根据条件选择矩阵子集 [英] selecting subset of matrix based on condition

问题描述

我有以下矩阵

test = [1 2 3 4;
        2 3 4 5;
        3 4 5 6;
        4 5 6 7;
        5 6 7 8];

我想选择行，其第一个条目的值在1到3之间.我尝试过

I would like to select the rows whose first entry has a value between 1 and 3. I tried with

test(test(:,1)<3 && test(:,1)>1)

但是那给了我一个错误.然后我尝试了

but that gave me an error. Then I tried with

test(1<test(:,1)<3)

但这不能给我想要的结果2 3 4 5.有没有办法得到这个Matlab?

but that doesn't give me the desired result 2 3 4 5. Is there a way to obtain this is Matlab?

推荐答案

尝试一下，我无法在Matlab中对其进行测试，但应该可以.

Try this, I couldn't test it in Matlab but it should work.

test((1 < test(:,1) && test(:,1) < 3),:)

说明:

这 (1< test(:，1)&& test(:，1)< 3) 获取具有符合条件的行的二进制数组，然后使用它选择行.

This (1 < test(:,1) && test(:,1) < 3) Get's a binary array with the rows that fit the criteria, then you use that to select the rows.

有关更多信息，请参见此处.

See here for more information.

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