| Andrew Cooke | Contents | Latest | RSS | Twitter | Previous | Next

C[omp]ute

Welcome to my blog, which was once a mailing list of the same name and is still generated by mail. Please reply via the "comment" links.

Always interested in offers/projects/new ideas. Eclectic experience in fields like: numerical computing; Python web; Java enterprise; functional languages; GPGPU; SQL databases; etc. Based in Santiago, Chile; telecommute worldwide. CV; email.

Personal Projects

Lepl parser for Python.

Colorless Green.

Photography around Santiago.

SVG experiment.

Professional Portfolio

Calibration of seismometers.

Data access via web services.

Cache rewrite.

Extending OpenSSH.

C-ORM: docs, API.

Last 100 entries

Calling C From Fortran 95; Bjork DJ Set; Z3 Example With Python; Week 1; Useful Guide To Starting With IJulia; UK Election + Media; Review: Reinventing Organizations; Inline Assembly With Julia / LLVM; Against the definition of types; Dumb Crypto Paper; The Search For Quasi-Periodicity...; Is There An Alternative To Processing?; CARDIAC (CARDboard Illustrative Aid to Computation); The Bolivian Case Against Chile At The Hague; Clear, Cogent Economic Arguments For Immigration; A Program To Say If I Am Working; Decent Cards For Ill People; New Photo; Luksic And Barrick Gold; President Bachelet's Speech; Baltimore Primer; libxml2 Parsing Stream; configure.ac Recipe For Library Path; The Davalos Affair For Idiots; Not The Onion: Google Fireside Chat w Kissinger; Bicycle Wheels, Inertia, and Energy; Another Tax Fraud; Google's Borg; A Verion That Redirects To Local HTTP Server; Spanish Accents For Idiots; Aluminium Cans; Advice on Spray Painting; Female View of Online Chat From a Male; UX Reading List; S4 Subgroups - Geometric Interpretation; Fucking Email; The SQM Affair For Idiots; Using Kolmogorov Complexity; Oblique Strategies in bash; Curses Tools; Markov Chain Monte Carlo Without all the Bullshit; Email Para Matias Godoy Mercado; The Penta Affair For Idiots; Example Code To Create numpy Array in C; Good Article on Bias in Graphic Design (NYTimes); Do You Backup github?; Data Mining Books; SimpleDateFormat should be synchronized; British Words; Chinese Govt Intercepts External Web To DDOS github; Numbering Permutations; Teenage Engineering - Low Price Synths; GCHQ Can Do Whatever It Wants; Dublinesque; A Cryptographic SAT Solver; Security Challenges; Word Lists for Crosswords; 3D Printing and Speaker Design; Searchable Snowden Archive; XCode Backdoored; Derived Apps Have Malware (CIA); Rowhammer - Hacking Software Via Hardware (DRAM) Bugs; Immutable SQL Database (Kinda); Tor GPS Tracker; That PyCon Dongle Mess...; ASCII Fluid Dynamics; Brandalism; Table of Shifter, Cassette and Derailleur Compatability; Lenovo Demonstrates How Bad HTTPS Is; Telegraph Owned by HSBC; Smaptop - Sunrise (Music); Equation Group (NSA); UK Torture in NI; And - A Natural Extension To Regexps; This Is The Future Of Religion; The Shazam (Music Matching) Algorithm; Tributes To Lesbian Community From AIDS Survivors; Nice Rust Summary; List of Good Fiction Books; Constructing JSON From Postgres (Part 2); Constructing JSON From Postgres (Part 1); Postgres in Docker; Why Poor Places Are More Diverse; Smart Writing on Graceland; Satire in France; Free Speech in France; MTB Cornering - Where Should We Point Our Thrusters?; Secure Secure Shell; Java Generics over Primitives; 2014 (Charlie Brooker); How I am 7; Neural Nets Applied to Go; Programming, Business, Social Contracts; Distributed Systems for Fun and Profit; XML and Scheme; Internet Radio Stations (Curated List); Solid Data About Placebos; Half of Americans Think Climate Change Is a Sign of the Apocalypse; Saturday Surf Sessions With Juvenile Delinquents; Ssh, tty, stdout and stderr; Feathers falling in a vacuum; Santiago 30m Bike Route

© 2006-2015 Andrew Cooke (site) / post authors (content).

Plotting Data from Postgres

From: "andrew cooke" <andrew@...>

Date: Sun, 31 Aug 2008 13:16:04 -0400 (CLT)

If PL/R looks too complicated -
http://www.varlena.com/GeneralBits/Tidbits/bernier/art_66/graphingWithR.html
- then from google hits it looks like gnuplot is the best (ie most
popular) option for plotting data in Postgres.

In postgres:
\t (do this only once - it toggles)
\o plot.txt
select count(*), distance from nearest_6_100 group by distance order by
distance;
\o

In gnuplot:
set term dumb 70 24
plot 'plot.txt'

  120 ++--------A---------+----------+---------+---------+--------++
      +         +         +          +         + 'plot.txt'   A    +
      |         AA                                                 |
  100 ++      AAAAA                                               ++
      |       AAA AA                                               |
      |        AAA A A                                             |
      |       A  AAA                                               |
   80 ++      AA AAAA                                             ++
      |       A A AAA                                              |
      |     AAA     AA                                             |
   60 ++    AAA     A                                             ++
      |    AAAA      A                                             |
      |    AAA      A A                                            |
   40 ++   AA        AAA                                          ++
      |    A          AA                                           |
      |   AA          AAA                                          |
      |   AA           AA                                          |
   20 ++ AAA           AAA                                        ++
      | AAA              AAA A                                     |
      +AAA      +        AAAAAA  AA  +     A   AAAAAAAAAA+A        +
    0 AAA-------+---------+-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA-----++
      0        100       200        300       400       500       600


Andrew

With Separator

From: "andrew cooke" <andrew@...>

Date: Sun, 31 Aug 2008 13:28:17 -0400 (CLT)

Ooops.  That plotted only the first column.

What I wanted was...

In postgres:
\t
\o plot.txt
select distance, count(*) from nearest_6_100 group by distance order by
distance; (note swapped order)
\o

In gnuplot:
set datafile separator '|'
set log x
set xtics (1000,2000,3000,5000,10000)
plot [1000:10000] 'plot.txt'


  120 ++----------------A----------+-------------+----------------++
      +                 +          +             'plot.txt'   A    +
      |                 A                                          |
  100 ++                A                                         ++
      |                 A                                          |
      |                 A                                          |
      |                 AA                                         |
   80 ++                AA                                        ++
      |                 AA                                         |
      |                 AA                                         |
   60 ++               AAA                                        ++
      |                AAA                                         |
      |                AAA                                         |
   40 ++               AAA                                        ++
      |                A A                                         |
      |                A A                                         |
      |                A A                                         |
   20 ++               A A                                        ++
      |                A AA                                        |
      +                A+AA        + A          A+                 +
    0 ++--------------AA+-A--------+AAA---AA-AAAAA----------------++
     1000              2000       3000          5000             10000

(data have changed since last post).

Andrew

Comment on this post