ww2

6 ms·

1.
by ww2 8y ago
your title is more eye-catching in addition to more accurate.
2.
by ww2 8y ago
I guess the speed of APL is comparable to python rather than Fortran?
3.
by ww2 9y ago
Project Euler is a good place for teenagers to start learning programming, better than the routes of game or website design.
4.
by ww2 10y ago
But LINQ is too slow comparing to vanilla SQL.
5.
by ww2 10y ago
When you look at the GPS estimated time of arrival, or check the current MPG or mile left for your car.
6.
by ww2 10y ago
Kalman filter is a natural example of iterative algorithm. Writing it in Fold does not gain much.
7.
by ww2 10y ago
I think this is overdone and does not help the intuition. two things: (1). the first step of transposing the second matrix 90 degree is unnecessary and confusing. A row vector and a column vector are different. This step confuses the two. (
8.
by ww2 10y ago
If you compose two linear transformations into one step, and apply distributive property, you get the matrix multiplication rule. http://math.stackexchange.com/questions/31725/intuition-behi...
9.
by ww2 10y ago
stock price is about the sum of all future cash flow. not current profit level. you can have different forecasts, but you cannot say the act of making forecast itself is nonsense.
10.
by ww2 11y ago
I do not like it because http://stackoverflow.com/questions/18880654/why-do-i-get-sam...
11.
by ww2 11y ago
"Most of the stuff is rational trivia" --- rational trivia, I like the word.
12.
by ww2 11y ago
That is just the point, you dont have to limit yourself to "Pythonic". your style can be language agnostic.
13.
by ww2 11y ago
try to get the derivative of sin(x) from his approach.
14.
by ww2 11y ago
Definition 5.1/5.2 is interesting. It defines derivative at point c, not the derivative function of f. Note that f1(x) is not equal to f'(x) for all x, but f1(c) = f'(c).
15.
by ww2 12y ago
Good point but examples can also be drawn from other fields like programming rather than from mathematics. So far I found that the link below is very enlightening. http://bartoszmilewski.com/2014/10/28/categor
16.
by ww2 12y ago
Almost none of them are significant.
17.
by ww2 12y ago
There is a big gap between chapter 1 and chapter 3, which makes me doubt this book is very unrealistic. In chapter 1, it argues kids cannot follow logic, it is not trivial for them to understand the counting with rearrangement; in chapter 3
18.
by ww2 12y ago
People use R as a convenient tool.i.e., R users are tool/library users, not tool builders in general. Haskell cannot compete with R for this user base.
19.
by ww2 12y ago
one hurdle of J is that the verb train approach is too raw.
20.
by ww2 12y ago
you missed two most important methods: 5+9 = (((((((((5+1)+1)++1)+1)+1)+1)+1)+1)+1) 5+9 = 9 + 5 =...
21.
by ww2 12y ago
That is correct. Math is a language more than 'logic'/patterns'/ and any other metaphors.
22.
by ww2 12y ago
Even the music metaphor is the same. And the mention of geometry proof. The blogger is so uncreative.
23.
by ww2 12y ago
The example is too trivial. you could have 100 ways to write "hello world", but it does not matter.
24.
by ww2 12y ago
How would a functional language compiler deal with this case? like GHC?
25.
by ww2 12y ago
This is a typical pitfall of many FP code chuck examples. trading efficiency for superficial succinctness.
26.
by ww2 12y ago
learning another script language is totally different from learning Haskell. For the latter it requires much more than syntax translation, which is implied in your comment.
27.
by ww2 13y ago
Why Dorian would say something below? Asked if he was technically able to come up with the idea for bitcoin, Nakamoto responded: "Capability? Yes, but any programmer could do that." "Yes, but any programmer could do that.&quo
28.
by ww2 13y ago
I found that APL/Q/J and vim share the same required mindset. If someone loves one, it is likely he/she will like another.
29.
by ww2 13y ago
From the demo video, it seems a query language to query a database of knowledge. how's this knowledge database maintained and self updated are more interesting than the query language itself.
30.
by ww2 13y ago
Name collision with Q/kdb+.

More ›