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Why does the order of the loops affect performance when iterating over a 2D array?
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605
As others have said, the issue is the store to the memory location in the array: x[i][j]. Here'...
How to format a number as percentage in R?
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10 Answers
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Generate colors between red and green for a power meter?
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203
This should work - just linearly scale the red and green values. Assuming your max red/green/bl...
how to ignore namespaces with XPath
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answered Dec 14 '10 at 15:05
Dirk VollmarDirk Vollmar
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How to validate an Email in PHP?
...LTER_VALIDATE_EMAIL)
PHP Manual filter_var()
Available in PHP >= 5.2.0
If you don't want to change your code that relied on your function, just do:
function isValidEmail($email){
return filter_var($email, FILTER_VALIDATE_EMAIL) !== false;
}
Note: For other uses (where you need Regex)...
Truncate number to two decimal places without rounding
...eform.rounded
var with2Decimals = num.toString().match(/^-?\d+(?:\.\d{0,2})?/)[0]
rounded.value = with2Decimals
}
<form onsubmit="return calc(this)">
Original number: <input name="original" type="text" onkeyup="calc(form)" onchange="calc(form)" />
<br />"Rounded" numb...
Number.sign() in javascript
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More elegant version of fast solution:
var sign = number?number<0?-1:1:0
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Index all *except* one item in python
.... For example, to make b a copy of a without the 3rd element:
a = range(10)[::-1] # [9, 8, 7, 6, 5, 4, 3, 2, 1, 0]
b = [x for i,x in enumerate(a) if i!=3] # [9, 8, 7, 5, 4, 3, 2, 1, 0]
This is very general, and can be used with all iterables, including numpy arrays. If y...
Getting individual colors from a color map in matplotlib
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import matplotlib
cmap = matplotlib.cm.get_cmap('Spectral')
rgba = cmap(0.5)
print(rgba) # (0.99807766255210428, 0.99923106502084169, 0.74602077638401709, 1.0)
For values outside of the range [0.0, 1.0] it will return the under and over colour (respectively). This, by default, is the minimum an...
Drop rows with all zeros in pandas data frame
...ere an equivalent function for dropping rows with all columns having value 0?
12 Answers
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