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Email feature extraction

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neingeist 2014-11-13 23:50:52 +01:00
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ex6/emailFeatures.m
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@ -1,8 +1,8 @@
function x = emailFeatures(word_indices)
%EMAILFEATURES takes in a word_indices vector and produces a feature vector
%from the word indices
% x = EMAILFEATURES(word_indices) takes in a word_indices vector and
% produces a feature vector from the word indices.
% x = EMAILFEATURES(word_indices) takes in a word_indices vector and
% produces a feature vector from the word indices.
% Total number of words in the dictionary
n = 1899;
@ -12,20 +12,20 @@ x = zeros(n, 1);
% ====================== YOUR CODE HERE ======================
% Instructions: Fill in this function to return a feature vector for the
% given email (word_indices). To help make it easier to
% given email (word_indices). To help make it easier to
% process the emails, we have have already pre-processed each
% email and converted each word in the email into an index in
% a fixed dictionary (of 1899 words). The variable
% word_indices contains the list of indices of the words
% which occur in one email.
%
%
% Concretely, if an email has the text:
%
% The quick brown fox jumped over the lazy dog.
%
% Then, the word_indices vector for this text might look
% Then, the word_indices vector for this text might look
% like:
%
%
% 60 100 33 44 10 53 60 58 5
%
% where, we have mapped each word onto a number, for example:
@ -48,14 +48,11 @@ x = zeros(n, 1);
%
%
for j = 1:length(word_indices)
x(word_indices(j)) = 1;
end
% =========================================================================
end