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Please explain some of Paul Graham's points on Lisp
... arguably does not fully satisfy the fourth point on your list, since read-time is not really open to user code; I will discuss what it would mean for this to be otherwise, though.
So, suppose we've got this code in a file somewhere and we ask Clojure to execute it. Also, let's assume (for the sake ...
How to sort Map values by key in Java?
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In a HashMap, moving from 1000 items to 10,000 doesn't really affect your time to lookup an element, but for a TreeMap the lookup time will be about 3 times slower (assuming Log2). Moving from 1000 to 100,000 will be about 6 times slower for every element lookup.
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What are dictionary view objects?
...cter of views: the keys view is not a copy of the keys at a given point in time, but rather a simple window that shows you the keys; if they are changed, then what you see through the window does change as well. This feature can be useful in some circumstances (for instance, one can work with a vie...
Learning Python from Ruby; Differences and Similarities
... whether to use map (etc) to call the method on a difference instance each time (pass an unbound method), or to keep the instance fixed and pass a different second argument each time. Both are useful.
– LaC
Jan 23 '11 at 21:38
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How often does python flush to a file?
...is buffered in memory and accumulated until the buffer is full... at which time the buffer gets "flushed" (content is written from the buffer to the file). You can explicitly flush the buffer by calling the flush() method on a file handle.
– Corey Goldberg
Mar...
How to add an extra column to a NumPy array
...And timings:
In [23]: N = 10
In [24]: a = np.random.rand(N,N)
In [25]: %timeit b = np.hstack((a,np.zeros((a.shape[0],1))))
10000 loops, best of 3: 19.6 us per loop
In [27]: %timeit b = np.zeros((a.shape[0],a.shape[1]+1)); b[:,:-1] = a
100000 loops, best of 3: 5.62 us per loop
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What’s the best way to check if a file exists in C++? (cross platform)
... network shares: "\\machine\share\this_file_doesnt_exist" => true. Last time I checked was on boost 1.33, use caution...
– rlerallut
Nov 6 '08 at 12:54
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RegEx for Javascript to allow only alphanumeric
...ng
[a-z0-9] a or b or c or ... z or 0 or 1 or ... 9
+ one or more times (change to * to allow empty string)
$ end of string
/i case-insensitive
Update (supporting universal characters)
if you need to this regexp supports universal character you can find list of unicode c...
How to change the value of ${user} variable used in Eclipse templates
...g - and doing so in Project properties like suggested above may at present time be the only way to do it.
– amn
Oct 9 '12 at 9:23
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How do I concatenate multiple C++ strings on one line?
...r_string;
Note that concatenating string literals can be done at compile time. Just remove the +.
str += "Hello World, " "nice to see you, " "or not";
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