a new view of the proposal density as multi-modal distribution, and this can solve the problem the asymmetric problem of the Metropolis ratio for proposal in different sub-chains and in same sub-chain. Remeber, if not treat them differently, the delta_chi^2 value will be not expected.
resolve a conflict to enable merge
changed to the new Metropolis ratio expression. Hope this time it will be OK.
checked that changing sigmas in proposal density won't affect, as long as mixture is achieved.
judge from the result, this code works for both toy models, and I'm glad
Oops, typo in mixMCMC.m! check the master branch
change the expression, but not a big change
move the mixMCMC.m code to master
remove file to merge
add the mixMCMC.m file to this branch
correct Metropolis ratio! at least for the first toy model, it bahaves exactly as theoretical prediction
changed some file name and include them to index again. should use git mv next time