How to relate two data by time code?

Question

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Hello! I have two set of data with different sampling rate and time stamp for each data point. I am trying to combin the two data into one matrix and the method I used is interp1 to find the corresponding data to the same time stamp data. This methos is super slow. Is there any other method I could use?

emg is data 1 and position is data 2 with 2 data at each time stamp

emg(3,:) is the time stamp for data 1

position_time is the time stamp for data 2

Thank you!

x=position_time;
tic
for n=game_start:length(emg)
    desiredXValue = emg(3,n);
    y=position(1,:);
    emg(5,n) = round(interp1(x,y, desiredXValue));
    y=position(2,:);
    emg(4,n) = round(interp1(x,y, desiredXValue));
    % y=position_time;
    % emg(6,n) = round(interp1(x,y, desiredXValue),3); % ONLY FOR TESTING
end
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