Interpolation of unequally spaced data

I have a small set of (x,y) data points which are not evenly spaced. I want to interpolate the data for some analysis work.With very few points I am unable to work out.I cant use interp1 for the data is not evenly spaced.ANY SUGGESTIONS ?

3425.0 12.5 825.0 25 200 37.5 75 50 25 62.5 12.5 75

[Image Analyst]

Please supply the x locations, and the y values of your input data. Then supply us the x locations of the places where you want your estimated output y values.

[John D'Errico]

It is simply NOT true that you cannot use interp1. READ THE HELP.

Answer 1

[Star Strider]

Your data do not have to be evenly spaced to use interp1.

For example:

x = sort(unique(randi(50,1,10)));
y = randi(10,1,length(x));

xi = linspace(0,max(x),15);
yi = interp1(x,y,xi,'linear');

figure(1)
plot(x,y,'-*b')
hold on
plot(xi,yi,'pr')
hold off
grid
legend('Original','Interpolated')

[Image Analyst]

It's not clear, but his xi might also be randomly located (that's why I asked), but your code should also work with

xi = sort(unique(randi(50,1,10)));

just as well, since, like John said, there's no reason interp1 won't work with randomly located data.