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- How to detect a sign change for elements in a numpy array
Now, numpy roll does a circular shift, so if the last element has different sign than the first, the first element in the signchange array will be 1 If this is not desired, one can of course do a simple signchange[0] = 0 Also, np sign
- Randomly generate 1 or -1 (positive or negative integer)
I wanted to generate 1 or -1 in Python as a step to randomizing between non-negative and non-positive numbers or to randomly changing sign of an already existing integer What would be the best way to generate 1 or -1 in Python ?
- Filling a DataFrame with sign numbers - Stack Overflow
I have a DataFrame full of floats (positive and negative) and some NaN I'd like to replace every single float number with its sign: if it's NaN - gt; it remains Nan if positive - gt; replace with
- Efficiently detect sign-changes in python - Stack Overflow
I want to do exactly what this guy did: Python - count sign changes However I need to optimize it to run super fast In brief I want to take a time series and tell every time it crosses crosses z
- Why doesnt Python have a sign function? - Stack Overflow
The latter would be much more clear: x with the sign of y, whereas with copysign you have to remember if it's x with the sign of y or y with the sign of x! Obviously sign(x) does not provide anything more than cmp(x,0) , but it would be much more readable that this too (and for a greatly readable language like python, this would have been a big plus)
- Convert a numpy array into an array of signs with 0 as positive
I have a large numpy array with positive data, negative data and 0s I want to convert it to an array with the signs of the current values such that 0 is considered positive If I use numpy sign it returns 0 if the current value is 0 but I
- What is the @= symbol for in Python? - Stack Overflow
@=and @ are new operators introduced in Python 3 5 performing matrix multiplication They are meant to clarify the confusion which existed so far with the operator * which was used either for element-wise multiplication or matrix multiplication depending on the convention employed in that particular library code
- python - Numpy: quickest way to check if all elements in an . . .
I'm looking for an optimized or cute way of checking if all the elements of an array have the same sign (strictly) I've been thinking about doing: N all(my_array*my_array[0]>0) as it would check if all the elements have the same sign
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