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
2answers
133 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 ...
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
2answers
558 views

How to test if file exists and stop

At the moment I'm using > ...
4
votes
3answers
327 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 ...
3
votes
1answer
132 views

RawJSON vs JSON format

It has been very recently, since the release of version 10.3.0 I think, that Import/Export and ImportString/ExportString functions accept a format parameter with the value of "RawJSON". The ...
3
votes
1answer
328 views

Efficiently reading CSV with ReadList

I have a large CSV file (~1gb) with mixed data. Basically with strings and integers. It takes very long to import this whole dataset with Import[] so I would like ...
3
votes
1answer
92 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, ...
3
votes
1answer
638 views

Exporting/Importing a Table of complex numbers

I'm generating a long table of list of the form: PN={{1,2,1+i},{3.5,2.6,2}...},{...},... Using: Export["PN.dat", PN, "Table"] ...
3
votes
1answer
693 views

Mathematica PDF import and fonts

I am trying to put nice LaTeX labels on my Mathematica plots. I can do this manually, or by introducing an extra GNUPlot step into my workflow, but it would streamline the process considerably if ...
3
votes
3answers
672 views

How can I change the CDF which imports the data and uses it, without execution of code

I am making an application which first imports the data from the Excel file and then uses it in the deployment of a CDF. But is it possible to change the data of the Excel file and see its ...
3
votes
3answers
441 views

Support for Compressed Sparse Column sparse matrix representation

Is there native support for Compressed Sparse Column (CSC) format for sparse matrices, like importing and manipulating them?
2
votes
0answers
76 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 ...
2
votes
2answers
890 views

How can I remove text headers when importing a numeric table

I have a file let's say 1.txt having numbers like: fgdgfdg fhdfdh 0.000105533 1.00E-04 0.222281 1.00E-04 0.444456 1.00E-04 0.666631 1.00E-04 asdas ddfdsfsd 0.111193 0.166733 ...
2
votes
1answer
2k views

Having Problem with Importing Excel file to Mathematica Notebook?

I have solved some equations and exported the final results, which they are several Matrices, as a EXCEL file ( .Xls ). Now, I want to use these EXCEL files as my inputs to solve some other equations. ...
2
votes
1answer
1k views

How to import a Microsoft Word document into Mathematica?

I have a Microsoft Word document in DOCX format. I need to import it into Mathematica as a String preserving all formatting (font, size, bold/italic style, colors, ...
2
votes
2answers
381 views

Importing LTSpice data into mathematica

I am working with LTSpice (Discret electrical circuit ( Spice) simulator). I would like to import LTSpice ouput data into mathematica for processing and plots. An example of a file can be found here ...
2
votes
0answers
120 views

Significant platform-dependent efficiency when importing data?

I'm curious, as I understand that answer this way: If you are using a Linux derivative or something like cygwin on Windows, then this is an efficient solution for reading only the third field ...
2
votes
1answer
691 views

Importing data sets from plain-text files and performing operations on them

I am working with a lot of daily weather files in the txt format. I need to calculate a daily quantity from each of them, e.g., daily light intensity, which ...
1
vote
1answer
110 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
2answers
120 views

Why can't I import a file in the init.m file?

I would like to have some data read in every time the kernel starts, but it doesn't seem to work. Say I have a CSV file I want to have read in, for example I use: ...
1
vote
1answer
120 views

Extracting Imported Information

What I want to do is to compare the relationship between the consumption of say beer and wine using scatter plots where each point designates the particular country (preferably named). I have tried to ...
1
vote
0answers
70 views

Getting InputStream errors when including a call to ElementData within an Import definition

So I am writing an ImportExport converter for a common chemistry file format, and I've run up against a problem that seems to be about shared streams and whatnot. ...
1
vote
1answer
282 views

Automating sequential import of data from web

I am trying to import data from multiple web pages hosted by a single online source. The data is posted by the source as one data set per web page for each week of the year. I would like to import the ...
1
vote
1answer
2k views

Importing a matrix from a text file

I have a $4 \times N$ matrix in a .txt file of the form: -17.071 137.567 16.554 0.65 -16.873 136.138 16.934 0.7 -15.397 135.738 16.894 0.7 -14.7 135.982 15.9 0.6 ...
0
votes
3answers
63 views

Importing Text file with Null Character column separation

I have a text file (ANSI econding) with two columns of real numbers separated, unfortunately, by a "Null Character" ("\.00"). How can I import this data easily? ...
0
votes
1answer
63 views

SocialMediaData[“Twitter”] - strange output

I am getting error messages when I use SocialMediaData["Twitter"]: ...
0
votes
0answers
52 views

Automatic import of Maple expressions into Mathematica using MathML

I'm would like to automate a process so as to convert Maple expression into Mathematica expression. For the moment, thanks to the function ...
0
votes
2answers
106 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 ...
0
votes
2answers
86 views

how to read a list from a file which has mixed types of data?

I need to read in a file with the first several lines reading as ...
0
votes
1answer
79 views

Cannot import data into a notebook as a list of numbers

I have text file with a list of numbers separated by commas, which I would like import into a notebook to be called when the name ratevector is used. If I cut and ...
0
votes
1answer
62 views

How to get an elements of given class that generated by javascripts

I want to get the number of total pages of a given search resluts of this site: http://srh.bankofchina.com/search/whpj/searchen.jsp, e.g., from 2015-1-12 to 2015-1-13 the currency of USD by the ...
0
votes
2answers
132 views

How can I troubleshoot a PDF that fails to import?

I'm trying to import a PDF file whose text I'd like to parse, but I'm getting an error with no explanation: ...
-1
votes
4answers
133 views

Import vs ReadList CSV file with Currency Values

A testing file with the specified format can be downloaded from here Let's read a few lines from this file ...