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Extract data from columm

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Quynh tran
Quynh tran el 9 de Jun. de 2017
Comentada: Quynh tran el 9 de Jun. de 2017
Dear all,
Could you help me? I have this matrix:
A= [1 3 0
2 0 0
3 0 0
4 3 0
5 0 0
6 0 0
7 0 0
8 0 0
9 0 0
10 3 0
11 0 0
12 0 0
13 5 0
14 0 0
15 0 0
16 0 0
17 6 0
18 0 0
19 0 0
20 0 0
21 3 0
22 0 0
23 0 0
24 6 0
25 0 0
26 0 0
27 0 0
28 0 0
29 0 0
30 0 0
31 0 0
32 0 0.02256
33 0 0.018682
34 4 0.011892
35 0 0.022345
36 3 0.018794
37 0 0.021655
38 0 0.015674
39 0 0.023075
40 0 0.01055
41 0 0.013921
42 3 0.017497
43 0 0.023766
44 0 0.005467
45 0 0.011991
46 0 0.020437
47 0 0.022869
48 0 0.014035
49 0 0.023253
50 0 0.019731
51 0 0.019275
52 0 0.012172
53 0 0.010395
54 0 0.01569
55 0 0.014506
56 0 0.011423]
I want to extract a submatrix which have number 0 in the columm 3. The result will be
B=[1 3 0
2 0 0
3 0 0
4 3 0
5 0 0
6 0 0
7 0 0
8 0 0
9 0 0
10 3 0
11 0 0
12 0 0
13 5 0
14 0 0
15 0 0
16 0 0
17 6 0
18 0 0
19 0 0
20 0 0
21 3 0
22 0 0
23 0 0
24 6 0
25 0 0
26 0 0
27 0 0
28 0 0
29 0 0
30 0 0
31 0 0]
and another submatrix which have all range with number 3 in the second columm. The results will be:
C= [1 3 0
4 3 0
10 3 0
21 3 0
36 3 0.018794
42 3 0.017497].
Thanks.

Respuesta aceptada

KSSV
KSSV el 9 de Jun. de 2017
Editada: KSSV el 9 de Jun. de 2017
A is your matrix:
%%Number 0 in col3
B = A(A(:,3)==0,:) ;
%%Number 3 in col2
C = A(A(:,2)==3,:) ;

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