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Find a pair of elements from an array whose sum equals a given number
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validation custom message for rails 3
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edited Mar 4 '15 at 3:20
Andrew Hendrie
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an...
SQL query for today's date minus two months
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Abe MiesslerAbe Miessler
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How to initialize an array's length in JavaScript?
Most of the tutorials that I've read on arrays in JavaScript (including w3schools and devguru ) suggest that you can initialize an array with a certain length by passing an integer to the Array constructor using the var test = new Array(4); syntax.
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How to smooth a curve in the right way?
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y = np.sin(x) + np.random.random(100) * 0.2
yhat = savitzky_golay(y, 51, 3) # window size 51, polynomial order 3
plt.plot(x,y)
plt.plot(x,yhat, color='red')
plt.show()
UPDATE: It has come to my attention that the cookbook example I linked to has been taken down. Fortunately, the Savitzky-Gola...
Why can't decimal numbers be represented exactly in binary?
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364
Decimal numbers can be represented exactly, if you have enough space - just not by floating bi...
CSS: How to have position:absolute div inside a position:relative div not be cropped by an overflow:
I have 3 levels of div :
4 Answers
4
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Paperclip::Errors::MissingRequiredValidatorError with Rails 4
...nt_file_name :image, :matches => [/png\Z/, /jpe?g\Z/, /gif\Z/]
Option 3: Do not validate
If for some crazy reason (can be valid but I cannot think of one right now), you do not wish to add any content_type validation and allow people to spoof Content-Types and receive data you weren't expectin...
Uninstall old versions of Ruby gems
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663
# remove all old versions of the gem
gem cleanup rjb
# choose which ones you want to remove
gem...
Passing a dictionary to a function as keyword parameters
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edited Aug 11 '09 at 15:13
answered Dec 2 '08 at 16:53
Dav...