The window must be defined after the viewport in order to map the world
coordinate rectangle into the viewport rectangle. The routine
<#1058#>plwind<#1058#> (page #plwind#1059>
Note that each of the arguments is a floating point number, and so the
decimal points are required. If the order of either the X~limits or
Y~limits is reversed, the corresponding axis will point in the opposite
sense, (i.e., right to left for X and top to bottom for Y). The window
must be defined before any calls to the routines which actually draw the
data points. Note however that <#870#>plwind<#870#> may also be called to change
the window at any time. This will affect the appearance of objects drawn
later in the program, and is useful for drawing two or more graphs with
different axes on the same piece of paper.