Bugfix to diff ev mcmcm proposal.

MichaelClerx · MichaelClerx · commit 7789f5a3b07a · 2018-08-24T18:04:25.000+01:00
diff --git a/pints/_mcmc/_differential_evolution.py b/pints/_mcmc/_differential_evolution.py
@@ -77,7 +77,8 @@ def ask(self):
                 self._proposed[j] = (
                     self._current[j]
                     + self._gamma * (self._current[r1] - self._current[r2])
-                    + np.random.normal(0, self._b * self._mu, self._mu.shape)
+                    + np.random.normal(
+                        0, np.abs(self._b * self._mu), self._mu.shape)
                 )
 
             # Set as read only

Original file line number	Diff line number	Diff line change
`@@ -77,7 +77,8 @@ def ask(self):`
`77`	`77`	`self._proposed[j] = (`
`78`	`78`	`self._current[j]`
`79`	`79`	`+ self._gamma * (self._current[r1] - self._current[r2])`
`80`		`- + np.random.normal(0, self._b * self._mu, self._mu.shape)`
	`80`	`+ + np.random.normal(`
	`81`	`+ 0, np.abs(self._b * self._mu), self._mu.shape)`
`81`	`82`	`)`
`82`	`83`
`83`	`84`	`# Set as read only`