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Find brings back empty matrix

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benny
benny 2014-11-20
编辑： Azzi Abdelmalek 2014-11-20
When I use the find command the get back empty matrix: 0-by-1 for B and L,but I get an answer for R. help please thanks
This is my code
clear,clc
load rocket.dat
B= rocket(:,4);
R= rocket(:,2);
L= rocket(:,3);
(find(L<40 & L>60))
(find(B<100 & B>200))
(find(R<115 & R<125))
This is the data in rocket.dat for reference
1.0000000e+000 1.1600000e+002 4.5000000e+001 1.1000000e+002
2.0000000e+000 1.1400000e+002 4.2000000e+001 1.1500000e+002
3.0000000e+000 1.1800000e+002 4.1000000e+001 1.2000000e+002
4.0000000e+000 1.2400000e+002 3.8000000e+001 9.5000000e+001
5.0000000e+000 1.2600000e+002 6.1000000e+001 1.1800000e+002

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采纳的回答

Ahmet Cecen
Ahmet Cecen 2014-11-20
That is because a number cant be bigger than 60 and lower than 40 at the same time:
L<40 & L>60
You need to figure out what range you are actually interested in, and either flip those inequalities or use OR instead of AND.

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