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What's the difference of strings within single or double quotes in groovy?
Is there any difference? Or just like javascript to let's input ' and " easier in strings?
2 Answers
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how to change default python version?
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This is probably desirable for backwards compatibility.
Python3 breaks backwards compatibility, and programs invoking 'python' probably expect python2. You probably have many programs and scripts which you are not even aware of which expect python=pyth...
Convert a matrix to a 1 dimensional array
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Either read it in with 'scan', or just do as.vector() on the matrix. You might want to transpose the matrix first if you want it by rows or columns.
> m=matrix(1:12,3,4)
> m
[,1] [,2] [,3] [,4]
[1,] 1 4 7 10
[2,] 2 5 8 11...
Difference between staticmethod and classmethod
What is the difference between a function decorated with @staticmethod and one decorated with @classmethod ?
27 Answers
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How do you create a hidden div that doesn't create a line break or horizontal space?
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@anujin: Why inline-block? The default display value for a div is block!
– MMM
Jan 29 '14 at 17:01
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What's the difference between lists and tuples?
..., while lists are homogeneous sequences. Tuples have structure, lists have order.
Using this distinction makes code more explicit and understandable.
One example would be pairs of page and line number to reference locations in a book, e.g.:
my_location = (42, 11) # page number, line number
Yo...
Fast permutation -> number -> permutation mapping algorithms
I have n elements. For the sake of an example, let's say, 7 elements, 1234567. I know there are 7! = 5040 permutations possible of these 7 elements.
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Should I use scipy.pi, numpy.pi, or math.pi?
In a project using SciPy and NumPy, should I use scipy.pi , numpy.pi , or math.pi ?
2 Answers
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Starting the week on Monday with isoWeekday()
I'm creating a calendar where I print out weeks in a tabular format. One requirement is that I be able to start the weeks either on Monday or Sunday, as per some user option. I'm having a hard time using moment's isoWeekday method.
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What does value & 0xff do in Java?
...nt literal (00 00 00 ff).
The & is applied to yield the desired value for result.
(The point is that conversion to int happens before the & operator is applied.)
1Well, not quite. The & operator works on long values as well, if either operand is a long. But not on byte. See the Java L...