a snapshot from it to do some further ...
3
votes
1answer
341 views

How to sample n frames from a movie file?

I'm looking to import 100 image frames from an mp4 video file at roughly evenly spaced intervals. As $ImportFormats shows, Mathematica can handle Movie files: .avi, .mov, .qt, .flv Multiframe ...
1
vote
2answers
184 views

How can I import a table from a Wikipedia page?

I'm trying to import this table from a wikipedia page containing the list of lunar missions into a Mathematica as an Association. Here, I'm trying to use the new ...
6
votes
2answers
287 views

Import data from excel and store it permanently in notebook

I am trying to write the code for doing the following: by clicking a button, import specific data from an Excel file which I select through a dialog window; input a name for the imported data set ...
8
votes
1answer
674 views

Importing Excel Spreadsheet containing Array Formulas

Has anyone had any success with importing an Excel Spreadsheet holding an array formula into Mathematica? The Syntax I'm using is ...
13
votes
3answers
428 views

ToExpression fails with long nested string expressions

Consider the following conversion from String to Mathematica Expression: ...
1
vote
1answer
133 views

Convert spreadsheet (Excel) to *.csv during import

I have long lists of data in spreadsheets and have the problem that Mathematica crashes regularly during import of the .xlsx files. Is it possible within Mathematica to take a certain tab of a .xlsx ...
1
vote
1answer
178 views

PDB Graphics Options: Opacity and Scale to superimpose on 3D point plot

I am trying to superimpose a pdb file into a 3D plot of points extracted from the pdb model, while making the pdb somewhat transparent for easy viewing of plotted points. My problems are as follows. ...
6
votes
1answer
92 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): ...
16
votes
2answers
223 views

HDF5 importing large arrays

I have some computations that output a 300,000,000 element array of long unsigned ints, so about 2.4GB, in an h5 file. Mathematica handles files south of 2GB fine, albeit taking very long to import ...
1
vote
1answer
107 views

Importing a spreadsheet with infinity values from Excel

I have imported a spreadsheet from Excel that I want to use as an adjacency matrix. I want to use this matrix as the argument in WeightedAdjacencyGraph, so I have ...
8
votes
2answers
322 views

How to copy and paste $n$ lines from a text editor to $n$ cells?

If I copy from an external editor to Mathematica notebook a block of lines (with a code) line 1 line 2 ... line n then whole text is copied to a single cell. I ...
13
votes
1answer
448 views

Any solution to transfer data between Python and Mathematica

I think Mathematica handles .mat file not very well, python is pretty good at this kind of jobs. In this site, there are plenty of question related to calling Mathematica from Python, or calling ...
1
vote
2answers
204 views

Plotting data from multiple text files

I'm new to mathematica and stack exchange, so any help would be appreciated. I want to plot a bunch of data from text files that contain a lot of extraneous data. I have a hundred files with different ...