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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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Convert dd-mm-yyyy string to date
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329
Split on "-"
Parse the string into the parts you need:
var from = $("#datepicker").val().spli...
Haversine Formula in Python (Bearing and Distance between two GPS points)
I would like to know how to get the distance and bearing between 2 GPS points .
I have researched on the haversine formula.
Someone told me that I could also find the bearing using the same data.
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All but last element of Ruby array
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Perhaps...
a = t # => [1, 2, 3, 4]
a.first a.size - 1 # => [1, 2, 3]
or
a.take 3
or
a.first 3
or
a.pop
which will return the last and leave the array with everything before it
or make the computer work for its dinner:
a.reverse.drop(1...
How to run cron job every 2 hours
...n I write a Crontab that will run my /home/username/test.sh script every 2 hours?
5 Answers
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Get Android API level of phone currently running my application [duplicate]
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412
Check android.os.Build.VERSION, which is a static class that holds various pieces of information...
Redirect Windows cmd stdout and stderr to a single file
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You want:
dir > a.txt 2>&1
The syntax 2>&1 will redirect 2 (stderr) to 1 (stdout). You can also hide messages by redirecting to NUL, more explanation and examples on MSDN.
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Transpose list of lists
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How about
map(list, zip(*l))
--> [[1, 4, 7], [2, 5, 8], [3, 6, 9]]
For python 3.x users can use
list(map(list, zip(*l)))
Explanation:
There are two things we need to know to understand what's going on:
The signature of zip: zip(*iterables) This means zip expects ...
JavaScript math, round to two decimal places [duplicate]
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824
NOTE - See Edit 4 if 3 digit precision is important
var discount = (price / listprice).toFixed(...
Split list into smaller lists (split in half)
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238
A = [1,2,3,4,5,6]
B = A[:len(A)//2]
C = A[len(A)//2:]
If you want a function:
def split_lis...