MATLAB: Is the plot not showing anything

hold on matlab loops

for ii=1:n \n
    if x(ii)<=a 
        v=((-q*b*x(ii)^2)/(12*E*I))*(3*L+3*a-2*x(ii));
        vi=((-q*b*x)/(2*E*I)).*(L+a-x);
    else
        v=((-q)/(24*E*I))*(x(ii)^4-4*L*x(ii)^3+6*L.^2*x(ii)^2-4*a.^3*x(ii)+a.^4);
        vi=((-q)/(6*E*I))*(x(ii)^3-3*L*x(ii)^2+3*L.^2*x(ii)-a.^3);
    end
end
subplot(2,1,1); plot(x,v);
title(' ');
subplot(2,1,2); plot(x,vi);
Should there be a 'hold on' somewhere in the code? Thanks

Best Answer

for ii=1:n    %EDITED
      if x(ii)<=a 
          v(ii)=((-q*b*x(ii)^2)/(12*E*I))*(3*L+3*a-2*x(ii));
          vi(ii)=((-q*b*x)/(2*E*I)).*(L+a-x);
      else
          v(ii)=((-q)/(24*E*I))*(x(ii)^4-4*L*x(ii)^3+6*L.^2*x(ii)^2-4*a.^3*x(ii)+a.^4);
          vi(ii)=((-q)/(6*E*I))*(x(ii)^3-3*L*x(ii)^2+3*L.^2*x(ii)-a.^3);
      end
  end
    plot(x(1:numel(v)),v);
    hold on
    plot(x(1:numel(vi)),vi);
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