Interpolation in mat-lab

Hi, I have a vector with different values. Some of the values are zeros and sometimes they even come one after another. I need to plot this vector against another vector with the same size but i can't have zeros in it. What is the best way i can do some kind of interpolation to my vector and how do i do it? Thanks

[Azzi Abdelmalek]

Give a short sample of your data, and explain what is the problem

Answer 1

[Simon]

Hi!

What kind of interpolation do you need? Try "interp1"!

[Maayan]

I don't even have any idea what kind of interpolations are. My vector has intensities values of an image and eventually i will need to plot it against the time that the video lasts. I have some zeros there because in the video there are some blank frames and i don't want the plot to address them. What kind of interpolation do you think will be best here? I will also appreciate if you can explain me how to use the "interp1", i read about it but didn't understand it good enough to implement it. I'm very new with the program. thanks

[Simon]

Hi!

You have the time stamps of your frames, these are the "xi". Your "x" values are the time stamps where the frames are not blank. The "Y" are the non-zero values of your vector.

% vector of frames
vec = [1 5 6 3 0 4 0 5 7 0 3];

% set vector of time staps, fill in your values
xi = [1 2 3 4 5 6 7 8 9 10 11];

% get non-blank frames, fill in your vector values
nonblankframe = find(vec > 0);

% vector to interpolate
Y = vec(nonblankframe);

% time stamps of non blank frames
x = timestamps(nonblankframe);

% interpolate
yi = interp1(x,Y,xi);