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Fast permutation -> number -> permutation mapping algorithms
...n a binary number, 'xyz' means z + 2y + 4x. For a decimal number,
it's z + 10y + 100x. Each digit is multiplied by some weight, and the results are summed. The obvious pattern in the weight is of course that the weight is w = b^k, with b the base of the number and k the index of the digit. (I will a...
Jinja2 shorthand conditional
...s to you :)
– dcohenb
Mar 15 '16 at 10:40
15
If you need to use a variable, you can use inside {%...
Most efficient way to determine if a Lua table is empty (contains no entries)?
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answered Aug 10 '09 at 1:14
Norman RamseyNorman Ramsey
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Replacing NAs with latest non-NA value
...,'a',NA,NA,NA,NA,NA,NA,NA,NA,'b','c','d',NA,NA,NA,NA,NA,'e')
xx = rep(x, 1000000)
system.time({ yzoo = na.locf(xx,na.rm=F)})
## user system elapsed
## 2.754 0.667 3.406
system.time({ yrep = repeat.before(xx)})
## user system elapsed
## 0.597 0.199 0.793
Edit
As this ...
The smallest difference between 2 Angles
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edited Oct 25 '14 at 10:51
answered Oct 23 '11 at 21:47
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How do I Geocode 20 addresses without receiving an OVER_QUERY_LIMIT response?
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answered Mar 10 '10 at 17:53
Pascal MARTINPascal MARTIN
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Can anyone explain python's relative imports?
...uldn't bother you?
– e-satis
Mar 4 '10 at 9:27
2
It seems to me that the python's idea is to use ...
Plurality in user messages
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answered Nov 23 '10 at 8:57
slebetmanslebetman
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How do I clear this setInterval inside a function?
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answered May 24 '10 at 23:50
GuffaGuffa
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Why are floating point numbers inaccurate?
... be an integer multiplied by an integer power of 2.
9.2 may be simply 92/10, but 10 cannot be expressed as 2n if n is limited to integer values.
Seeing the Data
First, a few functions to see the components that make a 32- and 64-bit float. Gloss over these if you only care about the output (ex...