Fixed code snipped.
@@ -22,7 +22,7 @@ first order differentiation of the given random variable (<code>this</code>)
with respect to *all* its input <code>RandomVariableDifferentiableInterface</code>s (leave nodes). To get the differentiation with respect to a specific object use
Map gradient = X.getGradient();
- RandomVariableInterface derivative = X.get(Y.getID());
+ RandomVariableInterface derivative = gradient.get(Y.getID());
