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How do you match only valid roman numerals with a regular expression?
...hinking about my other problem , i decided I can't even create a regular expression that will match roman numerals (let alone a context-free grammar that will generate them)
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How to convert strings into integers in Python?
...ins lists, only one level), you could do this in Python 2:
T2 = [map(int, x) for x in T1]
In Python 3:
T2 = [list(map(int, x)) for x in T1]
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“var” or no “var” in JavaScript's “for-in” loop?
...s I show here. First, there is this approach where the iteration variable x is explicitly declared:
9 Answers
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How to convert a factor to integer\numeric without loss of information?
...nd may
happen by implicit coercion. To
transform a factor f to
approximately its original numeric
values, as.numeric(levels(f))[f] is
recommended and slightly more
efficient than
as.numeric(as.character(f)).
The FAQ on R has similar advice.
Why is as.numeric(levels(f))[f] more ef...
How does Dijkstra's Algorithm and A-Star compare?
... we only consider the distance from the source right? And the minimum vertex is taken into consideration?
– Kraken
Apr 26 '13 at 22:18
5
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How to update Python?
... in each of your conda environments to update all packages and the Python executable for that version. Also, since they changed their name to Anaconda, I don't know if the Windows registry keys are still the same.
UPDATE: 2017-03-24
There have been no updates to Python(x,y) since June of 2015, so ...
How to suppress “unused parameter” warnings in C?
...
I usually write a macro like this:
#define UNUSED(x) (void)(x)
You can use this macro for all your unused parameters. (Note that this works on any compiler.)
For example:
void f(int x) {
UNUSED(x);
...
}
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Rounded UIView using CALayers - only some corners - How?
...class:
@interface MyView : UIImageView
{
}
I'd never used graphics contexts before, but I managed to hobble together this code. It's missing the code for two of the corners. If you read the code, you can see how I implemented this (by deleting some of the CGContextAddArc calls, and deleting some ...
What is the optimal Jewish toenail cutting algorithm?
...es per foot*, so there are only 5! = 120 unrestricted sequences.
Python example:
#seq is only valid when consecutive elements in the list differ by at least two.
def isValid(seq):
for i in range(len(seq)-1):
a = seq[i]
b = seq[i+1]
if abs(a-b) == 1:
return ...
Define a lambda expression that raises an Exception
How can I write a lambda expression that's equivalent to:
6 Answers
6
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