You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: onsets2parametric_mod_X.m
    path of file: ./repos/CanlabCore/CanlabCore/Model_building_tools
    
    the code of the file until where you have to start completion: function model = onsets2pa
    
function
for i = 1:nconds
    
    wh = find(delta(:, i));
    pm_u = scale(pm_vals{i}, 1);
    
    if length(wh) ~= length(pm_u)
        disp('Number of events in parametric modulator does not match number of events in delta function.')
        disp('Bad input?  Stopping in debugger so you can check.')
        keyboard
    end