Simple data visualization from data to create/place circles/spere on grid

all I want is to create circles (from data) on a grid for specific sets of data with different colours. These might be objects I have created to be placed on grid or from the p开发者_运维百科rogram itself. I was using POVRAY but it is massively complicated and I don't have the time. Unless anyone has a tutorial on how to read data from files and extract all the numbers and used successfully in .pov files.

There are several programs/environments (not C++) that can do this directly. One is gnuplot; another, more robust tool is R. Although with R there is a bit more of a learning curve to really get moving.

Have you considered GNUplot?

It has a simple syntax, so you can just convert your data file into an input file for gnuplot.