how could I use the "find" command to compare two matrices?

Hello Matlabers,

I have 2 matrices (with 1 column and 2000 rows each) and I would like to compare each row from each matrix and get a 3rd logical matrix with 1's or 0's depending on the case... so far I tried to use the command:

control_matrix=find(A)<(B);

and this is supposed to generate a control matrix with 1's and 0's with the same size (1 column and 2000 rows) but when I apply the command it does not give me back the correct results...

any idea, suggestion or hint?

thanks! :)

Answer 1

[Laura Proctor]

Comparing two matrices directly will give back a logical array:

control_matrix= A<B;

The find function will find the index values where items are nonzero.

[Elsis]

thanks but this is not what I want to do... doing this returns a matrix with a different size... yes, it solves the logic but not gives a matrix with the proper size (2000 rows) it only tells me the index values and in my case this is a matrix with only 895 rows... what I want is a logical matrix with 1's and 0's depending if the condition is fulfilled o not (per row) with the size of 1 column and 2000 rows...

any other idea???

[Laura Proctor]

Did you try this command? It doesn't use find. If A & B are both 1x2000 element arrays, then it will return a 1x2000 element logical array containing 1's and 0's. The use of find returns the index values. Try it!

[Image Analyst]

Obviously Elsis, you did NOT try the code she provided. I think you just ran your original code instead.