update doc

Author: farbod-farshidian

ocs2_core/include/ocs2_core/constraint/StateConstraintCollection.h

@@ -55,7 +55,7 @@ class StateConstraintCollection : public Collection<StateConstraint> {
   /** Returns the number of active constraints at a given time for each term. If a term is inactive, its size is zero. */
   size_array_t getTermsSize(scalar_t time) const;
 
-  /** Get an array of all constraints */
+  /** Get an array of all constraints. If a term is inactive, the corresponding element is a vector of size zero. */
   virtual vector_array_t getValue(scalar_t time, const vector_t& state, const PreComputation& preComp) const;
 
   /** Get the constraint linear approximation */

ocs2_core/include/ocs2_core/constraint/StateInputConstraintCollection.h

@@ -55,7 +55,7 @@ class StateInputConstraintCollection : public Collection<StateInputConstraint> {
   /** Returns the number of active constraints at a given time for each term. If a term is inactive, its size is zero. */
   size_array_t getTermsSize(scalar_t time) const;
 
-  /** Get an array of all constraints */
+  /** Get an array of all constraints. If a term is inactive, the corresponding element is a vector of size zero. */
   virtual vector_array_t getValue(scalar_t time, const vector_t& state, const vector_t& input, const PreComputation& preComp) const;
 
   /** Get the constraint linear approximation */