How do I subtract two 2D data sets with different resolutions?

Hi,

I have two sets of data as following:

Data set 1:

P1 162x1 double

T1 162x1 double

Data set 2:

P2 2400x1 double

T2 2400x1 double

As you can see, the resolutions of these two set of data are different. I want to subtract the plot (T1,P1) from plot(T2,P2). Since the number of elements are not similar how can I do that?

Thank you

Answer 1

[Andrei Bobrov]

PP1 = interp1(T1,P1,T2);
dP21_out = P2 - PP1;

plot(T2,P2);
hold on
plot(T2,PP1);