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goplot[,x],y[,linetype=ltype]
[,pointtype=ptype,dashtype=dtype]
[,color=color,legend=legend]
Adds the graph of y versus x to the previous
plot created using gplot or goplot, through the external
"gnuplot" program, if that program is available.
If only one of x and y are specified, then
it is interpreted as y and provides the y coordinates of
the data points to plot, with default x coordinates. If both are
specified, then they must have the same dimensional structure. Then
the x coordinates are taken from x and the y coordinates
are taken from y.
ltype is a positive integer that selects the line type.
ptype is a positive integer that selects the point type.
dtype is a positive integer that selects the dash type.
Depending on which of these are specified, you get a graph showing
lines, symbols, or both.
color is text specifying which color to use.
legend specifies the text with which to identify the
graph in the legend in the plot.