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Questions tagged [data-acquisition]

Questions on the use of Mathematica to capture data from external sources.

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41 votes
2 answers
4k views

How to make a curve selectable from a scaned image and convert it to a list of coordinates

I have a scanned image (binary-ized): Is there any way to reduce one of these curved lines (full or dotted) to a series of its coordinates (e.g., sampling interval of 0.01 on x-axis)? I've read ...
Tough Kid's user avatar
  • 643
33 votes
2 answers
7k views

Streaming Data into Mathematica from a serial port

I'm attempting to see if I can capture an incoming stream of data being transmitted remotely from an arduino device into Mathematica. The plan is to connect some temperature probes to the Arduino, ...
Zviovich's user avatar
  • 9,308
27 votes
1 answer
381 views

Getting Mathematica.SE reputation data

I'm asking the following on behalf of Mr.Wizard. On StackOverflow I used the old v1.0 SO API and Mathematica to obtain user reputation data. Now we are no longer a tag on StackOverflow and the v2.1 ...
Sjoerd C. de Vries's user avatar
23 votes
3 answers
2k views

Download xkcd Click and Drag comic

Inspired by the recent question about xkcd styled plots I started looking at xkcd again and I came across a comic titled Click and Drag. And if you do that, you start exploring a larger drawing. A ...
Mr.Wizard's user avatar
  • 272k
23 votes
1 answer
2k views

Using ImageCapture to access a USB webcam in linux

Is it possible to access a USB webcam through Mathmatica on Linux? When I run ImageCapture[] I get the following output ...
Ram's user avatar
  • 231
23 votes
1 answer
4k views

Is it possible to extract data from an EPS plot not generated in Mathematica?

I want to extract data from an EPS plot not generated in Mathematica and replot it. In general is it possible to extract data from plots in any formats in Mathematica? I searched but unfortunately ...
Kheeyal's user avatar
  • 1,057
22 votes
1 answer
2k views

How to use WikiMapia as GeoServer?

I wish to use the Wikimapia map as background in GeoGraphics. According to the Wikimapia Docs, Wikimapia's URL is encoded as follows: An example Wikimapia URL is ...
Alexey Popkov's user avatar
22 votes
1 answer
897 views

Capturing Data from an Android Phone

Is there a way to capture Data from an android phone to be later analyzed in Mathematica?
Zviovich's user avatar
  • 9,308
19 votes
1 answer
2k views

Release the web camera after using CurrentImage[]

CurrentImage[] will capture an image from the webcam. It is even possible to create a live video in the notebook using ...
Szabolcs's user avatar
  • 236k
19 votes
2 answers
2k views

Data acquisition from a Measurement Computing USB device

I would like to use Mathematica 9 for to acquire data from a Measurement Computing (MC) USB-201 analog to digital (and other) device for classroom demonstration. I do not have a budget to buy LabView ...
user11839's user avatar
  • 191
16 votes
3 answers
9k views

How to request financial data from Yahoo's YQL and Quandl?

How can I download historical data from Yahoo ? Although Mathematica's FinancialData function uses Yahoo it could be useful to have more control on how to retrieve data from Yahoo's YQL. Edit ...
faysou's user avatar
  • 11k
14 votes
2 answers
616 views

Extracting data from analog screen photograph

I'm using an analog profilometer from the 1970s and need a way to digitize the data and the only way is through a photograph. I've searched but all I could find was how to extract data from computer ...
dVilhena's user avatar
  • 143
14 votes
2 answers
767 views

COVID-19 Wolfram Data Repository Retrieval

I'm using this dataset to check out the data on new COVID-19 cases. But there are two issues: Two days ago it was working great and it had data up to March 13; 1 day lag. Now when I run the cell in ...
Diffycue's user avatar
  • 1,844
14 votes
1 answer
824 views

Detecting and counting signals in list data: checking pulse rate

Hope this isn't too much of a basic question: I'm looking for some Mathematica functions, but I don't know which ones. Background I recently read about a simple technique for reading your body's ...
cormullion's user avatar
  • 24.3k
13 votes
1 answer
918 views

How can I extract data from a diagram?

Below you will see a diagram containing three curves. How can I extract data points from the three colored curves? I need to use the original data.
Winston Pan's user avatar
13 votes
1 answer
286 views

Performance-driven approach to using Big Data without killing the hard-drive

Situation A calculation has to be done in which the amount of data is too much to fit into memory. Fortunately, only a part of the overall data set has to be known at a time. The preprocessing is ...
pbx's user avatar
  • 842
12 votes
3 answers
704 views

Is it possible to import data from Google Analytics?

Using Mathematica, is it possible to pull data directly from Google Analytics? Unfortunately, GA exports messy csv files, and I was wondering if there was a direct ...
NecroTechno's user avatar
11 votes
2 answers
2k views

Mathematica TCP socket client toward Trading Platform

I'd like to connect Mathematica with my Italian electronic trading platform. To connect I need to open a TCP socket client towards the trading platform and send a string command. The high-level ...
msalese's user avatar
  • 689
10 votes
3 answers
787 views

How to make a picture grid of all Nobel Laureates in physics?

I want to make a picture grid of all Nobel Laureates in physics using mathematica. Later I wanna print this picture grid on a big wall! The first thought I came up with is to exploit the powerful ...
matheorem's user avatar
  • 17.2k
10 votes
1 answer
297 views

Importing Graphics from an Online Paper

I'm trying to reproduce a few graphs in Mathematica after running my Fortran code. Ideally, I want exact quantitative agreement with the results already published in the literature. For example, I am ...
Junaid Aftab's user avatar
  • 1,000
10 votes
3 answers
2k views

Web scraping and multi-threading in Mathematica

I'm working in some web scraping using Mathematica, and today, to speed-up the process, I used bash commands (xargs with parallel options with curl and wget) using ...
Murta's user avatar
  • 26.3k
10 votes
1 answer
952 views

Direct Pressure Data Acquisition with Mathematica and Arduino

Mathematica can upload code to the Arduino and read/write values to pins, execute commands, etc. Im trying to use this to do Direct Data Acquisition with a pressure sensor. Here is the link to the ...
user36229's user avatar
  • 101
9 votes
2 answers
874 views

What's the fastest way to read a simple numerical list?

I have a large .txt file for which I need to do some data analysis. I've been working on it for a while, and the analysis part has got faster and faster so that most of the evaluation time is now ...
Tofi's user avatar
  • 291
9 votes
1 answer
463 views

Does GeoGraphics support Elliptical Mercator projection?

When working on the answer to this question I found that GeoGraphics seemingly uses by default the Spherical Mercator projection (also known as "Web Mercator") ...
Alexey Popkov's user avatar
9 votes
1 answer
384 views

Is it possible to construct a function to make a poor man's Mathematica database?

I have a function that is set up to write to a database with 10-20 standard variables with 10 fields each, but the application is going to a place where database access is not available. Can ...
Nothingtoseehere's user avatar
8 votes
4 answers
317 views

Data Entry via 2D Graphic (formerly: Using a Slider2D to add data points to a list)

This bit of code sets up a list with the first entry already in it -- {{1,1}}: ...
GeofAndron's user avatar
8 votes
2 answers
211 views

Is it possible to verify the accuracy of a file downloaded using URLFetch

Objective: I am trying to save a HTML file using the URLFetch function (native to Mathematica 9 onward). Sometimes the file is huge. Question: Is there a way to check/verify (using the headers or ...
my account_ram's user avatar
8 votes
2 answers
184 views

How can I recover a graph from a graphical output in a notebook after resetting the kernel?

I have an old Mathematica notebook with an output for a graph structure $G$ I would like to recover. However, the routine for building up the graph is stochastic, so I can't simply rerun the code. ...
PinoAir's user avatar
  • 221
7 votes
3 answers
658 views

Import data from a current web session?

Consider opening a web session such as (Mathematica 11.3) session = StartExternalSession["WebDriver-Chrome"]; ffoxdo[cmd_] := ExternalEvaluate[session, cmd]; ...
Kagaratsch's user avatar
7 votes
1 answer
1k views

Access wi-fi raw data

I would like to know if anyone has any idea of how to access live wi-fi raw data from my computer (in monitor and promicuous mode). I would like to develop a code to get the MAC address of every ...
DMurta's user avatar
  • 343
7 votes
1 answer
447 views

Importing a Wikipedia Table as a Dataset?

I am trying to import this table from Wikipedia into Mathematica as a Dataset. The fields I'm interested are Name, ...
George's user avatar
  • 3,145
7 votes
1 answer
2k views

Using PutAppend to write large data files

I have a loop which computes a table, tab, of results at each iteration. This table is usually very large and I would like to use ...
chris's user avatar
  • 395
7 votes
1 answer
770 views

Using sockets to connect to a trading platform

I'm trying to use Binance's API. The following works: ...
anderstood's user avatar
  • 14.4k
7 votes
1 answer
640 views

How to Debug Missing[NotAvailable] error for Social Media Data

I get a Missing[NotAvailable] error message when trying to access Social Media Data using SocialMediaData["Facebook", "Friends"] ...
Igor's user avatar
  • 171
6 votes
1 answer
400 views

webscraping: Wolfram notebook vs browser

In the Netherlands there is a website Funda.nl There you can find all houses for sale or for rent. I used webscraping as a tool to collect data for analyse-purpose. The script I used is like: ...
Michiel van Mens's user avatar
6 votes
1 answer
1k views

How to plot a list of value from a .dat file?

So I received from a professor a .dat file, which does contain a quite large amount of points. The problem is this: this file is structured as I'm going to show in figure below: The first value at ...
Enrico M.'s user avatar
  • 963
6 votes
2 answers
2k views

Merging Vertices of a Graph and adding up the edges weights

I have a Weighted Graph of g which looks like this. ...
Alex's user avatar
  • 1,235
6 votes
1 answer
230 views

Export Data from several tabs in a website

Here is the website from the official federation: http://results.ittf.link/index.php?option=com_fabrik&view=list&listid=36&Itemid=158 I want to export the Data (the table). There are ...
Nam Nguyen's user avatar
  • 1,761
6 votes
1 answer
1k views

How to make Import[...., "Table"] not convert strings to numbers and not convert numbers to strings?

Bug introduced in 8 or earlier and persisting through 11.2.0 I have to to use ...
Nasser's user avatar
  • 147k
6 votes
0 answers
180 views

Connecting to Twitter API Manually in Mathematica to Pull Down All Followers of a Specified User (e.g. More than 5,000)

I have been going through old StackExchange threads to see how to potentially use Mathematica's built-in connection/authentication to the Twitter API to connect to it manually, and access some ...
Benjib's user avatar
  • 81
6 votes
0 answers
184 views

How to deal with WebServices error "any is not supported in sequence"?

I am trying to aquire data through Mathematica's WebServices and this example works just fine: ...
iav's user avatar
  • 2,016
5 votes
3 answers
3k views

Importing CSV with multiline text fields

Bug introduced in 8 or earlier and fixed in 11.2.0 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 ...
jcai's user avatar
  • 173
5 votes
1 answer
111 views

Getting error message with Search on arXiv electronic preprint database

Just installed Mathematica v10.3 which has the new option to use arXiv, the electronic database. However I get an error message using ...
thils's user avatar
  • 3,268
5 votes
1 answer
988 views

How to get the list of links in a Wikipedia article in order of appearance

I can get a list of links in a Wikipedia article using WikipediaData: ...
shrx's user avatar
  • 7,827
5 votes
1 answer
2k views

Excel DDE Link: reading and writing in real time

I'm wondering if it is possible to link Excel and Mathematica in real time, so that Mathematica can be used as a computing and "storage" tool. Suppose I have an Excel spreadsheet with an active DDE ...
Rod's user avatar
  • 3,328
5 votes
0 answers
125 views

Download binary file bypassing Import/Export? [duplicate]

Possible Duplicate: Downloading files without using Import While attempting to answer my own question I realized that I don't know a way to simply download a binary file to a specified folder ...
Mr.Wizard's user avatar
  • 272k
4 votes
1 answer
2k views

extract data from a graph image

How do I convert the following image graph into data (if possible into function)? I checked this answer and found that my problem is grid and plot have same color.
S L's user avatar
  • 731
4 votes
4 answers
1k views

How to efficiently read blank line separated data file into list of lists

For example, I have a test.dat file with contents as below: 1 2 3 4 5 6 11 22 33 44 55 66 (Note that there could be ...
matheorem's user avatar
  • 17.2k
4 votes
2 answers
545 views

Smooth curves in a raster image

I have a *.bmp image, e.g. this one: I need to smooth boundaries of the thick curves and save it in a vector graphics form. Is there a simple way how to do that in Mathematica 10? I know it is ...
T. Rihacek's user avatar
4 votes
1 answer
253 views

Why is there a lot of noise in the Wolfram Blockchain?

I tried to look into the transaction history of the Wolfram Blockchain. I tried this:- ...
H42's user avatar
  • 3,479