Get values from a histogram without using plt

Question

Is there any way to get the values in "x" and "y" of a histogram without graphing** it? I use the function below many times (in each loop) in my code, and I noticed that my code gets slower and slower in each loop.

** I am not sure if what it does internally is to graph but I know that the slowness in my code is related to the function "plt.hist" despite using plt.close(). Thank you.

# a is a list
def function_hist(a, ini, final):

    # 12 bins
    bins = np.linspace(ini, final, 13)
    weightsa = np.ones_like(a)/float(len(a))
    y, x, _ = plt.hist(a, bins, weights = weightsa)
    plt.close()

https://stackoverflow.com/questions/17348548/any-way-to-create-histogram-with-matplotlib-pyplot-without-plotting-the-histogra — Pavel, Dec 10 '17 at 23:10
Possible duplicate of [Any way to create histogram with matplotlib.pyplot without plotting the histogram?](https://stackoverflow.com/questions/17348548/any-way-to-create-histogram-with-matplotlib-pyplot-without-plotting-the-histogra) — John Szakmeister, Dec 11 '17 at 00:08

score 10 · Answer 1 · answered Dec 11 '17 at 00:04

Use numpy.histogram

You can modify your function as below

# a is a list
def function_hist(a, ini, final):

    # 12 bins
    bins = np.linspace(ini, final, 13)
    weightsa = np.ones_like(a)/float(len(a))
    hist = np.histogram(np.array(a), bins, weights = weightsa)

Get values from a histogram without using plt

1 Answers1