Updated doxygen comments to reflect that erf() and erfc() can appear in expressions

openmmapi/include/openmm/CustomBondForce.h

@@ -64,7 +64,7 @@ namespace OpenMM {
  * </pre></tt>
  *
  * Expressions may involve the operators + (add), - (subtract), * (multiply), / (divide), and ^ (power), and the following
- * functions: sqrt, exp, log, sin, cos, sec, csc, tan, cot, asin, acos, atan, sinh, cosh, tanh, step.  All trigonometric functions
+ * functions: sqrt, exp, log, sin, cos, sec, csc, tan, cot, asin, acos, atan, sinh, cosh, tanh, erf, erfc, step.  All trigonometric functions
  * are defined in radians, and log is the natural logarithm.  step(x) = 0 if x is less than 0, 1 otherwise.
  */
 

openmmapi/include/openmm/CustomExternalForce.h

@@ -67,7 +67,7 @@ namespace OpenMM {
  * </pre></tt>
  *
  * Expressions may involve the operators + (add), - (subtract), * (multiply), / (divide), and ^ (power), and the following
- * functions: sqrt, exp, log, sin, cos, sec, csc, tan, cot, asin, acos, atan, sinh, cosh, tanh, step.  All trigonometric functions
+ * functions: sqrt, exp, log, sin, cos, sec, csc, tan, cot, asin, acos, atan, sinh, cosh, tanh, erf, erfc, step.  All trigonometric functions
  * are defined in radians, and log is the natural logarithm.  step(x) = 0 if x is less than 0, 1 otherwise.
  */
 

openmmapi/include/openmm/CustomGBForce.h

@@ -127,7 +127,7 @@ namespace OpenMM {
  * particular piece of the computation.
  *
  * Expressions may involve the operators + (add), - (subtract), * (multiply), / (divide), and ^ (power), and the following
- * functions: sqrt, exp, log, sin, cos, sec, csc, tan, cot, asin, acos, atan, sinh, cosh, tanh, step.  All trigonometric functions
+ * functions: sqrt, exp, log, sin, cos, sec, csc, tan, cot, asin, acos, atan, sinh, cosh, tanh, erf, erfc, step.  All trigonometric functions
  * are defined in radians, and log is the natural logarithm.  step(x) = 0 if x is less than 0, 1 otherwise.  In expressions for
  * particle pair calculations, the names of per-particle parameters and computed values
  * have the suffix "1" or "2" appended to them to indicate the values for the two interacting particles.  As seen in the above example,

openmmapi/include/openmm/CustomNonbondedForce.h

@@ -75,7 +75,7 @@ namespace OpenMM {
  * </pre></tt>
  *
  * Expressions may involve the operators + (add), - (subtract), * (multiply), / (divide), and ^ (power), and the following
- * functions: sqrt, exp, log, sin, cos, sec, csc, tan, cot, asin, acos, atan, sinh, cosh, tanh, step.  All trigonometric functions
+ * functions: sqrt, exp, log, sin, cos, sec, csc, tan, cot, asin, acos, atan, sinh, cosh, tanh, erf, erfc, step.  All trigonometric functions
  * are defined in radians, and log is the natural logarithm.  step(x) = 0 if x is less than 0, 1 otherwise.  The names of per-particle parameters
  * have the suffix "1" or "2" appended to them to indicate the values for the two interacting particles.  As seen in the above example,
  * the expression may also involve intermediate quantities that are defined following the main expression, using ";" as a separator.