fix call to scipy.integrate.simpson

fadin/utils/utils_simu.py

@@ -84,7 +84,7 @@ def __init__(self, custom_density, params=dict(), kernel_length=10):
     # function to normalise the pdf over chosen domain
 
     def normalisation(self, x):
-        return simpson(self.pdf(x), x)
+        return simpson(self.pdf(x), x=x)
 
     def create_cdf_ppf(self):
         # define normalization support with the given kernel length