Selecting specific values from an array based on a defined condition

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SB
SB 2019 年 9 月 25 日
コメント済み: SB 2019 年 9 月 25 日
I have the following array:
d = [0,100,-100];
m = 300;
I want to select certain values of array d as follows:
d(0<=m+d<=300);
So i want to select all the d values where m+d is beween 0 and 300 with both ends included. The result should look like [0,-100] and 100 should be excluded since it is out the defined range. However, I am getting d to be [0,100,-100]. Please let me know where I went wrong.

採用された回答

Fabio Freschi
Fabio Freschi 2019 年 9 月 25 日
編集済み: Fabio Freschi 2019 年 9 月 25 日
d+m is not scalar: use a single & for logical AND
d(d+m >= 0 & d+m <= 300)

その他の回答 (1 件)

Johannes Fischer
Johannes Fischer 2019 年 9 月 25 日
編集済み: Johannes Fischer 2019 年 9 月 25 日
Th logical expression
0 <= m+d <= 300
is not interpreted by Matlab as you think it is. It rather is interpreted as
(0 <= m+d) <= 300
where the expression in brackets results in logical 0 and 1 values which all are below 300, which in turn results in logical 1 at each position. What you want is a combination of both cases
d(0 <= m+d && m+d <= 300);
  3 件のコメント
Johannes Fischer
Johannes Fischer 2019 年 9 月 25 日
You are right, only one '&' is necessary
d(0 <= m+d & m+d <= 300);
SB
SB 2019 年 9 月 25 日
Thank you.

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