How to plot this equation

Please help me how to pl开发者_运维问答ot this equation x2 = x1 + 2.5*cos(230*t) by adjusting t as t = 0:0.0001:.01.

Assuming you want a single line 2D plot and x1 is fixed, try

x1 = <put your number here>
t = 0:0.0001:.01
x2 = x1 + 2.5*cos(230*t)
plot(t, x2)

If you want something fancier like different formatting or a 3D plot, I highly recommend at least skimming through the manual. For surface or mesh plotting, you'll want to look at mesh, surface, and probably meshgrid. Matlab's rich support for plotting is one of its big selling points.