Resample data points by taking average values

Hi all,

I am looking for a way to resample data points. Assuming an array with around 50 data points, what I want to achieve is the following: - between each set of two data entries (1st and 2nd, 2nd and 3rd, 3rd and 4th, etc.) I want to take the average of the two points - This average I then want to insert into the array between each two of the respective points.

What will be the simplest way to do this?

Answer 1

[Star Strider]

I would use the interp1 function:

Array = randi(100, 50, 3);
IntVct = [1:0.5:50]';
Result = interp1([1:50]', Array, IntVct);   % Output

The ‘Array’ variable here is assumed to be a (50x3) matrix. The code works without alteration if ‘Array’ is a vector. It does assume column-major orientation for a matrix. It doesn’t care about the vector being a row or column, but the output will be a column vector.

[Rafi]

Perfect. Thanks.

[Star Strider]

My pleasure!

[Image Analyst]

You can also use imresize() if you have the Image Processing Toolbox.

out = imresize(inputMatrix, [100, 100], 'Bilinear');