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: aamod_mapstreams.m
    path of file: ./repos/automaticanalysis/aa_modules
    
    the code of the file until where you have to start completion: % AA module - copy image orientation
% Copies image orientatio
    
function [aap,resp]=aamod_mapstreams(aap,task,i,j)

resp='';

switch task
    
    case 'report'
    case 'doit'
        
        % Reorient each stream in turn
        inputstreams=aap.tasklist.currenttask.inputstreams.stream;
        outputstreams=aap.tasklist.currenttask.outputstreams.stream;
        if (length(inputstreams)~=length(outputstreams))
            aas_log(aap,true,'Must have same number of input and output streams - check aamod_mapstreams.xml');
        end