how to get graph only in the 1st quadrant, ie., only in the positive x and y axis?

need graph on the + x and + y direction only

Answer 1

[KSSV]

You must know that in the first quadrant both x and y should be positive. So you need to take only positive values to plot in the first quadrant. Let x and y be your data.

% to plot only positive values
plot(abs(x),abs(y))

[Daniel]

This does not work. It does not only take the positive values it turns all values positive. If there is data that is below the x axis it'll flip up to the first quadrant. To change the scope of the plot you can use axis([xmin xmax ymin ymax]) RIGHT after plotting.