4. plotting data

%% plotting
>>t = [0:0.01:0.98];
>>y1 = sin(2*pi*4*t); 
>>plot(t,y1);
>>y2 = cos(2*pi*4*t);
>>hold on;  % "hold off" to turn off
>>plot(t,y2,'r');
>>xlabel('time');
>>ylabel('value');
>>legend('sin','cos');
>>title('my plot');
>>print -dpng 'myPlot.png'
>>close;           % or,  "close all" to close all figs

>>figure(2), clf;  % can specify the figure number
>>subplot(1,2,1);  % Divide plot into 1x2 grid, access 1st element
>>plot(t,y1);
>>subplot(1,2,2);  % Divide plot into 1x2 grid, access 2nd element
>>plot(t,y2);
>>axis([0.5 1 -1 1]);  % change axis scale

>>%% display a matrix (or image) 
>>figure;
>>imagesc(magic(15)), colorbar, colormap gray;
>>% comma-chaining function calls.  
>>a=1,b=2,c=3
>>a=1;b=2;c=3;