Is there anyway I can reduce this program to a few lines?

Hello,

I would like to reduce this program to 3 lines only or more but not explicit, Any ideas?

      x1=-3*pi:0.1:-2*pi;
      y1=-cos(x1);
      x2=-2*pi:0.1:-pi;
      y2=cos(x2);
      x3=-pi:0.1:0;
      y3=-cos(x3);
      x4=0:0.1:pi;
      y4=cos(x4);
      x5=pi:0.1:2*pi;
      y5=-cos(x5);
      x6=2*pi:0.1:3*pi;
      y6=cos(x6);
      plot(x1,y1,x2,y2,x3,y3,x4,y4,x5,y5,x6,y6)

Answer 1

[Matt J]

   x={-3*pi:0.1:-2*pi,
       -2*pi:0.1:-pi,
       -pi:0.1:0,
       0:0.1:pi,
        pi:0.1:2*pi,
        2*pi:0.1:3*pi}.';

    p=[x;cellfun(@(c,n)(-1)^n*cos(c),x,num2cell(1:6),'uni',0)];

    plot(p{:})

[Mohammed Sayan]

Thanks, Can I have them all same color?

Would you explain the last line, please?

[Matt J]

Thanks, Can I have them all same color?

I leave that as an exercise for you!

Would you explain the last line, please?

See this link

http://www.mathworks.com/help/matlab/matlab_prog/comma-separated-lists.html;jsessionid=23057bdf7751eff00581b82ee83a?s_tid=doc_12b#br2js35-13

[Mohammed Sayan]

plot(p{:},'color','r','linewidth',3)