Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
Drexel University or The Math Forum.
|
|
|
|
Re: Storing the value of a variable
Posted:
Feb 10, 2013 3:30 AM
|
|
On 2/9/2013 9:22 PM, Subash Padmanaban wrote:
> a=mmreader('abcd.avi');
> for k= 55 : 65
> frame=read(a,k);
> level= graythresh(frame);
> fig=im2bw(frame,level);
> imshow(fig);
> numberofpoints=1;
> [x y]=ginput(numberofpoints);
> plot(x,y);
> end
>
> My problem is that, I want to store the values of x and y in an
> array and later plot it. How do I go about with this? Also, every
> time the number of frames will not be the same.
>
You know the total size of x and y needed? It is the
length of each loop * numberofpoints. Hence you
can preallocate a matrix to store then in.
--------------------------
close all;
N = 3;
numberofpoints = 4;
data = zeros(numberofpoints,2,N); %store all points
for i=1:N
[data(:,1,i) data(:,2,i)] = ginput(numberofpoints);
end
%get the points out and plot them
X = permute(data,[1 3 2]);
X = reshape(X,[],size(data,2),1)
plot(X(:,1),X(:,2),'ro')
--------------------------
--Nasser
|
|
|
|
