The structure class
basic-graph-spec provides a mechanism to simplify generating a graph of a mathematical function which maps x to y. Create it with make-basic-graph-spec.
basic-graph-spec mechanism is intended to make it simpler to repeatedly compute graphs for a function with values that may change. It is a thin layer, and you can implement you own version using generate-graph-from-pairs.
basic-graph-spec is a structure type, and can be included in structures your define to extend the functionality.
CAPI User Guide and Reference Manual (Unix version) - 25 Feb 2015