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answered maximal matching in graph theory
Jun
26
comment anomaly detection algorithm problem
Suppose you have at least one anomaly in every 10 days, then you have no info that you could use to pinpoint on which days these anomalies did happen.
Jun
26
comment Compute ratio of a rectangle seen from an unknown perspective
That was not my point, consider square $(-1,-1,a), (1,-1,a), (1,1,a), (-1,1,a)$ and a rectangle $(-1,-1,a), (1,-1,a), (1,1,a+10), (-1,1,a+10)$ as seen from $(0,0,0)$ in direction $(0,0,1)$ where $a$ is just some positive number. These two are indistinguishable for an orthographic projection. Now, for any other projection that would render the square to a shape of size 100px x 100 px and 32bits of color (or any other constant number), you can make $a$ big enough, that they still won't be distinguishable.
Jun
26
comment Compute ratio of a rectangle seen from an unknown perspective
In general no, consider an orthographic projection, then you won't be able to distinguish between an ordinary square facing you or some angled rectangle. Now, even for a non-ortographic projection you can have distances/coefficients big enough that the slight differences will vanish because of pixels/rasterization. In other words this will effectively look like an ortographic projection and you won't be able to guess the ratio.
Jun
26
revised help with graph theory question
added 62 characters in body
Jun
25
answered help with graph theory question
Jun
25
awarded  Nice Answer
Jun
24
comment Find the maximum possible area of a certain right triangle
@MichaelChirico Thank you, the program was Inkscape.
Jun
24
answered Find the maximum possible area of a certain right triangle
Jun
23
awarded  Nice Answer
Jun
22
revised Why we use the word 'compact' for compact spaces?
deleted 4 characters in body
Jun
22
revised Why we use the word 'compact' for compact spaces?
added 154 characters in body
Jun
22
comment Why we use the word 'compact' for compact spaces?
@goblin I altered small bits to match my preferences, but your edits made it much easier to read, and you did preserve all the important things. I really appreciate it!
Jun
22
revised Why we use the word 'compact' for compact spaces?
added 250 characters in body
Jun
22
comment smoothing linear graph but keep the spikes
@Gabriel Octave is free (but there are bunch of other libraries that would do the same, for example in Python).
Jun
22
comment Why we use the word 'compact' for compact spaces?
@goblin Thank you for your kind comments. In what way would you improve the intro section?
Jun
22
comment smoothing linear graph but keep the spikes
@Gabriel You can do some FFT processing with Matlab/Octave or even with some audio software (e.g. audacity). As for the moving average for parts of the graph, how would you deal with a case such as the right diagram?
Jun
22
answered Why we use the word 'compact' for compact spaces?
Jun
22
answered smoothing linear graph but keep the spikes
Jun
21
comment Meeting of people.
I knew linear algebra will come handy (e.g. as in eventown/oddtown problems), but the exact place where $2^n$ happens surprised me, nice answer!