## Fix Python – How to get the indices list of all NaN value in numpy array?

Say now I have a numpy array which is defined as,
[[1,2,3,4],
[2,3,NaN,5],
[NaN,5,2,3]]

Now I want to have a list that contains all the indices of the missing values, which is [(1,2),(2,0)] at this case.
Is there any way I can do that?
….

## Fix Python – How to calculate probability in a normal distribution given mean & standard deviation?

How to calculate probability in normal distribution given mean, std in Python? I can always explicitly code my own function according to the definition like the OP in this question did: Calculating Probability of a Random Variable in a Distribution in Python
Just wondering if there is a library function call will allow you to do this. In my imagin….

## Fix Python – Histogram Matplotlib

So I have a little problem. I have a data set in scipy that is already in the histogram format, so I have the center of the bins and the number of events per bin. How can I now plot is as a histogram. I tried just doing
bins, n=hist()

but it didn’t like that. Any recommendations?
….

## Fix Python – How can I perform two-dimensional interpolation using scipy?

This Q&A is intended as a canonical(-ish) concerning two-dimensional (and multi-dimensional) interpolation using scipy. There are often questions concerning the basic syntax of various multidimensional interpolation methods, I hope to set these straight too.

I have a set of scattered two-dimensional data points, and I would like to plot them as ….

## Fix Python – Plotting a fast Fourier transform in Python

I have access to NumPy and SciPy and want to create a simple FFT of a data set. I have two lists, one that is y values and the other is timestamps for those y values.
What is the simplest way to feed these lists into a SciPy or NumPy method and plot the resulting FFT?
I have looked up examples, but they all rely on creating a set of fake data with….

## Fix Python – ImportError in importing from sklearn: cannot import name check_build

I am getting the following error while trying to import from sklearn:
>>> from sklearn import svm

Traceback (most recent call last):
File ““, line 1, in
from sklearn import svm
File “C:\Python27\lib\site-packages\sklearn\__init__.py”, line 16, in
from . import check_build
ImportError: cannot import name che….

## Fix Python – Can’t install Scipy through pip

When installing scipy through pip with :
pip install scipy

Pip fails to build scipy and throws the following error:
Cleaning up…

## Fix Python – How to check BLAS/LAPACK linkage in NumPy and SciPy?

I am builing my numpy/scipy environment based on blas and lapack more or less based on this walk through.
When I am done, how can I check, that my numpy/scipy functions really do use the previously built blas/lapack functionalities?
….

## Fix Python – Confusion between numpy, scipy, matplotlib and pylab

Numpy, scipy, matplotlib, and pylab are common terms among they who use python for scientific computation.
I just learn a bit about pylab, and I got confused.
Whenever I want to import numpy, I can always do:
import numpy as np

I just consider, that once I do
from pylab import *

the numpy will be imported as well (with np alias). So basically th….

## Fix Python – Multiple linear regression in Python

I can’t seem to find any python libraries that do multiple regression. The only things I find only do simple regression. I need to regress my dependent variable (y) against several independent variables (x1, x2, x3, etc.).
For example, with this data:
print ‘y x1 x2 x3 x4 x5 x6 x7’
for t in texts:
print “….