

Department of Engineering  
University of Cambridge > Engineering Department > computing help 
Obtaining graphical output is very easy. The basic syntax is plot(x,y) which plots vector y (ordinate) against vector x (abscissa). For example to plot against t, using the vectors we have already created, type
plot(t,sint)The plot appears in a separate graphics window. Now you can add some axis labels and a rectangular grid by using menus or by typing
xlabel('t'), ylabel('sin t'), gridTo get your graph in red rather than black, and with a title, type:
plot(t,sint,'r'), title('Half period sine wave')To position text onto the graph using crosshairs the gtext command is available. Type help gtext for more information.
There are many other possibilities for controlling graphical output. You can have loglog or semilog graphs, 3D graphs of surfaces, contour plots, you can overlay various graphs on top of each other, control the axis ranges, and so on.
You can obtain hard copy of a graph (in fact, of the current contents of the Graphics Window) by typing print (or cuedpr if you want to save paper).
 computing help  