Sixteen real numbers that descrbe the elements of the 4x4 mapping matrix. Numbers are expected in row major order.
The mapping command allows the user to directly set the mapping matrix for the active display. The matrix specified by the mapping command is multiplied into the current mapping matrix to yield the new mapping matrix. This allows the user to specify the translation and scale of objects in a window. This command is useful in setting up a plot's appearance through a script and can be useful in movie generation through scripting.
#Multiply the current mapping matrix by the identity matrix.
mapping 1. 0. 0. 0. 0. 1. 0. 0. 0. 0. 1. 0. 0. 0. 0. 1.
#Multiply the current mapping by this matrix to zoom the
#image by 1.5 times and do some translation.