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: remove_key_from_data.m
    path of file: ./repos/Encryption-and-Image-Steganography-using-DWT
    
    the code of the file until where you have to start completion: function output_data = remove_key_from_data(input_data,key)
%NICHOLAS LAU

    
function output_data = remove_key_from_data(input_data,key)
%NICHOLAS LAU
%000377939
%LAST EDITED: AUG. 20, 2016
%REMOVE THE CRYPT KEY GENERATED FROM THE USER PASSWORD TO ALL VALUES
size_d = size(input_data);
size_length = size_d(1)*size_d(2);
output_data = zeros(size_d(1),size_d(2));
% input_data = int64(input_data)

for (jj=1:size_d(1))
    for(ii = 1:size_d(2))
        output_data(jj,ii) = input_data(jj,ii) - key;
    end