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
0answers
134 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 ...
2
votes
1answer
81 views

how to import plain text file, with mixed formats with strings that contain commas [closed]

I have been struggling with this basic task, and I am surprised it is this hard to do in Mathematica. I get lost in the maze of Import and options and sub-options and after trying many things, still ...
3
votes
2answers
190 views

Importing CSV with multiline text fields

Here is a valid CSV: a1,b1,c1,d1,"e1 e1 e1" a2,b2,"c2 c2 c2",d2,e2 It has two rows and five columns, and contains two fields with embedded CRLF. (See the CSV ...
5
votes
3answers
377 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 ...
6
votes
1answer
139 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. ...
3
votes
1answer
158 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 ...
0
votes
3answers
84 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? ...
3
votes
1answer
117 views

Mathematica does not import .mat file correctly [closed]

I have .mat file that contains a binary (0,1) matrix with size 100*100*100. I have used this syntax to import it in mathematica ...
6
votes
2answers
153 views
0
votes
1answer
76 views

Why vertices number increased when importing .STL file

I import a .STL Import[*.st,"VertexData"] file on mathematica and I remark that the number of vertices is increased comparing to the number given by Blender. ...
0
votes
1answer
86 views

Package to read in data from excel files

I want make a package to add a function to Mathematica that reads all excel files is the working directory that is set after the package is loaded. ...
0
votes
1answer
43 views

Import a 3D CSV file results in the wrong dimensions

I exported a some of my data to a file, the data looks like this before the export ...
1
vote
2answers
164 views

Plot from data containing “e”

I have data as a "dat" file exported from matlab in this format: ...
1
vote
1answer
94 views

How to import an external pdf file leaving text as text?

When Importing in Mathematica (v10.3) a pdf file containing some text, the text is "vectorialized", meaning that it does not seem to be loaded as text, and re-...
4
votes
2answers
141 views

Extract part of a matrix

I have imported a matrix from a .txt file (it could be better from an Excel file): ...
4
votes
1answer
211 views

how can i associate the headings of columns/rows with content of itself and then recall what i want after i've imported the excel file in mathematica

Hello, i make another try... I have to import a file like this below (it is an excel file, i show you just the beginnig. it should have thousend of rows and columns). After i've imported the file i ...
3
votes
2answers
131 views

Take a specific part of a matrix imported from a .xls

i would like to know if there are any ways to link headings of a table i had imported with the data in the table itself. I imported a matrix from an excel file and i want to take a specific part of it....
0
votes
1answer
88 views

What´s wrong with my FindFit

I updated the data which is a table I deleted the first coordinate as it was the quote from the document. ...
3
votes
2answers
81 views

How to separate the double columns while reading file

I have a file which has contents of the form 10533 "MENDOZAT " 115.0000 : 1 1.00000 Now I want to separate the words and get it as a list. like ...
1
vote
1answer
113 views

Import graphml file in mathematica

I am trying import a graphml file I created with NodeXL in mathematica in order to create a network. However when i try to import it I get the error message: "Cannot import data as GraphML format". ...
1
vote
1answer
81 views

Edit header information of a DICOM file and export it again

I have some DICOM files and want to edit a part of the Header and export the DICOM files with this edited header. I know how to Import a DICOM files and extract the Header Information, but how to ...
6
votes
0answers
76 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 drag-...
1
vote
1answer
44 views

Medium-sized graph won't build

Why can't Mathematica import a 40-KB file (mediumEWD.txt) and build the underlying graph in some decent time? I waited a minute, nothing. ...
3
votes
1answer
108 views

Mathematica can't Import data of NetCDF file with Datasets name including “.”

I have downloaded NetCDF data file EVE_L3_merged_1nm_2015323_005.ncdf from http://lasp.colorado.edu/eve/data_access/evewebdata/products/merged/ and read it by Mathematica 10.0.2 on my windows 7. <...
1
vote
1answer
80 views

Downloading a number of images from a web site as a list

For a MachineLearning project I need to form a training set using images taken from the web page containing lots of them. Like, for example this one. It would be very convenient, if all the images ...
1
vote
1answer
108 views

HDF5 file managing for dummies

I am new to HDF5 format and I am also not hundred percent confident with Mathematica. I have googled to find out examples to deal with HDF5 files in Mathematica but couldn't find one that work out for ...
4
votes
0answers
78 views

File Formats for Scientific Data

I have a simulation written in another language which currently just dumps all its data (doubles, lists of doubles, lists of lists of doubles) in lines in ASCII, and then I read it into Mathematica by ...
0
votes
1answer
62 views

file import from website failed (Http status code 403 returned) [closed]

I failed import an xls file from website in Mathematica but got no problem to download it directly using chrome. Can anyone help me solve the problem? Thanks. The detailed situation is listed as the ...
4
votes
1answer
96 views

Importing large datasets using streams

I work with large data sets with 22 columns and up to a million rows. Each row contains one observation with several variables. All variables are numbers. Simplyfied example: 1, 1, 2, 3, 4, 5, 6,...
3
votes
1answer
185 views

Run Command Not Executing Node

How do I make the following command work in Mathematia? Import["!\"C:\\Program Files\\nodejs\\node.exe\" -p console.log('test')", "Text"] I don't get any output ...
10
votes
1answer
120 views

Converting text from unsupported encodings like 866 into known by Mathematica?

The list of character encodings currently supported by Mathematica is still extremely limited. For example, it supports only three standard IBM PC (OEM) code pages: ...
10
votes
1answer
154 views

Is there an efficient way to load a large list to Mathematica from R within Rlink?

I'm working on something that involves using both R and Mathematica. For this something, I first generate a large R list (1000 matrices, each 200x1000, mixed integer and real values) and then need to ...
2
votes
0answers
127 views

Animate FromQuarternionTo3DRotation nb file with 4 quarternion values

I have a csv file. Inside the csv file, there are few rows of 4 quartenion values. I would like to animate the quarternion nb in http://demonstrations.wolfram.com/FromQuaternionTo3DRotation/ I ...
1
vote
0answers
69 views

Import using POST method and web-page drill down

A response to a previous question about invoking the POST method via Mathematica was most informative in trying to further understand the intricacies of using the POST Method to obtain tabular data ...
1
vote
0answers
36 views

How to test if Import was successful? [duplicate]

I am importing and processing a bunch of files. Sometimes, for whatever reason, some of these files are not successfully imported so I'm looking for a way to Abort ...
0
votes
1answer
128 views

how to import a matlab 3 dimensional array into mathematica

I have created a three dimensional array "data" in matlab by using the following commands : ...
2
votes
1answer
82 views

Extract arguments from MeshRegion created by STL import

I've been trying to extract points and polygons from a MeshRegion expression created by importing an STL file. At first I thought I could use a simple ReplaceAll as shown below: ...
8
votes
1answer
200 views

CloudDeploy - Import[x] issue

My question is about why Import executed in Wolfram Cloud with a fixed value (see A) works and with a variable (see B) doesn't when you use the form and submit the value 5565471199 (same as the fixed ...
1
vote
1answer
99 views

Multiple Import and Export of Images

I wrote a program that imports an image and creates three new images, for example "black and white" or "grey scaled". My problem is that i work with around 200 images and it takes a long time to ...
10
votes
3answers
132 views

Unwanted extra spaces at HTML tag boundaries when using ImportString

What causes the following unexpected behavior? ...
0
votes
1answer
63 views

Exported picture has less MB than imported

I have to duplicate a picture several times – and each time the duplicate shall have another name. I do this with mathematica 10 with the following easy code: ...
0
votes
1answer
84 views

SocialMediaData[“Twitter”] - strange output

I am getting error messages when I use SocialMediaData["Twitter"]: ...
0
votes
1answer
100 views

How to import columns of data (.mat file)

I have a two 100x2 .mat file and I would like to get the elements stored as pairwise entries i.e. something like data = [{a1,b1},{a2,b2}..{a100,b100}]. Can someone help me do this efficiently?
1
vote
0answers
70 views

How to import and export msgpack?

MessagePack is an efficient binary serialization format, I find it much better than JSON. There is currently (as of v10.3) no support for this in Mathematica. Does anyone know of third party ...
1
vote
1answer
99 views

Using ReadList to import specific arrays of a multi-dimensional variable

Consider a large numerical variable (almost 1GB) which was constructed like below: output={scalar1,{Matrix1,Matrix2,Matrix3,scalar2}}; I used ...
1
vote
0answers
49 views

Error when importing XML - XMLGetString::pserr: MalformedURLException

I am getting the following error when trying to import XML: ...
4
votes
2answers
116 views

Reading an ASCII file mixing text and numerics in Mathematica

We have a sequence of large data files (LAMMPS dump files) which begin like this: ...
2
votes
0answers
99 views

Confocal Microscopy

Is it possible to direcly import Nikon ND2 files (e.g Confocal microscope 2D or 3D stacks files)? Otherwise how can we import TIFFs of 3D stack and process it as a single "entity" so to speak? ...
2
votes
1answer
100 views

How to download tables from a url?

I'm trying to import all the tables on a website, this one in particular: https://aws.amazon.com/ec2/pricing/ For local files that are already tabular, ...
4
votes
2answers
129 views

Import Data different column length

Lets assume, i have this data.txt file. s1/km t1/h s2/km t2/h 20 1 40 1 40 2 80 2 60 3 I define myself a function ...