Can anybody help me with what this kind of thing means In MatLab

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Zach White
Zach White 2013-3-25
I am studying some tagging with Blue crabs and I need to make sure I am on the right track with interpreting the data. Would anyone be able to tell me in simpler terms what the data below is trying to find?
idx_r1_A1 = find ( ant_num_r1 == 1 );
idx_r1_A2 = find ( ant_num_r1 == 2 );
idx_r2_A1 = find ( ant_num_r2 == 1 );
idx_r2_A2 = find ( ant_num_r2 == 2 );
idx_r3_A1 = find ( ant_num_r3 == 1 );
idx_r3_A2 = find ( ant_num_r3 == 2 );
idx_r4_A1 = find ( ant_num_r4 == 1 );
idx_r4_A2 = find ( ant_num_r4 == 2 );

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回答（2 个）

Walter Roberson
Walter Roberson 2013-3-25
find() returns the index locations at which the condition was true. So the first find() is returning the indices in ant_num_r1 that were equal to 1.
Matt Kindig
Matt Kindig 2013-3-25
Each of the idx_rX... variables are the output of find, and are indicating the indices of where the expression inside the parentheses is true. To be clear:
- The expression
ant_num_r1 == 1
creates a logical matrix, the same size as ant_num_r1, where 1 (true) occurs everytime ant_num_r1 is equal to 1, and is 0 (false) otherwise.
- The find() function determines the index positions in ant_num_r1 where that expression is true (i.e. ant_num_r1 is equal to 1).
The ant_num_r1==2 is doing the same for when ant_num_r1 is equal to 2, and vice versa. Does this answer your question?

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