wesley tanaka

Haskell unicode character and byte string conversions

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Breaked

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Wesley: Oh, don't step on Bunny!

Ryan: Why?

Wesley: Well, if someone stepped on you, would you like that?

Ryan: No.

Ryan: If someone stepped on me, I might get..  breaked.

Bilingual... in scare quotes

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My son, just now:

I'm humming "It's a small world" in Chinese!

He really was doing it, too.

Run "System Settings" in Ubuntu Unity from the command line

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To run "System Settings" control panel from the command line in Ubuntu, run:

unity-control-center

It is possible to launch the window with a specific group selected, like:

unity-control-center display

Setting an external monitor as default on the Ubuntu login screen

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In /etc/lightdm/lightdm.conf, add these lines to the SeatDefaults section:

[SeatDefaults]
display-setup-script=xrandr --output VGA1 --mode 1280x720 --primary
session-setup-script=xrandr --output VGA1 --mode 1280x720 --primary

If the external monitor is not detected, this may cause an error:

The system is running in low-graphics mode

Back up a git repository in a single file

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This page contains a comparison between different approaches and file formats for backing up a git repository in a single file.

Summary: The best method is probably git bundle

R quick reference cheat sheet

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Here are some notes I took while learning about R:

Workspace

  • ?matrix -- gets help on "matrix"
  • ls() -- lists variables that exist
  • rm() -- deallocates a variable

Run script from command line

Rscript hello.r

Common data types

Facepads

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Evolution of strapping a tablet on your face:

2012

Colbert iPad 2012

2014

AirVR iPad 2014

Memory usage in Haskell is difficult to predict

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Laziness [in Haskell] makes it much, much harder to reason about performance, especially space.

Consider a very long list of 'a's called long which we play with in GHC 7.6.3:

largenum = 10000000
as = repeat 'a'
long = take largenum as

Light Painting With Drones

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by Wesley Tanaka