MATLAB: Need more data points for the plot. can’t index non whole numbers

for loopsindexing

I am running a simple step response function at certain points using 2 for loops. i am only getting 12 data points and i need much more for a smooth graph. Ive tried changing to increments of .1 but i can't index those values. Code:
   k=1;
for ksi=[0.2,0.3,0.4,0.5,0.7,0.9];
    theta = acos(ksi);
    beta = sqrt(1-ksi^2);
      for wnt = (0:12)
          y = (k-(k/beta)*(exp(-ksi*wnt))*sin(beta*wnt+theta))
          y1(wnt+1)=y;
          wnt1(wnt+1)=wnt;
      end
  plot(wnt1,y1)
thank you in advance.

Best Answer

     wntvals = linspace(0, 12, 100);
     for wntidx = 1 : length(wntvals)
          wnt = wntvals(wntidx);
          y = (k-(k/beta)*(exp(-ksi*wnt))*sin(beta*wnt+theta))
          y1(wntidx)=y;
          wnt1(wntidx)=wnt;
      end
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