how to select rows of a matrix on the basis of occurrence of elements in matlab? -

i have [sentence cross words] matrix follows.

x = [ 0 1 1 0 1       1 1 1 0 0       0 0 1 1 0       1 1 0 1 1       0 0 0 0 0 ]; 

0 shows word present in respective sentence , 1 shows word absent in respective sentence, have done processing , selected word number 2,3 , 5 columns. want select sentences (rows) on basis of word 2,3 , 5 in 2 or more 2 words appear, single appearance of word in sentence should not considered

for example above matrix sentence number 1, 2 , 4 should selected because word 2,3 , 5 occurs in them , sentence number 3 , 5 should not considered because in sentence 3 word 3 appears alone without 2 , 5. if there 2 or 5 present in sentence 3 should selected because more 2 words occured in senence.

one approach select valid rows x -

x_valid = x(sum(x(:,[2 3 5]),2)>=2,:) 

instead, if interested in knowing valid indices -

idx = find(sum(x(:,[2 3 5]),2)>=2) 

sample run -

x =      0     1     1     0     1      1     1     1     0     0      0     0     1     1     0      1     1     0     1     1      0     0     0     0     0 x_valid =      0     1     1     0     1      1     1     1     0     0      1     1     0     1     1 idx =      1      2      4