parser-tutorial | https

Take a look here:

• http://mathparser.org/mxparser-tutorial/playing-with-expression-tokens/
• http://mathparser.org/mxparser-tutorial/
• http://mathparser.org/api/
• http://mathparser.org/api/org/mariuszgromada/math/mxparser/parsertokens/package-summary.html
• http://mathparser.org/api/org/mariuszgromada/math/mxparser/parsertokens/Token.html

Generally - in your example you did not define any argument. Parser will find names that are not recognized. It will give you a hint that it look like argument. Take a look on Token.looksLike field.

To define user argument follow the tutorial:

• http://mathparser.org/mxparser-tutorial/user-defined-arguments/

To get the list of missing user defined arguments take a look on Expression.getMissingUserDefinedArguments(), Expression.getMissingUserDefinedUnits(), Expression.getMissingUserDefinedFunctions()

• http://mathparser.org/api/org/mariuszgromada/math/mxparser/Expression.html#getMissingUserDefinedArguments()
• http://mathparser.org/api/org/mariuszgromada/math/mxparser/Expression.html#getMissingUserDefinedUnits()
• http://mathparser.org/api/org/mariuszgromada/math/mxparser/Expression.html#getMissingUserDefinedFunctions()

To understand the tokenTypId and tokenId study each mXparser class searching for TYPE_ID value and _ID value, for instance:

• http://mathparser.org/api/org/mariuszgromada/math/mxparser/parsertokens/BinaryRelation.html
• http://mathparser.org/api/org/mariuszgromada/math/mxparser/parsertokens/BinaryRelation.html#TYPE_ID
• http://mathparser.org/api/org/mariuszgromada/math/mxparser/Argument.html#TYPE_ID
• ...

Best regards