I ran a MCMC code and after convergence is reached (with automecee), I don't undertsand why I get a cloud of points (see figure in attachment) instead of having plain disk contours (see also other attachment). On some box, I get simply a full square , not really nice ellipse or contours expected.

The script using getdist is :

Code: Select all

```
import os,sys
from getdist import plots, MCSamples
import getdist
import matplotlib.pyplot as plt
import numpy as np
import pandas as pd
# Load MCMC samples
if sys.argv[1] == 'bd':
samps = np.loadtxt('./chain_BD.txt')
# samps
samps = samps[:,0:7]
ndim = samps.shape[1]
names = ["x%s"%i for i in range(ndim)]
if sys.argv[1] == 'bd':
labels = ['\Omega_m', '\Omega_k', '\Omega_{BD}', 'H_0', '\Psi_0', '\dot{\Phi}_0', '\omega_{BD}']
samples = MCSamples(samples=samps,names = names, labels = labels)
# Triangle plot
g = plots.get_subplot_plotter()
g.triangle_plot([samples], filled=True)
g.export('./chains_final_'+str(sys.argv[1])+'.pdf')
```

Is there anyone already be faced to this issue ?

Kind regards.