
plwidth: Set pen width 

DESCRIPTION:

    This function is used in examples 1,2. 

SYNOPSIS:

plwidth(width)

ARGUMENTS:

    width (PLFLT, input) :    The desired pen width.  If width is negative
    or the same as the previous value no action is taken. width = 0.
    should be interpreted as as the minimum valid pen width for the
    device.  The interpretation of positive width values is also
    device dependent. 
