how to plot a graph without using formulas

[nasi]

hi,
I am having set of values for y-axis i.e.,{-0.1,3,0.2,1.0,2.0,....n} and
x-axis w.r.t time(seconds). so for 1second the y value is -0.1.
so i want to plot the graph in this way....so can anyone help to plot such
type of graphs.

Thanks in advance.

[Alexey Balakin]

First, you should define data for plotting and fill it:

mglData y(n), x(n);
for(int i=0;i<n;i++) { y.a[i]=i*0.1-0.1; x.a[i]=i; }

Now you may define ranges for x- and y-axis

gr->XRange(x); gr->YRange(y);

and plot the data, axis and labels

gr->Plot(x,y); gr->Axis();
gr->Label('x', "time, sec"); gr->Label('y',"Data values");

For more details see documentation:
http://mathgl.sourceforge.net/mathgl_en/mathgl_en_12.html#Data-
handling and http://mathgl.sourceforge.net/mathgl_en/mathgl_en_13.html#Data-
plotting