number « numpy « Python Data Type Q&A

1. Choosing a random sample from each row of Numpy array, excluding negative numbers    stackoverflow.com

I have a Numpy array that looks like

>>> a
array([[ 3. ,  2. , -1. ],
       [-1. ,  0.1,  3. ],
   ...

2. Sum array by number in numpy    stackoverflow.com

Assuming I have a numpy array like: [1,2,3,4,5,6] and another array: [0,0,1,2,2,1] I want to sum the items in the first array by group (the second array) and obtain n-groups results in group number order ...

3. python augmented assignment question    stackoverflow.com

i ran into something interesting about the python augmented assignment += it seems to be automatic data type conversion is not always done for a += b if a is a 'simpler' ...

4. Find large number of consecutive values fulfilling condition in a numpy array    stackoverflow.com

I have some audio data loaded in a numpy array and I wish to segment the data by finding silent parts, i.e. parts where the audio amplitude is below a certain ...

5. How to save and load an array of complex numbers using numpy.savetxt?    stackoverflow.com

I want to use numpy.savetxt() to save an array of complex numbers to a text file. Problems:

• If you save the complex array with the default format string, the imaginary ...

6. How can I multiply an specific column in an array by a number in Numpy?    stackoverflow.com

I am new to python programming. I need to do some analysis on a large dataset from a hydrolgeology field work. I am using NumPy. I want to know how I ...

7. Loss of precision with very small numbers in Python arrays    stackoverflow.com

I have two arrays in float64 type and when I assign the value of the first to the second it rounds the value. The following simple code illustrates the problem and ...

8. Sort numpy string array with negative numbers?    stackoverflow.com

I'm having a problem sorting a numpy array that has numbers as strings. I need to keep these as strings because there are other words after the integers. It's ...

9. numpy(.ma) array: Number of values since last value change?    stackoverflow.com

i have a status-signal (measured, of a heatpump) in an numpy.ma-array, together with timestamps. What i want is the lengths of the periods it was on and the length of the ...