I assume, you mean FEX: ScaleTime. The new version is still in the pipeline. But this works efficiently for not equally spaced data as long as X is sorted:
function Yi = myLinearInterp(X, Y, Xi)
% X and Xi are column vectors, Y a matrix with data along the columns
[dummy, Bin] = histc(Xi, X); %#ok<ASGLU>
H = diff(X); % Original step size
% Extra treatment if last element is on the boundary:
sizeY = size(Y);
if Bin(length(Bin)) >= sizeY(1)
Bin(length(Bin)) = sizeY(1) - 1;
end
Xj = Bin + (Xi - X(Bin)) ./ H(Bin);
Yi = ScaleTime(Y, Xj);
