Probability distribution function in Python

Question

I know how to create an histogram in Python, but I would like that it is the probability density distribution.

Let's start with my example. I have an array d, with a size of 500000 elements. With the following code I am building a simple histogram telling me how many elements of my array d are between every bin.

max_val=log10(max(d))
min_val=log10(min(d))

logspace = np.logspace(min_val, max_val, 50)
H=hist(select,bins=logspace,histtype='step')

The problem is that this plot is not what I want. I would like to have the probability distribution function of my array d. Instead of having the number of elements of my array which are within every bins, I would like to have the probability of them being in that bin. I tried with normed=True, but that seems not working since I have bins which are equally logspaced.

You are probably using hist from matplotlib, not histogram from numpy. — Andrew Jaffe
– Andrew Jaffe, Commented Aug 15, 2011 at 8:43

Joonas Pulakka · Accepted Answer · 2011-08-15 08:35:06Z

2

It's not clear what your hist function is. If you're using NumPy's histogram, try setting density=True. See http://docs.scipy.org/doc/numpy/reference/generated/numpy.histogram.html .

answered Aug 15, 2011 at 8:35

Joonas Pulakka

36.6k29 gold badges109 silver badges171 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Andrew Jaffe Over a year ago

Matteo is probably using hist from matplotlib, not histogram from numpy.

Brian Over a year ago

Yes, I am using hist from matplotlib. I tried with histogram from numpy with density=True but I got this error: TypeError: histogram() got an unexpected keyword argument 'density'

rgbrgb Over a year ago

I got that error as well but it was fixed by updating to numpy 1.6.1.

Collectives™ on Stack Overflow

Probability distribution function in Python

1 Answer 1

3 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related