Basics of MATLAB and Beyond

Companion M-Files Feature 2 To label many curves on aplot it is better to put the text close to the curves themselves ratherthan in a separate legend off to one side. Legends force the eyeto make many jumps between the plot and the legend to sort outwhich line is which. Although matlab comes equipped with alegend function, I prefer to use the companion m-file curlabel,which is good especially for labelling plots which are close together:t = 0:.1:2*pi;plot(t,sin(t),t,sin(1.05*t))curlabel(’frequency = 1’)curlabel(’frequency = 1.05’)axis([0 max(t) -1 1])zeroaxesYou must use the mouse to specify the start and end points of thepointer lines. The echo from the function can be pasted into anm-file for future use.5 More Matrix AlgebraYou can multiply two matrices together using the * operator:>> a = [1 2;3 4]a =1 23 4>> b = [1 0 1 0;0 1 1 0]b =1 0 1 00 1 1 0>> a*bans =1 2 3 03 4 7 0>> u = [1 2 0 1]u =1 2 0 1>> v = [1 1 2 2]’c○ 2000 by CRC Press LLC