TRIQS/TRIQS — Issue #8: Legendre accumulation in SIAM : U=16, beta=100
Author: A32167
Created: 2011-11-11 18:48:11+00:00
State: open

Hi everyone,
This time another check of a single impurity: finite D=0.5, big number of steps and large U=16 and beta=100.
That's the diff in a sample script from Documentation and the one I used:

5,6c5,6
D, V, U = 1.0, 0.5, 16.0
e_f, Beta = -U/2.0, 100
---
> D, V, U = 1.0, 0.2, 4.0
> e_f, Beta = -U/2.0, 50
15c15
N_Cycles = 1000000, # Number of QMC cycles
---
> N_Cycles = 500000, # Number of QMC cycles

The result is:
![result](http://img855.imageshack.us/img855/15/screenshot20111111at193.png)

Is just that poor sampling of Legendre coefficients give this?

By the way - how to switch it off? Simple setting of "Legendre_Accumulation" to False provides an error:
numpy.linalg.linalg.LinAlgError: Singular matrix

Best regards,
Andrey