CODEWITHSUNDEEP
matlabmatrix
gabboshow
gabboshow

Reputation: 5579

find word occurrences in matrix matlab

I have a big matrix which cells represent the number of occurrences of a word (row) in a text document (column).

counts = rand(567840,799); % 567840 words,799 text documents

Without executing a loop I need to:

1) extract the indeces of the words that occurr in at least the 90% of the text documents

2) extract the indeces of the words that occour max 2 times in all the collection of documents.

for the point 2 I would do

idx_2 = find(sum(counts,2)<=2);

I am struggling with point 1... Can you help me?

Upvotes: 0

Views: 179

Answers (1)

Chris Taylor
Chris Taylor

Reputation: 47402

For 1 you can do

idx1 = find(mean(counts > 0, 2) >= 0.9);

and for 2 as you said

idx2 = find(sum(counts, 2) <= 2);

Edit - I see Luis Mendo already mentioned this in the comments so I have marked this community wiki.

Upvotes: 1

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