image - Sparse matrix plot matlab -


i have 5000 *5000 sparse matrix 4 different values. want visualise nonzero elements 4 different colors such can recognise ratio of values , relationships between them,i use imagesc can not recognise among different values, values smaller ratio.i think if use symboles each value , works don't know how in matlab. suggestion? result of dan code in figure below.

results of 5000*5000result of 1000*1000 block of 5000*5000 matrix

you reform matrix set of [x, y, f] coordinates (re-using answer resampling matrix , restoring in 1 single matrix):

assuming matrix m

[x, y] = meshgrid(1:size(m,1), 1:size(m,2)); mf = m(:); %used again later, hence stored v = [x(:), y(:), mf];

get rid of 0 elements

v(mf == 0, :) = [];

at point, if have access statistics toolbox can go gscatter(v(:,1), v(:,2), v(:,3)) correct plot otherwise continue following if don't have toolbox:

find list of unique values in m 

vu = unique(v(:,3));

for each such value, plot points xy scatter plot, note hold makes sure colour changes each time new plot added i.e. each new iteration of loop

hold all; g = 1:length(vu)     vg = v(v(:,3)==vu(g),:)     plot(vg(:,1), vg(:,2), '*');     a{g}=num2str(vu(g)); end legend(a);

example m:

m = zeros(1000); m(200,30) = 7; m(100, 900) = 10; m(150, 901) = 13; m(600, 600) = 13;

result:

enter image description here


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