Resample a matrix with a defined interval

Hello dear colleagues, i'm working with two different matrix of time v/s height. So, i want to resample the matrix by time but i dont know how.

these two matrix are the examples that i want to resample, each one is a separated example. In matrix A and B the first colum represent the time and the second the elevation. As you see in matrix A the time interval is regular (0.2), but in matrix B is not regular.

A= 

-13  -86.7
-13.2  -83
-13.4  -85
-13.6  -89
-13.8  -100.5
-14  -105.1
-14.2  -109.3
-14.4  -121
-14.6  -119.8
-14.8  -107.2
-15  -108.6
-15.2  -109.7
-15.4  -111.3
-15.6  -114.6

B=

8.6001  16.735
8.7  17.215
8.8  17.775
8.8999  18.324
9  18.932
9.1001  19.595
9.2  20.265
9.3  20.982
9.3999  21.745
9.5  22.556
9.6001  23.374
9.7  24.218
9.8  25.063
9.8999  25.918
10  26.764
10.1  27.603
10.2  28.45
10.3  29.267
10.4  30.086
10.5  31.017
10.6  32.051
10.7  33.119

What i need is to resample the matrixes by a defined time interval (instead of number of rows), for instance, for matrix A, i would like to resample the matrix based in a 0.05 time interval. And for Matrix B i would like to resample the matrix based in a 1.0 time interval.

How can i do that in matlab?

thanks in advance

Answer 1

[Azzi Abdelmalek]

You can use interp1 function to interpolate

x=A(:,1);
y=A(:,2);
xi=x(1):-0.05:x(end);
yi=interp1(x,y,xi);
new_A=[xi',yi']

[Jules Ray]

wow, thanks a lot... it works..

a question: there is a reason to put the time interval 0.05 in negative (-0.05)?

[Azzi Abdelmalek]

Your data in A are sorted in descending order, -13>-13.2

[Jules Ray]

ok thanks..