Selecting specific values from an array based on a defined condition

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.

Answer 1

[Fabio Freschi]

d+m is not scalar: use a single & for logical AND

d(d+m >= 0 & d+m <= 300)

[SB]

Thank you!

Answer 2

[Johannes Fischer]

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);

[SB]

I actually tried that. It gives me the following error:

Operands to the || and && operators must be convertible to logical scalar values.

[Johannes Fischer]

You are right, only one '&' is necessary

d(0 <= m+d & m+d <= 300);

[SB]

Thank you.