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Why is SSE scalar sqrt(x) slower than rsqrt(x) * x?
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sqrtss gives a correctly rounded result. rsqrtss gives an approximation to the reciprocal, acc...
How to select rows from a DataFrame based on column values?
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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 ‘...
App Inventor 2 数学代码块 · App Inventor 2 中文网
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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
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加 (...
How do I plot in real-time in a while loop using matplotlib?
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Check if at least two out of three booleans are true
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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_....
Get the week start date and week end date from week number
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Does assignment with a comma work?
Why does aaa = 1,2,3 work and set the value of aaa to 1 ?
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Using numpy to build an array of all combinations of two arrays
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