% mm2702.mx = linspace(0,3*pi);  % x-axis dataz1 = sin(x);           % plot in x-z planez2 = sin(2*x);z3 = sin(3*x);y1 = zeros(size(x));   % spread out along y-axesy3 = ones(size(x));    % by giving each curve different y-axis valuesy2 = y3/2;plot3(x,y1,z1,x,y2,z2,x,y3,z3)grid onxlabel('X-axis'), ylabel('Y-axis'), zlabel('Z-axis')title('Figure 27.2: sin(x), sin(2x), sin(3x)')
% plot3(x,z1,y1,x,z2,y2,x,z3,y3)% grid on% xlabel('X-axis'), ylabel('Y-axis'), zlabel('Z-axis')% title('Figure 27.3: sin(x), sin(2x), sin(3x)')