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How to use logical expressions to change the values of a column who matches a condition on a different column?

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Philippe Corner
Philippe Corner 2018-2-13
评论： Philippe Corner 2018-3-23
If we have a matrix M like
V1. V2. V3.
1 1 1
2 4 9
3 4 0
4 4 3
5 5 1
6 9 5
7 0 3
8 4 5
9 4 6
10 5 2
How could we make zero the values of V2 and V3 which are from 4 to 7? obtaining M2 like:
V1. V2. V3.
1 1 1
2 4 9
3 4 0
4 0 0
5 0 0
6 0 0
7 0 0
8 4 5
9 4 6
10 5 2

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采纳的回答

Birdman
Birdman 2018-2-13
编辑：Birdman 2018-2-13
M=[1 1 1
2 4 9
3 4 0
4 4 3
5 5 1
6 9 5
7 0 3
8 4 5
9 4 6
10 5 2];
M(4:7,2:3)=0

更多回答（1 个）

Andrei Bobrov
Andrei Bobrov 2018-2-13
>> V = [1 1
4 9
4 0
4 3
5 1
9 5
0 3
4 5
4 6
5 2];
>> V(4:7,:)=0
V =
1 1
4 9
4 0
0 0
0 0
0 0
0 0
4 5
4 6
5 2
>>

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