Object based programming

**ogpf** is an object based Fortran 2003 / Fortran 2008 code implements an interface to gnuplot. There are these main procedures in ogpf

**plot**

- plot a single vector v
- plot a vector y against vector x
- plot up to four pairs of x-y set at the same time
- plot a matrix Y versus a vector x

**surf**

- surface plot
- mesh plot
- contour plot

**script**

**meshgrid**

**linspace**

A demo file,a brief tutorial and the latest version is available at: github.