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function submitWeb(partId)
%SUBMITWEB Generates a base64 encoded string for web-based submissions
% SUBMITWEB() will generate a base64 encoded string so that you can submit your
% solutions via a web form
fprintf('==\n== [ml-class] Submitting Solutions | Programming Exercise %s\n==\n', ...
homework_id());
if ~exist('partId', 'var') || isempty(partId)
partId = promptPart();
end
% Check valid partId
partNames = validParts();
if ~isValidPartId(partId)
fprintf('!! Invalid homework part selected.\n');
fprintf('!! Expected an integer from 1 to %d.\n', numel(partNames));
fprintf('!! Submission Cancelled\n');
return
end
[login] = loginPrompt();
if isempty(login)
fprintf('!! Submission Cancelled\n');
return
end
[result] = submitSolution(login, partId, output(partId), ...
source(partId));
result = base64encode(result);
fprintf('\nSave as submission file [submit_ex%s_part%d.txt]: ', ...
homework_id(), partId);
saveAsFile = input('', 's');
if (isempty(saveAsFile))
saveAsFile = sprintf('submit_ex%s_part%d.txt', homework_id(), partId);
end
fid = fopen(saveAsFile, 'w');
if (fid)
fwrite(fid, result);
fclose(fid);
fprintf('\nSaved your solutions to %s.\n\n', saveAsFile);
fprintf(['You can now submit your solutions through the web \n' ...
'form in the programming exercises. Select the corresponding \n' ...
'programming exercise to access the form.\n']);
else
fprintf('Unable to save to %s\n\n', saveAsFile);
fprintf(['You can create a submission file by saving the \n' ...
'following text in a file: (press enter to continue)\n\n']);
pause;
fprintf(result);
end
end
% ================== CONFIGURABLES FOR EACH HOMEWORK ==================
function id = homework_id()
id = '7';
end
function [partNames] = validParts()
partNames = {
'Find Closest Centroids (k-Means)', ...
'Compute Centroid Means (k-Means)' ...
'PCA', ...
'Project Data (PCA)', ...
'Recover Data (PCA)' ...
};
end
function srcs = sources()
% Separated by part
srcs = { { 'findClosestCentroids.m' }, ...
{ 'computeCentroids.m' }, ...
{ 'pca.m' }, ...
{ 'projectData.m' }, ...
{ 'recoverData.m' } ...
};
end
function out = output(partId)
% Random Test Cases
X = reshape(sin(1:165), 15, 11);
Z = reshape(cos(1:121), 11, 11);
C = Z(1:5, :);
idx = (1 + mod(1:15, 3))';
if partId == 1
idx = findClosestCentroids(X, C);
out = sprintf('%0.5f ', idx(:));
elseif partId == 2
centroids = computeCentroids(X, idx, 3);
out = sprintf('%0.5f ', centroids(:));
elseif partId == 3
[U, S] = pca(X);
out = sprintf('%0.5f ', abs([U(:); S(:)]));
elseif partId == 4
X_proj = projectData(X, Z, 5);
out = sprintf('%0.5f ', X_proj(:));
elseif partId == 5
X_rec = recoverData(X(:,1:5), Z, 5);
out = sprintf('%0.5f ', X_rec(:));
end
end
% ========================= SUBMIT HELPERS =========================
function src = source(partId)
src = '';
src_files = sources();
if partId <= numel(src_files)
flist = src_files{partId};
for i = 1:numel(flist)
fid = fopen(flist{i});
while ~feof(fid)
line = fgets(fid);
src = [src line];
end
fclose(fid);
src = [src '||||||||'];
end
end
end
function ret = isValidPartId(partId)
partNames = validParts();
ret = (~isempty(partId)) && (partId >= 1) && (partId <= numel(partNames));
end
function partId = promptPart()
fprintf('== Select which part(s) to submit:\n', ...
homework_id());
partNames = validParts();
srcFiles = sources();
for i = 1:numel(partNames)
fprintf('== %d) %s [', i, partNames{i});
fprintf(' %s ', srcFiles{i}{:});
fprintf(']\n');
end
fprintf('\nEnter your choice [1-%d]: ', ...
numel(partNames));
selPart = input('', 's');
partId = str2num(selPart);
if ~isValidPartId(partId)
partId = -1;
end
end
function [result, str] = submitSolution(email, part, output, source)
result = ['a:5:{' ...
p_s('homework') p_s64(homework_id()) ...
p_s('part') p_s64(part) ...
p_s('email') p_s64(email) ...
p_s('output') p_s64(output) ...
p_s('source') p_s64(source) ...
'}'];
end
function s = p_s(str)
s = ['s:' num2str(numel(str)) ':"' str '";'];
end
function s = p_s64(str)
str = base64encode(str, '');
s = ['s:' num2str(numel(str)) ':"' str '";'];
end
% =========================== LOGIN HELPERS ===========================
function [login] = loginPrompt()
% Prompt for password
[login] = basicPrompt();
end
function [login] = basicPrompt()
login = input('Login (Email address): ', 's');
end
% =========================== Base64 Encoder ============================
% Thanks to Peter John Acklam
%
function y = base64encode(x, eol)
%BASE64ENCODE Perform base64 encoding on a string.
%
% BASE64ENCODE(STR, EOL) encode the given string STR. EOL is the line ending
% sequence to use; it is optional and defaults to '\n' (ASCII decimal 10).
% The returned encoded string is broken into lines of no more than 76
% characters each, and each line will end with EOL unless it is empty. Let
% EOL be empty if you do not want the encoded string broken into lines.
%
% STR and EOL don't have to be strings (i.e., char arrays). The only
% requirement is that they are vectors containing values in the range 0-255.
%
% This function may be used to encode strings into the Base64 encoding
% specified in RFC 2045 - MIME (Multipurpose Internet Mail Extensions). The
% Base64 encoding is designed to represent arbitrary sequences of octets in a
% form that need not be humanly readable. A 65-character subset
% ([A-Za-z0-9+/=]) of US-ASCII is used, enabling 6 bits to be represented per
% printable character.
%
% Examples
% --------
%
% If you want to encode a large file, you should encode it in chunks that are
% a multiple of 57 bytes. This ensures that the base64 lines line up and
% that you do not end up with padding in the middle. 57 bytes of data fills
% one complete base64 line (76 == 57*4/3):
%
% If ifid and ofid are two file identifiers opened for reading and writing,
% respectively, then you can base64 encode the data with
%
% while ~feof(ifid)
% fwrite(ofid, base64encode(fread(ifid, 60*57)));
% end
%
% or, if you have enough memory,
%
% fwrite(ofid, base64encode(fread(ifid)));
%
% See also BASE64DECODE.
% Author: Peter John Acklam
% Time-stamp: 2004-02-03 21:36:56 +0100
% E-mail: pjacklam@online.no
% URL: http://home.online.no/~pjacklam
if isnumeric(x)
x = num2str(x);
end
% make sure we have the EOL value
if nargin < 2
eol = sprintf('\n');
else
if sum(size(eol) > 1) > 1
error('EOL must be a vector.');
end
if any(eol(:) > 255)
error('EOL can not contain values larger than 255.');
end
end
if sum(size(x) > 1) > 1
error('STR must be a vector.');
end
x = uint8(x);
eol = uint8(eol);
ndbytes = length(x); % number of decoded bytes
nchunks = ceil(ndbytes / 3); % number of chunks/groups
nebytes = 4 * nchunks; % number of encoded bytes
% add padding if necessary, to make the length of x a multiple of 3
if rem(ndbytes, 3)
x(end+1 : 3*nchunks) = 0;
end
x = reshape(x, [3, nchunks]); % reshape the data
y = repmat(uint8(0), 4, nchunks); % for the encoded data
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Split up every 3 bytes into 4 pieces
%
% aaaaaabb bbbbcccc ccdddddd
%
% to form
%
% 00aaaaaa 00bbbbbb 00cccccc 00dddddd
%
y(1,:) = bitshift(x(1,:), -2); % 6 highest bits of x(1,:)
y(2,:) = bitshift(bitand(x(1,:), 3), 4); % 2 lowest bits of x(1,:)
y(2,:) = bitor(y(2,:), bitshift(x(2,:), -4)); % 4 highest bits of x(2,:)
y(3,:) = bitshift(bitand(x(2,:), 15), 2); % 4 lowest bits of x(2,:)
y(3,:) = bitor(y(3,:), bitshift(x(3,:), -6)); % 2 highest bits of x(3,:)
y(4,:) = bitand(x(3,:), 63); % 6 lowest bits of x(3,:)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Now perform the following mapping
%
% 0 - 25 -> A-Z
% 26 - 51 -> a-z
% 52 - 61 -> 0-9
% 62 -> +
% 63 -> /
%
% We could use a mapping vector like
%
% ['A':'Z', 'a':'z', '0':'9', '+/']
%
% but that would require an index vector of class double.
%
z = repmat(uint8(0), size(y));
i = y <= 25; z(i) = 'A' + double(y(i));
i = 26 <= y & y <= 51; z(i) = 'a' - 26 + double(y(i));
i = 52 <= y & y <= 61; z(i) = '0' - 52 + double(y(i));
i = y == 62; z(i) = '+';
i = y == 63; z(i) = '/';
y = z;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Add padding if necessary.
%
npbytes = 3 * nchunks - ndbytes; % number of padding bytes
if npbytes
y(end-npbytes+1 : end) = '='; % '=' is used for padding
end
if isempty(eol)
% reshape to a row vector
y = reshape(y, [1, nebytes]);
else
nlines = ceil(nebytes / 76); % number of lines
neolbytes = length(eol); % number of bytes in eol string
% pad data so it becomes a multiple of 76 elements
y = [y(:) ; zeros(76 * nlines - numel(y), 1)];
y(nebytes + 1 : 76 * nlines) = 0;
y = reshape(y, 76, nlines);
% insert eol strings
eol = eol(:);
y(end + 1 : end + neolbytes, :) = eol(:, ones(1, nlines));
% remove padding, but keep the last eol string
m = nebytes + neolbytes * (nlines - 1);
n = (76+neolbytes)*nlines - neolbytes;
y(m+1 : n) = '';
% extract and reshape to row vector
y = reshape(y, 1, m+neolbytes);
end
% output is a character array
y = char(y);
end
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