Interpolation in mat-lab

2013 9 10
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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

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Azzi Abdelmalek
Azzi Abdelmalek 2013-9-10
Give a short sample of your data, and explain what is the problem

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Simon
Simon 2013-9-10

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

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Maayan
Maayan 2013-9-10
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
Simon 2013-9-10
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);

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