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Octave 2/5• Use the Octave shell pretty much like a Bash shell– Arrow : previous command– Arrow : next command–CTRL+R: search in history–CTRL+A: go to beginning of line–CTRL+E: go to end of line–CTRL+K: delete from cursor position to end of line20
Octave 3/5• Here are some commands useful for ES#8– Create a vector or matrixA = [1 1 1 0 0; 0 0 1 2 0; 1 0 0 1 1]; // 3 x 5 matrix.– Compute part of SVD pertaining to k top singular values21[U, S, V] = svd(A);[U, S, V] = svds(A, k);– Get a portion of a matrix or vectorUU = U(:, 1:k); // First k columns of U.– Multiply a matrix with its transposeT = UU * UU';// For dense matrices, k = rank(A)// For sparse matrices, must spec. k– Note: if you omit the semicolon or write a comma, the resultwill be printed on the screen
Page 1 and 2: Information RetrievalWS 2012 / 2013
Page 3 and 4: Experiences with ES#7 (cookies, UTF
Page 5 and 6: Synonyms 1/4• Problem: another so
Page 7 and 8: Synonyms 3/4• Solution 2: Track u
Page 9 and 10: Latent Semantic Indexing 1/9• An
Page 11 and 12: Latent Semantic Indexing 3/9• If
Page 13: Latent Semantic Indexing 5/9• Eig
Page 17: Latent Semantic Indexing 8/9• Wit
Page 22 and 23: Octave 4/5• Sparse matrices- Our
Page 24: References• Further reading- Text

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