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Normalize data in pandas
...ay you have values [-5,1,10] in a sample, but want to normalize based on a range of -7 to 7 (so anything above 7, our "10" is treated as a 7 effectively) with a midpoint of 2, but shrink it to fit a 256 RGB colormap:
#In[1]
NormData([-5,2,10],low=-7,center=1,hi=7,shrinkfactor=2./256)
#Out[1]
[0.127...
decimal vs double! - Which one should I use and when? [duplicate]
...uld I use a decimal
type?
decimal for when you work with values in the range of 10^(+/-28) and where you have expectations about the behaviour based on base 10 representations - basically money.
double for when you need relative accuracy (i.e. losing precision in the trailing digits on large va...
What is the fastest factorial function in JavaScript? [closed]
...one. However if you want to calculate the factorials of numbers within the range 0 to 1 (ie the gamma function) as well, then you cannot use that approach because the lookup table will have to contain infinite values.
However, you can approximate the values of the factorials, and it's pretty fast, ...
Write a number with two decimal places SQL server
...c(10,2) allows for 10 total digits with 2 places after the decimal point. Range = -99999999.99 to 99999999.99
– George Mastros
Jan 14 '09 at 2:16
...
Check if a row exists, otherwise insert
...til you commit or roll back.
The holdlock hint forces the query to take a range lock, preventing other transactions from adding a row matching your filter criteria until you commit or roll back.
The rowlock hint forces lock granularity to row level instead of the default page level, so your tran...
How do you extract a column from a multi-dimensional array?
...t;> A[:,2] # returns the third columm
array([3, 7])
See also: "numpy.arange" and "reshape" to allocate memory
Example: (Allocating a array with shaping of matrix (3x4))
nrows = 3
ncols = 4
my_array = numpy.arange(nrows*ncols, dtype='double')
my_array = my_array.reshape(nrows, ncols)
...
Colspan all columns
...
I'm a fan of colspan="42" to span the entire range. Obviously this is a problem for >42 columns, but it's one of the few magic numbers I approve of.
– Martin Carney
Jan 14 '13 at 19:43
...
What exactly is Python multiprocessing Module's .join() Method Doing?
...hronous and is not what we want (you can try):
num_processes = 5
for i in range(num_processes):
p = multiprocessing.Process(target=calculate_stuff, args=(i,))
p.start()
processes.append(p)
for p in processes:
p.join() # call to ensure subsequent line (e.g. restart_program)
...
Remove specific characters from a string in Python
...hon regular expression documentation:
Characters that are not within a range can be matched by complementing
the set. If the first character of the set is '^', all the characters
that are not in the set will be matched. For example, [^5] will match
any character except '5', and [^^] will m...
How does Python manage int and long?
...Arg_Parse*() APIs already accept long ints, as long as they are within the range representable by C ints or longs, so that functions taking C int or long argument won't have to worry about dealing with Python longs.
– cowbert
Nov 16 '18 at 6:30
...