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Specifying rails version to use when creating a new application
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504
I found here an undocumented option to create a new application using an older version of Rail...
Difference between '..' (double-dot) and '…' (triple-dot) in range generation?
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5 Answers
5
Active
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String formatting in Python 3
... # '0.20'
"conversion rate: {:.2%}".format(self.goals / self.shots) # '20.45%'
"conversion rate: {:.0%}".format(self.goals / self.shots) # '20%'
"self: {!s}".format(self) # 'Player: Bob'
"self: {!r}".format(self) # '<__main__.Player instance at 0x00BF7260>'
"games: {:>3}".format(player1.g...
Apply a function to every row of a matrix or a data frame
..., byrow=TRUE)
R> M
[,1] [,2]
[1,] 1 2
[2,] 3 4
[3,] 5 6
R> apply(M, 1, function(x) 2*x[1]+x[2])
[1] 4 10 16
R>
This takes a matrix and applies a (silly) function to each row. You pass extra arguments to the function as fourth, fifth, ... arguments to apply().
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Creating a zero-filled pandas data frame
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edited Feb 9 '16 at 5:16
answered Apr 9 '14 at 13:49
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deleting rows in numpy array
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157
The simplest way to delete rows and columns from arrays is the numpy.delete method.
Suppose I ...
python pandas remove duplicate columns
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Jean-François Corbett
33.6k2525 gold badges124124 silver badges172172 bronze badges
answered Nov 5 '16 at 6:15
Gene BurinskyGene ...
How to use glOrtho() in OpenGL?
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151
Have a look at this picture: Graphical Projections
The glOrtho command produces an "Oblique" ...