In this example code, I can't get interpl or spline to produce output, whats wrong?

[Mark Lytle]

Hi all,

Here is the code I am testing with:

x=[0,.11,.15,.18,.25,.32,.35,.39,.42,.44,.48,.50];

y = [0 , 1 , 3 , 5 , 12 , 10 , 9 , 7 , 5 , 3 , 7 , 10];

figure(1)

plot(x,y);

x1=linspace(0,5,-.05);

y1 = spline(x,y,x1)

figure(2)

plot(x1,y1);

axis([0, .5, 0, 15])

y2 = interp1(x,y,x1)

figure(3)

plot(x1,y2);

axis([0, .5, 0, 15])

I do get plots for figures 2 and 3, but they are empty.

Scratching my head...How do you interpolate randomly spaced data?

Any help is appreciated...

Thanks,

Mark Lytle

Houston