Issue with vectors being the same length

My code seems to be having a problem with plotting. I've even tried using linspace to 'fix' xx and Vz1 but that didn't seem to work. Any suggestions would be much appreciated

Error message:

Error using plot

Vectors must be the same length.

Error in Example2 (line 244)

plot(xx,Vz1,'b-','LineWidth',2);

Lines of code to fix:

Defining xx:

               xa = 0;
                xb = 20;   
                xc = 40;    
                x1 = linspace(xa,xb,nn)';   
                x2 = linspace(xb,xc,nn)';    
                xx=[x1;x2];

Defining Vz1:

            Vz1 = 0*ones(nn,1);
            Vz2 = 0*ones(nn,1);
            Vz=[Vz1;Vz2];

Answer 1

[Walter Roberson]

                x1 = linspace(xa,xb,nn)';   
                x2 = linspace(xb,xc,nn)';    
                xx=[x1;x2];

so xx is going to be (nn x 1) + (nn x 1) = 2*nn x 1.

                Vz1 = 0*ones(nn,1);

so Vz1 is going to be nn x 1

            plot(xx,Vz1,'b-','LineWidth',2);

xx is 2*nn x 1, Vz1 is nn x 1. Different sizes.

[Rebekah Kuehl]

Thanks for explaining it!

how would you recommend that I fix this?

[Walter Roberson]

            plot(x1,Vz1,'b-','LineWidth',2);

or

            plot(xx,Vz,'b-','LineWidth',2);