linr, logr

1 files changed, 349 insertions, 0 deletions

diff --git a/R_LogR/mlclass-ex2/submitWeb.m b/R_LogR/mlclass-ex2/submitWeb.m
new file mode 100644
index 0000000..22688ac
--- /dev/null
+++ b/R_LogR/mlclass-ex2/submitWeb.m
@@ -0,0 +1,349 @@
+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 = '2';
+end
+
+function [partNames] = validParts()
+  partNames = { 'Sigmoid Function ', ...
+                'Logistic Regression Cost', ...
+                'Logistic Regression Gradient', ...
+                'Predict', ...
+                'Regularized Logistic Regression Cost' ...
+                'Regularized Logistic Regression Gradient' ...
+                };
+end
+
+function srcs = sources()
+  % Separated by part
+  srcs = { { 'sigmoid.m' }, ...
+           { 'costFunction.m' }, ...
+           { 'costFunction.m' }, ...
+           { 'predict.m' }, ...
+           { 'costFunctionReg.m' }, ...
+           { 'costFunctionReg.m' } };
+end
+
+function out = output(partId)
+  % Random Test Cases
+  X = [ones(20,1) (exp(1) * sin(1:1:20))' (exp(0.5) * cos(1:1:20))'];
+  y = sin(X(:,1) + X(:,2)) > 0;
+  if partId == 1
+    out = sprintf('%0.5f ', sigmoid(X));
+  elseif partId == 2
+    out = sprintf('%0.5f ', costFunction([0.25 0.5 -0.5]', X, y));
+  elseif partId == 3
+    [cost, grad] = costFunction([0.25 0.5 -0.5]', X, y);
+    out = sprintf('%0.5f ', grad);
+  elseif partId == 4
+    out = sprintf('%0.5f ', predict([0.25 0.5 -0.5]', X));
+  elseif partId == 5
+    out = sprintf('%0.5f ', costFunctionReg([0.25 0.5 -0.5]', X, y, 0.1));
+  elseif partId == 6
+    [cost, grad] = costFunctionReg([0.25 0.5 -0.5]', X, y, 0.1);
+    out = sprintf('%0.5f ', grad);
+  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