Questions tagged [data-acquisition]
Questions on the use of Mathematica to capture data from external sources.
31
questions
40
votes
2
answers
3k
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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 ...
- 633
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
...
- 61.3k
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
...
- 232k
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 ...
- 11k
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 ...
- 173
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, ...
- 9,258
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 ...
- 1,057
22
votes
1
answer
892
views
Capturing Data from an Android Phone
Is there a way to capture Data from an android phone to be later analyzed in Mathematica?
- 9,258
7
votes
1
answer
736
views
Using sockets to connect to a trading platform
I'm trying to use Binance's API. The following works:
...
- 14.1k
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 ...
- 269k
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 ...
- 689
9
votes
2
answers
781
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 ...
- 291
7
votes
1
answer
430
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, ...
- 3,095
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 ...
- 395
6
votes
1
answer
220
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 ...
- 1,751
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
...
- 231
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 ...
- 191
14
votes
2
answers
756
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 ...
- 1,721
14
votes
1
answer
815
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 ...
- 24.2k
13
votes
2
answers
595
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 ...
- 133
10
votes
3
answers
751
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 ...
- 16.9k
10
votes
1
answer
944
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 ...
- 101
9
votes
1
answer
430
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") ...
- 61.3k
8
votes
4
answers
313
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}}:
...
- 321
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 ...
- 135k
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 ...
- 3,298
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 ...
- 16.9k
3
votes
1
answer
1k
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.
- 721
3
votes
1
answer
279
views
Parsing JavaScript Script from XML Trees
I've been trying to parse some script written in JavaScript while scraping a website, and am a little confused what functions are needed to get this done in Mathematica.
I imported the data using <...
- 647
2
votes
3
answers
115
views
Import data from different webpages of the same website
I imported and cleaned the following datasets for england soccer league in order to have home/away rank tables and next round matches:
...
- 401
1
vote
1
answer
717
views
Extract data from an image of a density plot?
I have a density plot in image form and would like to extract the data points from it. How would I go about using Mathematica to accomplish this? My ideal output ...
- 1,860