how to extract matrix based on a condition?

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MAHMOUD ALZIOUD 2017-11-2

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评论： MAHMOUD ALZIOUD 2017-11-3

Hello Everyone, if I have a matrix for example 100 rows by 38 columns, column number 14 has distances, how can i build a for loop with a condition saying: if the distance is between 8 and 12 ft then take the rows corresponding to this condition to construct a new matrix, and put zeros instead of them in the main matrix. i need to do this because i need to stay away from duplicate data when i run another condition. HELP PLEASE

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Answer 1

KSSV 2017-11-3

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You need not to use a loop, you can use the below lines of code to get what you want.

A = randi(100,38) ;   % some random data 
distance = A(:,14) ;
%%apply condition to get rows indices satifying the condition
idx = find(distance > 8 & distance < 12)