Select positive values around a certain value

Hi there,

I want to select a specific string in an array containing positive and negative values.

For example:

A = [-2 1 0.5 -34 4 5 9 3 1 -3 -2 6 -7]

B = 3

I want to select the positive points surrounding A(8) = 3.

So A(5:9).

Best regards and thank you in advance!

Answer 1

[Rik]

If you happen to have the image processing toolbox:

A = [-2 1 0.5 -34 4 5 9 3 1 -3 -2 6 -7];
B = 3;
labeled=bwlabel(A>0);
L=labeled==labeled(A==B);
ind=find(L);

If not, there are several alternative methods you could try.

[Sven Stuiver]

Works perfectly! Thanks a lot