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Convert column classes in data.table
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For a single column:
dtnew <- dt[, Quarter:=as.character(Quarter)]
str(dtnew)
Classes ‘...
Why is SSE scalar sqrt(x) slower than rsqrt(x) * x?
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216
sqrtss gives a correctly rounded result. rsqrtss gives an approximation to the reciprocal, acc...
App Inventor 2 数学代码块 · App Inventor 2 中文网
...最多的元素 (mode)
案例：指定将二进制的某一位(Bit)改为1
案例：指定将二进制的某一位(Bit)改为0
基础数字块 ( 0 )
进制数字块 ( 0 )
等于 ( = )
不等于 ( ≠ )
大于 ( > )
大于等于 ( ≥ )
小于 ( < )
小于等于 ( ≤ )
加 (...
Slicing of a NumPy 2d array, or how do I extract an mxm submatrix from an nxn array (n>m)?
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As Sven mentioned, x[[[0],[2]],[1,3]] will give back the 0 and 2 rows that match with the 1 and 3 columns while x[[0,2],[1,3]] will return the values x[0,1] and x[2,3] in an array.
There is a helpful function for doing the first example I gave, numpy.ix_....
How do I plot in real-time in a while loop using matplotlib?
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12 Answers
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Check if at least two out of three booleans are true
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Get the week start date and week end date from week number
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Obfuscated C Code Contest 2006. Please explain sykes2.c
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Let's de-obfuscate it.
Indenting:
main(_) {
_^448 && main(-~_);
putchar(--_...
How to get all possible combinations of a list’s elements?
I have a list with 15 numbers in, and I need to write some code that produces all 32,768 combinations of those numbers.
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Filter rows which contain a certain string
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mpg cyl disp hp drat wt qsec vs am gear carb type
1 21.0 6 160.0 110 3.90 2.620 16.46 0 1 4 4 Mazda RX4
2 21.0 6 160.0 110 3.90 2.875 17.02 0 1 4 4 Mazda RX4 Wag
3 33.9 4 71.1 65 4.22 1.835 19.90 1 1 4 1 Toyota Corolla
4 21.5 4 120.1 ...