This routine defines a local coordinate system to be in effect until another coordinate system is defined or the normal coordinate system is reset. The new coordinate system is defined by specifying an origin, a point on the new x-z plane and a point on the new z-axis. These points are specified in the normal coordinate system. The options available in ioption are:

coordsys/define/x0,y0,z0/xx,xy,xz/zx,zy,zz/coordsys/ ioption

** normal** return to the normal coordinate system

** save** save the current coordinate system for recall

** restore** recall the last saved coordinate system

** define** define a new local coordinate system

`x0,y0,z0`

is the location of the new origin, `xx,xy,xz`

is a
point on the new x-z plane and `zx,zy,zz`

is a point on the new
z-axis. These points are defined with the normal coordinate system,
and used only with the ** define** option.