Plotting a histogram with python

Question

i just want to plot an very easy histogram in python, but it doesnt workt.

I am importing the data from excel via and converting it into a pd dataframe

data = pd.read_excel ("test.xlsx",sheet_name='new_tests', na_filter=True)
data_1= pd.DataFrame(data , columns=['x','y'])

x is a list of the form 1,2,3,....,100 and y are corresponding events of my modle for example 107, 208,.... and also of course 100 entries.

Now I want to plot a simple histogram with for example 10 bins - that means in the first bin are the summed events from [1,2,....,10]=[107,208,...] but

plt.hist(x,y,bins=20) doesnt work, since the plot is empty.

Answer 1

From the documentation of plt.hist

matplotlib.pyplot.hist(x, bins=None, range=None, density=False, weights=None, cumulative=False, bottom=None, histtype='bar', align='mid', orientation='vertical', rwidth=None, log=False, color=None, label=None, stacked=False, *, data=None, **kwargs)

x(n,) array or sequence of (n,) arrays Input values, this takes either a single array or a sequence of arrays which are not required to be of the same length.

binsint or sequence or str, default: rcParams["hist.bins"] (default: 10) If bins is an integer, it defines the number of equal-width bins in the range.

If bins is a sequence, it defines the bin edges, including the left edge of the first bin and the right edge of the last bin; in this case, bins may be unequally spaced. All but the last (righthand-most) bin is half-open.

Aka following the documentation, you are setting the bin edges using y. You should be just inputting the recorded data values as x inthe plt.hist function and setting the number of bins. Try:

plt.hist(y, bins=20)