66
votes
3
answers
627
views
Why does numpy std() give a different result to matlab std()?
I try to convert matlab code to numpy and figured out that numpy has a different result with the std function.
54
votes
7
answers
732
views
What is the equivalent of MATLAB's repmat in NumPy
I would like to execute the equivalent of the following MATLAB code using NumPy: repmat([1; 1], [1 1 1]). How
47
votes
4
answers
2.3K
views
shuffle vs permute numpy
What is the difference between numpy.random.shuffle(x) and numpy.random.permutation(x)? I have read the doc p
63
votes
9
answers
521
views
ImportError: cannot import name NUMPY_MKL
I am trying to run the following simple code import scipy scipy.test() But I am getting the following erro
55
votes
2
answers
2.6K
views
Two-sample Kolmogorov-Smirnov Test in Python Scipy
I can't figure out how to do a Two-sample KS test in Scipy. After reading the documentation scipy kstest
58
votes
4
answers
2.7K
views
How to transform numpy.matrix or array to scipy sparse matrix
For SciPy sparse matrix, one can use todense() or toarray() to transform to NumPy matrix or array. What are th
69
votes
12
answers
2.1K
views
scipy: savefig without frames, axes, only content
In numpy/scipy I have an image stored in an array. I can display it, I want to save it using savefig without a
52
votes
7
answers
653
views
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
65
votes
11
answers
1.5K
views
Principal component analysis in Python
I'd like to use principal component analysis (PCA) for dimensionality reduction. Does numpy or scipy alr
48
votes
7
answers
1K
views
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
56
votes
8
answers
786
views
How to calculate cumulative normal distribution?
I am looking for a function in Numpy or Scipy (or any rigorous Python library) that will give me the cumulativ
57
votes
6
answers
1.5K
views
binning data in python with scipy/numpy
is there a more efficient way to take an average of an array in prespecified bins? for example, i have an arra
61
votes
13
answers
534
views
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 T
49
votes
5
answers
1.3K
views
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. Wh
56
votes
9
answers
697
views
Numpy Resize/Rescale Image
I would like to take an image and change the scale of the image, while it is a numpy array. For example I hav
57
votes
6
answers
2.3K
views
How to create a density plot in matplotlib?
In R I can create the desired output by doing: data = c(rep(1.5, 7), rep(2.5, 2), rep(3.5, 8), rep(
59
votes
3
answers
2.5K
views
Confusion between numpy, scipy, matplotlib and pylab
Numpy, scipy, matplotlib, and pylab are common terms among they who use python for scientific computation. I
56
votes
14
answers
1.5K
views
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 sim
57
votes
6
answers
1.4K
views
Numpy: Divide each row by a vector element
Suppose I have a numpy array: data = np.array([[1,1,1],[2,2,2],[3,3,3]]) and I have a corresponding "vector
54
votes
2
answers
1.4K
views
Should I use scipy.pi, numpy.pi, or math.pi?
In a project using SciPy and NumPy, should I use scipy.pi, numpy.pi, or math.pi?
