histogram « numpy « Python Data Type Q&A

1. Numpy histogram of large arrays    stackoverflow.com

I have a bunch of csv datasets, about 10Gb in size each. I'd like to generate histograms from their columns. But it seems like the only way to do this in ...

2. python: using numpy.histogram    stackoverflow.com

i am using this: http://docs.scipy.org/doc/numpy/reference/generated/numpy.histogram.html i have an list a that i want to use like this:

numpy.histogram(a,bins=[0.1,0.2,0.3,0.4...6], range=[0:6])

1. how do i include a set of bins 0.1 through 6 in 0.1 intervals?
2. how ...

3. How to create the histogram of an array with masked values, in Numpy?    stackoverflow.com

In Numpy 1.4.1, what is the simplest or most efficient way of calculating the histogram of a masked array? numpy.histogram and pyplot.hist do count the masked elements, by default! The only ...

4. Calculating Histogram from one-dimensional float arrays in OpenCV    stackoverflow.com

I want to create histogram and calculate it using opencv method cv.CalcHist. But my data is one-dimensional arrays instead of IplImage objects. Why does the following code produce zero histogram?:

hist = ...

5. numpy histogram with 3x3D arrays as indices    stackoverflow.com

I've got 3x3D arrays which are the red, green and blue channels of a 3D rgb image. What is an elegant way in numpy to to create a histogram volume of ...