"find" is not finding what I want it to?

1 view (last 30 days)
I have a data set of 8341 numbers and I want to create two vector of the numbers between 3 and 200, and another of the numbers outside of that range. AI is the area included (between 3 and 200), and AE is the area excluded (below 3 or above 200) but when I run them they keep giving me the same amount (8341). Any idea what's going on?
I'm trying to plot the area included as a yellow ellipse, and the area excluded as a green ellipse.
s = regionprops(BW, 'Area','Orientation', 'MajorAxisLength', ...
'MinorAxisLength','Area', 'Eccentricity', 'Centroid');
hold on
phi = linspace(0,2*pi,50);
cosphi = cos(phi);
sinphi = sin(phi);
areas=[s.Area]
AI=find(3<areas<200);
AE=find(3.0>areas<200);
for k = AI
xbar = s(k).Centroid(1);
ybar = s(k).Centroid(2);
a = s(k).MajorAxisLength/2;
b = s(k).MinorAxisLength/2;
theta = pi*s(k).Orientation/180;
R = [ cos(theta) sin(theta)
-sin(theta) cos(theta)];
xy = [a*cosphi; b*sinphi];
xy = R*xy;
x = xy(1,:) + xbar;
y = xy(2,:) + ybar;
plot(x,y,'y','LineWidth',2);
hold on;
end
hold on
for k = AE
xbar = s(k).Centroid(1);
ybar = s(k).Centroid(2);
a = s(k).MajorAxisLength/2;
b = s(k).MinorAxisLength/2;
theta = pi*s(k).Orientation/180;
R = [ cos(theta) sin(theta)
-sin(theta) cos(theta)];
xy = [a*cosphi; b*sinphi];
xy = R*xy;
x = xy(1,:) + xbar;
y = xy(2,:) + ybar;
plot(x,y,'g','LineWidth',2);
hold on;
end

Accepted Answer

Image Analyst
Image Analyst on 12 Nov 2021
Try this:
logicalIndexes = areas > 3.0 & areas < 200;
AI=find(logicalIndexes); % Indexes within the area range.
AE= find(~logicalIndexes); % Indexes outside the area range.

More Answers (1)

Chunru
Chunru on 12 Nov 2021
Edited: Chunru on 12 Nov 2021
Try the following:
AI=find(3.0<areas & areas<200);
% AE=find(3.0>areas & areas<200);
AE=find(3.0>areas | areas<200);
  4 Comments
Image Analyst
Image Analyst on 12 Nov 2021
@Kristin Aldridge, yes I did. Perhaps you overlooked it below. Maybe you could "Accept" it, or at least "Vote" for it.

Sign in to comment.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by