I can I do logical indexing on a column

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Engdaw Chane
Engdaw Chane 2018-7-20
评论： Engdaw Chane 2018-7-20
Hello everyone,
I have a column which is 840 in length. It contains value s from -12 to 12. I need only values < -8 and >8. I need to keep the length 840. I tried the following. but it says " 0x1 empty double column vector".
v = zeros (size (data)); % Pre-allocate!
v=data(data <-8 & data>8)
thank you for helping.
Chane

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Birdman
Birdman 2018-7-20
编辑：Birdman 2018-7-20
Is it possible for a value to be smaller than -8 and greater than 8 at the same time? Check your logical operator. You need OR operator instead of AND.
v=data(data <-8 | data>8)
You can not keep the length same. If you want that, fill the other values with a specific value, like zero.
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Guillaume
Guillaume 2018-7-20
编辑：Guillaume 2018-7-20
Well, if you want to replace values less than absolute 8 by 0, then:
v(abs(v) < 8) = 0;
You may want <= instead of <

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