Plot two sets of unequal data

I have the data sets in the attached. I need to plot them all in the same figure, with the first one being x. As you can see, the third column has much lower number of values. I guess I need to somehow have them all interpolated to the empty space between each two values is filled up? Or is there anyway Matlab can do it by some sort of function?

[John D'Errico]

How can we "see"? Have you forgotten to attach something? There are no attachments that you have provided.

[ayat]

Sorry, I saw the file successfully attached message and thought it was uploaded :D. I added the file.

Answer 1

[KSSV]

You can interpolate your data using interp1.

Read about interp1

[num,txt,raw] = xlsread('values.xls') ;

x = num(:,1) ;
y = num(:,2) ;

xi = num(:,3) ;

xi = sort(xi(~isnan(xi))) ;

yi = interp1(x,y,xi) ;

plot(x,y,'r')
hold on
plot(xi,yi,'k')

[ayat]

But this does not plot the third column though. I want the empty spaces between the values in the third columns to be filled up so they are the same number as the other two (2560).

[KSSV]

What is column 3 actually? It has any connection with column 1 or column 2?