Can I use interpolation to small scale?

I usually use interp1 function to stratch data.

But now, i want shortening data and I'cant use interp1.

Results.Volume(:,1)= interp1(1:length(VOL),VOL,1:7200)';

=>length(VOL) = 8003

help me please!

Answer 1

[Askic V]

Not really sure if I understood your question, but if you want less data points within the same interval, then just use interp1. Here is one example:

close all
x = linspace(0, 10, 100); % 100 points between 0 and 10
y = sin(x * 2);
plot(x,y)
hold on
% 2 times smaller in size
xi = linspace (0,10,50); % 50 points between 0 and 10
yi = interp1(x, y, xi, 'linear');
plot(xi,yi,'r')

[승현 이]

I applogize my English!

I'd like to change the Y values for X of 1:8003 to the new Y2 for X2 of 1:7200.

If it works well,

plot(X2,Y2) will be overlapping plot(X,Y)

Thank you

[승현 이]

I solved problem using resample function.

Thank you for kind answer