pkgsrc/graphics/Ngraph/DESCR

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Ngraph is a software drawing scientific graphs for students, researchers,
and engineers. Ngraph makes a graph from data files written in a general
ASCII format. Fitting by a n-th polynomial, user-defined functionals is
available. Furthermore, masking invalid data, evaluation of plotted data
points, a transformation by a mathematical expression are also available.
Ngraph will assist making a scientific graph for the purpose of your
presentation, and also analysing data.