How to extract certain indexes from a vector, but keeping the length the same by filling the rest u with NaNs

I have a vector with angles of a body segment. I have another vector with the indexes of the angles at take-off (during walking). I want select the angles at take-off only, but keeping the length of the vector the same and replacing the rest of the data of the angles to NaNs so i can still work with the time. I want to compare different time sections and if i only take out the take-off data, the vector will be smaller and i wont be able to see at what time the take-off was.

Answer 1

[Max Heimann]

You can try something like this:

angleVector = rand(1,10);
indexVector = [3 4 5 6];
nanVector = NaN(1,length(angleVector));
nanVector(indexVector) = angleVector(indexVector)

[Milena Vildósola Bustos]

Yes I think I can use this, thank you!