Questions tagged [import]
Questions about getting data, files, images etc. from various formats into a form that can be read, tranformed and manipulated by Mathematica
1,489
questions
0
votes
0
answers
48
views
Import data problem [closed]
Here is the mat data, it comes from matlab as a struct data,
while I import in mathematica, errors happen:
There are no other careless problem because I try this many times with other mat files, I ...
- 123
0
votes
0
answers
57
views
Meshing Error on Imported obj file
I am trying to import a .obj file to be used in a static electric field simulation. I am able to successfully run the simulation with certain other aperture geometries (see here: < https://www....
- 35
2
votes
2
answers
43
views
Multiple columns from a single column of data file
Suppose I have a data file containing one column of 1000 rows having x, y, z and ϕ values. I need to separate them into four distinct columns by selecting every alternative value.
For example, if I ...
- 449
5
votes
2
answers
241
views
How to speed up loading 20k lines tsv-file with complex numbers?
I have a long (20k lines) file which looks like this:
...
- 930
2
votes
1
answer
65
views
How to import the given file?
Consider a file with the following block structure:
Event XX Muon YY:
data
End of event
Event XX' Muon YY':
data'
End of Event
...
where ...
- 3,832
10
votes
1
answer
374
views
Can Mathematica read planar graphs with pc format?
We can download files about some special planar graphs at the following website, but their files are suffixed with pc.
http://users.cecs.anu.edu.au/~bdm/data/planegraphs.html
I don't know how to ...
- 785
3
votes
1
answer
74
views
Accessing geometry in Shape files (SHP)
Shape files can readily be imported and converted to a Dataset. For large shape files, this may unnecessarily consume a large amount of memory, particularly when the dataset is only used to retrieve ...
- 3,997
0
votes
0
answers
45
views
Merge plots and imported images
I am trying to plot some things using Mathematica. I haven't used Mathematica for plotting before
, so apologies if my question is basic.
I have the following image, which is my target image:
I also ...
- 129
1
vote
1
answer
49
views
Importing IDL sav file into Mathematica
I have a rather big (around 400 MB) file written by the IDL (Interactive Data Language) software into its binary format ".SAV" which is a proprietary format, not the spss format expected by ...
- 21
0
votes
0
answers
52
views
ListLinePlot: Options expected (instead of ImportCSVToDataset
I have the following code
...
2
votes
1
answer
69
views
How to import CSV file with mixed data, including string Mathematica expressions and numbers
I am importing a CSV file that looks like this (Extract of data as viewed in Notepad):
...
- 21
3
votes
1
answer
90
views
Extremely slow import of mx files with Molecule objects [closed]
Version: 13.0.1 on Linux
Hello,
I recently found a collection of 39,361 SMILES strings that I converted to Molecule format with Mathematica. I then exported the resulting list of Molecule objects into ...
- 535
0
votes
0
answers
39
views
How do I set permission for Mathematica to import other files on my machine?
Sorry that this is a very stupid question, but when I first loaded the new version of Mathematica (13.0.1.0) it asked me to "Allow Mathematica to open files" and I accidentally clicked "...
- 1
0
votes
1
answer
68
views
I need to bulk convert a number of PDFs in a folder to plaintext
I have 159 PDF in a folder with nothing else in it. I need them all converted to raw text. I found the documentation for doing them one at a time, which worked. To do them in bulk I tried this
...
- 591
6
votes
2
answers
240
views
File Path name copy&paste- single/double backslash problem
Shift+RightClick a file on windows explorer and select 'copy as path', then ctrl+v paste to mathematica notebook, then apply FileExistsQ :
ex1)
...
- 2,877
0
votes
1
answer
32
views
How to import a file with 3 columns of numerical data and visualize it with ListPointPlot3D? [closed]
The file is plain ascii. e.g. 100 rows, each row like "1.23 2.34 3.45".
I'm a complete novice with Mathematica, I assume this will be trivial.
- 1
3
votes
1
answer
55
views
RunProcess : Save directly to Mathematica Variable
I can convert mysource.jpg to myresult.jpg using an external program myprog.exe, and set a ...
- 2,877
2
votes
1
answer
107
views
Import high-resolution images from a PDF?
I have a pdf file that I want to resize after importing.
However, ImageResize doesn't seem to take into account the high-resolution of the initial image, and resizing makes it very pixelated. I can ...
- 951
3
votes
1
answer
41
views
How to convert PQR Entity to Mathematica Molecule format
I am using the Pitt Quantum Repository and am trying to convert the format from Entity to Molecule, so that I can get the MoleculeValue Properties of the PQR chemicals in addition to the EntityValue ...
1
vote
1
answer
49
views
Using ReadList to read file with mixed size columns
I have a file which contains 6 columns but each column has a different number of entires.
The way that this file is imported into mathematica is that the 'missing' entries for each row are simply ...
- 359
0
votes
0
answers
17
views
Context problems with ParallelTable and Import/Export
I work with notebooks with contexts unique to each notebook and I want to compute a list of functions $f(z,w)$ via ParallelTable and save them to files in NotebookA ...
- 1,114
1
vote
0
answers
27
views
How to compute the electronic energy reported by Gaussian from the AlphaOrbitalEnergies
I followed the instructions on https://reference.wolfram.com/language/ref/format/FCHK.html to analyze the fchk file.
Ran an energy calculation on Gaussian , converted the results to .fchk files. The ....
0
votes
1
answer
52
views
1
vote
0
answers
27
views
How to make import and export (or equivalent) work with unique notebook contexts
I currently have my notebook's default context set to "Unique to this notebook", which is useful for when I'm doing multiple projects.
However, whenever I try to use e.g ...
- 31
0
votes
2
answers
84
views
How to create a Dataset from Nested JSON Data?
I'm importing data from Swarm into Mathematica, and I'm trying to create a dataset and having issues because the values are at different levels:
...
3
votes
1
answer
504
views
How can I resolve an unexpected character error when trying to import selected data from a large JSON file?
I'm downloading this datafile from kaggle.
I want to get all the IDs.
Normally for a JSON file I'd write
...
- 3,862
1
vote
1
answer
88
views
Create a new variable every time I import a list file
I want to import a list and put it in a variable. The number of lists grows as the days go by, so I do not know their final number.
to import the first file I use this code:
...
- 245
4
votes
4
answers
343
views
Read a txt file using space delimiter
I have a txt file "data.txt". This contain data like
a 1
b 2
c 3
I want to import this file into two list like $\{a,b,c\}$ and $\{1,2,3\}$.I have ...
- 393
1
vote
0
answers
42
views
The principle of converting image with bit 8 into image with bit 16 automatically in Mathematica
I import a collagen image that is 8-bit depth but when I checked image properties in Mathematica, it shows that it is 16 bit. My code is shown below. I found that Mathematica always imports image as ...
- 11
1
vote
0
answers
43
views
Gaussian 16 fchk and log file import in mathematica
I am working with Gaussian log files and fchk files imported into Mathematica and I noticed a few things.
The ExampleData in documentation for these files use Gaussian 03 output files, while the ...
- 535
2
votes
1
answer
58
views
Use ReadList with a condition for values of a certain column to handle huge (>1 GB) text files
Hello dear Mathematica community,
I would like to import a very large data set as efficiently as possible. The dataset consists of four columns and 115 million rows. For the display in Mathematica, ...
- 41
1
vote
0
answers
53
views
Erratic behavior retrieving large data (several tens of gigabytes) that has been serialized by Mathematica
Hardware: PC with 256GB RAM
OS: Windows 10
Mathematica: Version 13.0.1
One of my projects has led to the creation of a SparseArray whose ByteCount is ~ 35GB in RAM. At the time of creation the ...
- 2,044
3
votes
2
answers
71
views
Character encoding of the output from URLExecute
Bug persisting through 13.1.0 [CASE:4932406]
I'm using URLExecute to fetch some data from the arXiv preprint server
but it seems that the encoding of the text I ...
- 3,312
1
vote
3
answers
141
views
How to select the set of points that are real from the a txt file?
I have the following txt file. Each line (except for the first line 100 and blank line) in the txt file is a point with its real and imaginary parts. For example, the points presented in the file are
$...
- 245
0
votes
1
answer
31
views
How to read the txt as points in mathematica
I have the following txt file and want to import it as 18 points in Mathematica, so that I can draw the points on a complex plane. Each line (except for the first line ...
- 245
1
vote
0
answers
28
views
Invalid character when importing XML
I am having trouble importing XML data taken from Open Street Map.
This seems to be due to a problematic Asian character. Though the full file is quite large, here is an simplified example of the XML ...
- 393
1
vote
0
answers
51
views
Reading *ptw files into Mathematica
I have a SWIR camera that outputs raw image files in *ptw format. I need to read them into Mathematica for image analysis. I know that such files can be read into Matlab and C++, so there must be a ...
- 11
0
votes
2
answers
78
views
Plotting data and fitting to a function
I have three sets of data. I would like to plot them in the same graph. Then plot the following fittings to the data. Any help is appreciated!
f(v) = (v^2)*exp(-mv^2/2 kb T)
f(v) = (v^3)*exp(-mv^2/2 ...
2
votes
2
answers
264
views
Building a distance matrix
I came across an interesting exercise that I would like to try to solve with Mathematica to improve my skills. In data is provided to build a distance matrix. The data looks like this, starting from <...
- 45
1
vote
2
answers
84
views
Change a value within a list from a string to number
I have a table with 10 columns. The last column contains a string; e.g.,
"center", "passageway 1", up to "passageway 8".
I want to change the last column so that the ...
- 245
1
vote
2
answers
274
views
Getting stock quotes from Yahoo Finance API in Mathematica
I have obtained a Yahoo Finance API key and would like to try it out by making a simple request from within Mathematica. Their tutorial page has some nice little example code snippets in various ...
- 123
1
vote
0
answers
37
views
Failing to import a TGF file of a graph with no edges (V12.x and V13.0)
Bug persisting through 13.0
Version: 12.x and 13.0
I am having an issue with importing a graph stored in the Trivial Graph Format (TGF) when the graph has no edges. Consider the following:
...
- 225
21
votes
1
answer
930
views
Why in Mathematica 13 do imported PDFs have lower image quality?
I'm finding images imported into Mathematica 13 notebooks are noticeably pixelated. (Oddly, pasting an image into a notebook cell does not have this problem.) Has the default changed for some import ...
- 12.4k
4
votes
1
answer
66
views
How to work around HTML not importing full HTML as XMLObject
I'm trying to parse some data out of the HTML for a form. Here's a simple one
...
- 45.5k
10
votes
2
answers
446
views
ffmpeg installation Mathematica 13.0
I am trying to use the FFImport function using the ffmpeg package.
Having installed ffmpeg on our Windows 11 system (following [1]), Mathematica still does not seem to recognize the installed package.
...
- 123
5
votes
1
answer
205
views
Why does the audio become longer after importing it?
I was making a video by combining some images and this audio, when I encounter the problem:
I need to get the duration of the audio, and when I use Duration ...
- 188
3
votes
1
answer
123
views
Generic XML to Dataset
I am having trouble to transform XML data into a Mathematica Dataset of Associations. I want a dataset that follows the structure of the XML file with all its sublevels. Here is the example xml:
...
- 75
1
vote
1
answer
53
views
Extracting data from binary file without reading the whole file - is this possible? [duplicate]
Suppose I have a binary data file that holds 1 million lists each composed of five integers. i.e. $\{ x1,x2,x3,x4,x5 \}$
Perhaps I am missing something obvious (quite likely) - but if I know I want to ...
- 495
5
votes
1
answer
39
views
Importing textual data removes some letters
I have the following file TSV file p.txt containing a single line of 3 values:
"22p" "22o" "22u"...
- 347
3
votes
1
answer
63
views
Importing text generates whitespaces between every character
I have a TSV file with string data in it that I want to import. While the TSV format is correctly parsed into a Mathematica table format using ...
- 347