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plot of differernt regions in a matrix

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Hassan
Hassan on 21 Jun 2011
I have 2 matrixes with the same dimension(100,200). the structure of one the matrixes is something like as follows: class1{row=1:3 and j=4:7>>value=2} class2{row=1:3 and j=8:8>>value=3} class3{row=10:12 and j=150:160>>value=2} class4{row=80:90 and j=150:160>>value=3}
I want to make a plot of pixels in matrix2 which have a value 2 in matrix1 but show them as differnt classes. class 1 has 12 values and class 3 has 33 values. i want a plot which on X axis from 1 to 12 is shown as class 1 and from 13 to 13+33 as class3. I'm not sure if I asked my question clearly, but please let me know if it's not clear. I appereciate your help.

Accepted Answer

Andrei Bobrov
Andrei Bobrov on 21 Jun 2011
m1 = rand(100,200);
m2 = zeros(size(m1));
m2(1:3,4:7)=2;
m2(10:12,150:160)=2;
m2(1:3,8)=3;
m2(80:90,150:160)=3;
L = bwlabel(m2 == 2);
[r c v] = find(L);
wmtx = sortrows([r c v],3);
plot(1:size(wmtx,1),m1(sub2ind(size(m1),wmtx(:,1),wmtx(:,2))));
ADD on comment
pm1 = m1(sub2ind(size(m1),wmtx(:,1),wmtx(:,2)));
dplt = mat2cell([(1:size(wmtx,1))' pm1],...
arrayfun(@(i1)nnz(wmtx(:,3)==i1),1:max(wmtx(:,3))) ,ones(1,2));
plot(dplt{1,:},'r*-',dplt{2,:},'go-')
corrected 'plot(...'
n = size(wmtx,1);
k=reshape('ymcrgbwk+o*.xv^>--------',[],3);
dplt2 = [dplt mat2cell([repmat(k,fix(n/8),1);k(1:rem(n,8),:)],ones(n,1),3)]';
plot(dplt2{:})
COD of last correcting
L = bwlabel(m2 == 2);
[r c v] = find(L);
wmtx = sortrows([r c v],3);
pm1 = m1(sub2ind(size(m1),wmtx(:,1),wmtx(:,2)));
dplt = mat2cell([(1:size(wmtx,1))' pm1],...
arrayfun(@(i1)nnz(wmtx(:,3)==i1),1:max(wmtx(:,3))) ,ones(1,2));
n = size(dplt,1);
k=reshape('ymcrgbwk+o*.xv^>--------',[],3);
dplt2 = [dplt mat2cell([repmat(k,fix(n/8),1);k(1:rem(n,8),:)],ones(n,1),3)]';
plot(dplt2{:})
  10 Comments
Hassan
Hassan on 23 Jun 2011
thanks a lot Andrei.

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