Save two variables generated within a for loop
1 view (last 30 days)
Show older comments
Hi. I am trying to save the two variables (x_out and y_out) present in the for loop (see inside the function 'example.m', line 34 and 35).
How can I do this?
Attached you will find the .txt files to use the function.
X = importdata('X.txt');
IDX = importdata('IDX.txt');
example(X, IDX);
0 Comments
Accepted Answer
Zahrah Walid
on 3 Dec 2022
Variables generated inside a function are locl variables inside the function only.
you can return the wanted variables from your function as follows:
function [x_out, y_out]=example(X, IDX)
%your function body as you provide
end
and when calling the function from the main program, you just put x_out and y_out values in your wanted variable in main program, i.e.:
X = importdata('X.txt');
IDX = importdata('IDX.txt');
[x,y] = example(X, IDX); %your x_out value is assigned into x variable and y_out value is assigned into y variable.
3 Comments
Zahrah Walid
on 3 Dec 2022
You just have to define px and py as follows in the function:
px(i+1,k) = x_out;
py(i+1,k) = y_out;
It's preferred to setup the second figure by the same settings of the first one to avoid pseudo differences.
figure()
plot(px,py,'*k'); % I want to get the second figure but with all the * blacks (as in the first plotted figure)
axis equal; %to be the same ratio
xlim([70 430])
ylim([150 300])
and this is the whole code, I have tried it after modification and I think it works as you want:
X = importdata('X.txt');
IDX = importdata('IDX.txt');
%example(X, IDX);
[px, py] = example(X, IDX);
figure()
plot(px,py,'*k'); % I want to get the second figure but with all the * blacks (as in the first plotted figure)
axis equal;
xlim([70 430])
ylim([150 300])
function [px, py] = example(X, IDX)
k=max(IDX);
Colors=hsv(k);
Legends = {};
n = 1;
for i=0:k
Xi=X(IDX==i,:);
if i~=0
Style = 'x';
MarkerSize = 8;
Color = Colors(i,:);
% Legends{2*n-1} = ['Cluster #' num2str(i)];
% Legends{2*n} = ['Boundary # ' num2str(i)];
n = n+1;
else
Style = 'o';
MarkerSize = 6;
Color = [0 0 0];
if ~isempty(Xi)
Legends{end+1} = 'Noise';
end
end
if ~isempty(Xi)
x_temp = Xi(:,1);
y_temp = Xi(:,2);
s = 1;
k = boundary(x_temp,y_temp,s);
x_out = x_temp(k);
y_out = y_temp(k);
px(i+1,k) = x_out;
py(i+1,k) = y_out;
plot(x_temp,y_temp,Style,'MarkerSize',MarkerSize,'Color',Color);
hold on
plot(x_out,y_out,'*k');
hold on
end
hold on;
end
hold off;
axis equal;
grid on;
legend(Legends);
legend('Location', 'NorthEastOutside');
xlim([70 430])
ylim([150 300])
end
figure 1
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1217722/image.png)
figure 2
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1217727/image.png)
Is this what you want?
More Answers (0)
See Also
Categories
Find more on Title in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!