Sariel's blog
Describing his unhappiness over the shogunate’s signing treaties with barbarians, a development for which he had no excuse to offer the gods or his ancestors, he mentioned his reluctance to send Kazunomiya, the daughter of an emperor, to a part of Japan where foreigners roamed.
Men reading tweets insulting women to their faces. m.youtube.com/watch?v=9tU-D-…
Exciting news on the Erdos-Szekeres convex polygon problem. arxiv.org/abs/1604.08657
Sanders to declare victory and withdraw from the Democratic party.
Not creepy at all… twitter.com/ABC/status/722…
“Your lie in April” en.wikipedia.org/wiki/Your_Lie_…
Michigan governor to fly over Flint and inspect the devastation through the window. twitter.com/nytimes/status…
Via reddit. North Korea is a horrible dictatorship where you only get to pick one person as a leader, not like the US where we get two.
Student that got into all ivies. I suggest a reality show “the Bachelorette” following her as she choses the one.
nyti.ms/1MSRmPp
So, after 20 years I decided to jump from tcsh to bash. Happy I did – the way of bash is strange, but everything is answered in stack-exchange (to the point that I don’t even try to figure out how to do simple things – just search the web for it). Furthermore, it is a way better scripting language with functions and stuff, and also clearly it is more complete. Oh, and it is even coming to windows 10, natively, any day now.
14% of Hispanics view Trump favorably. That sounds too high to me… washingtonpost.com/blogs/plum-lin…
I put my talk from SODA 16 on youtube (the audio quality is not great, but whatever):
The slides are available here.
So, creating a vector animation for talks, once you have a pdf with each page being a frame of the animation is not hard, see here for details.
The question remain, how do we generate such a pdf to begin with? One way is by using a drawing program. Ipe is a good candidate, but creating such figures can be tedious, to put it mildly. In some cases (and you might want to sit before reading the rest of this sentence) there is really no better alternative to… doing some real programming!
Luckily, there is a light graphics library, specifically Cairo, that is happy to output directly to pdf (or svg) files, generating true vector drawings – which are both small, and of higher quality than the “standard” bitmap output (yuck).
Of course, you might want to have an interactive program, with a window and stuff, and output to pdf/svg only when you are happy with the results. Cairo is happy to let you do that – the same drawing code can be used to output to the screen, or to a pdf (or svg). Once you have a pdf, you can easily convert the figure to ipe, and edit the figure directly (using pdftoipe).
As a demonstration of the above, here is the source code of an interactive program I wrote (that I used to generate the above figure). Its a C++ program for linux, using gtk, cairo, and CGAL (because life is too short to implement 2d point class yet again). If this sounds like many libraries one needs, on Debian/Ubiuntu this just requires installing the relevant packages (you would also need the pkg-config package — a nice programming tool). The program is self explanatory as far as what keys do.
And a final comment — to force cairo to output the current image to a new page in the pdf file, one need to use cairo_show_page.
Word of the day: Trilateration.
en.wikipedia.org/wiki/Trilatera…
Kung Fu fight between a man and a cow… youtube.com/watch?v=LxXjsQ…
How could the ancient Greek mathematicians be so smart, and yet so stupid?
Drinking the kool-aid… en.m.wikipedia.org/wiki/Drinking_…
The Serial Swatter… mobile.nytimes.com/2015/11/29/mag…
Red mercury – the WMD every self respecting terrorist should have. nytimes.com/2015/11/22/mag…
The conference will be held in the very centre of Prague, Czech Republic, in the historical building Karolinum of Charles University. The date is 23-28th July 2016, which is immediately after European Congress of Mathematics.
More details here.
iff according to dictionary: “IFF Identification, Friend or Foe: an electronic system for recognition of friendly aircraft, ships, etc.
