Chapter 4
The TeXgraph language

 4.1 TeXgraph commands
  4.1.1 General syntax
  4.1.2 Control structures
 4.2 Strings
  4.2.1 Alphanumerical evaluation
  4.2.2 To store a string
  4.2.3 Commands linked to strings
  4.2.4 Macros returning a string
  4.2.5 Constants and variables
  4.2.6 Predefined constants
  4.2.7 Global predefined variables
  4.2.8 Variable declaration
  4.2.9 Global variables
  4.2.10 Automatical recalculation
  4.2.11 Variables in the TeXgraph.mac and interface.mac files
 4.3 Macros
  4.3.1 Macro creation
  4.3.2 Immediate or deferred development