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How do I do base64 encoding on iOS?
..., 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'
};
@implementation NSString (NSStringAdditions)
+ (NSString *) base64StringFromData: (NSData *)data length: (int)length {
unsigned long ixtext, lentext;
long ctremaining;
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Remove rows with all or some NAs (missing values) in data.frame
... final[complete.cases(final), ]
gene hsap mmul mmus rnor cfam
2 ENSG00000199674 0 2 2 2 2
6 ENSG00000221312 0 1 2 3 2
na.omit is nicer for just removing all NA's. complete.cases allows partial selection by including only certain columns of the dataframe:
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How to remove a key from Hash and get the remaining hash in Ruby/Rails?
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edited Mar 20 '15 at 1:27
answered Jun 19 '12 at 17:03
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Calculate difference in keys contained in two Python dictionaries
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21 Answers
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Is log(n!) = Θ(n·log(n))?
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Remember that
log(n!) = log(1) + log(2) + ... + log(n-1) + log(n)
You can get the upper bound by
log(1) + log(2) + ... + log(n) <= log(n) + log(n) + ... + log(n)
= n*log(n)
And you can get the lower bound by doing a simil...
Why does Math.Round(2.5) return 2 instead of 3?
In C#, the result of Math.Round(2.5) is 2.
15 Answers
15
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What is the difference between '/' and '//' when used for division?
Is there a benefit to using one over the other? In Python 2, they both seem to return the same results:
13 Answers
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How do I represent a hextile/hex grid in memory?
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How to compare two strings in dot separated version format in Bash?
Is there any way to compare such strings on bash, e.g.: 2.4.5 and 2.8 and 2.4.5.1 ?
29 Answers
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how to draw smooth curve through N points using javascript HTML5 canvas?
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The problem with joining subsequent sample points together with disjoint "curveTo" type function...