4.2.1 Alphanumerical evaluation

For some functions’s needs, some arguments are interpreted in alphanumerical form (strings) and not numerical form.

If the argument is a list, then each list element is interpreted as a string and all strings obtained are concatenated. During that operation, TeXgraph can encounter several cases:

Exemple(s): suppose that the macro chaine() was defined by the command "toto", and that we had created a global variable A set to 6, then the following list:

["Our friend", UpperCase(chaine()), "has ", A*A, " teeth"]

will give the string: Our friend TOTO has 36 teeth. On the contrary, if the variable A has not been defined, then the string will be Our friend TOTO has teeth, because A’s value is Nil.