Skip to content


NCL (NCAR Command Language) is an interpreted language designed specifically for scientific data analysis and visualization. NCAR provides official documentation regarding NCL.

Usage Summary


NCL is available on Perlmutter as part of the E4S software stack. To use:

module load e4s
spack env activate gcc
spack load --only package ncl
ncl mycode.ncl

Add -L/usr/lib64 -lX11 -lcairo -lfreetype to the link line if needed. Notice each module or spack load command above can be relatively slow since it is making lots of environment configurations.

The following is a list of related Web documentation for NCL: