help with graphics/colormap/pcolor or whatever
in [Matlab]
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From: tracy on 25 Jul 2010 17:21 Hello, I have a question that I am hoping someone here can help me with. I have a 82*100 matrix and for each row, I want to specify a certain range of values (3 different ranges) a specific color AND these ranges change for each row. For example, say anything in (1,:) is between -400: -100 I want it to be blue, and anything between -100: 500 to be black, and anything between 500: 800 I want to be red. Then for (2,:), I have a different group of rangers to be those three colors. Does anyone have any idea how to do this? Thanks so much in advance, Tracy
From: us on 25 Jul 2010 17:35 "tracy " <tracyaromano(a)gmail.com> wrote in message <i2i9o7$qps$1(a)fred.mathworks.com>... > Hello, > > I have a question that I am hoping someone here can help me with. I have a 82*100 matrix and for each row, I want to specify a certain range of values (3 different ranges) a specific color AND these ranges change for each row. For example, say anything in (1,:) is between -400: -100 I want it to be blue, and anything between -100: 500 to be black, and anything between 500: 800 I want to be red. Then for (2,:), I have a different group of rangers to be those three colors. Does anyone have any idea how to do this? > > > Thanks so much in advance, > > Tracy a hint: - re-index -or- enumerate your matrix according to the unique colors you want... - create a color map matching these indices/numbers... us
From: Jan Simon on 25 Jul 2010 18:17 Hi Tracy, Range = [ ... 0.1, 0.3, 0.5; ... 0.2, 0.7, 0.6]; % Limits for the columns Xseparated = repmat(2, size(X)); Xseparated(bsxfun(@lt, X, Range(1, :))) = 1; % Or "le" ? Xseparated(bsxfun(@gt, X, Range(2, :))) = 3; % Or "ge" ? Good luck, Jan
From: us on 25 Jul 2010 18:50 "Jan Simon" <matlab.THIS_YEAR(a)nMINUSsimon.de> wrote in message <i2id51$s14$1(a)fred.mathworks.com>... > Hi Tracy, > > Range = [ ... > 0.1, 0.3, 0.5; ... > 0.2, 0.7, 0.6]; % Limits for the columns > Xseparated = repmat(2, size(X)); > Xseparated(bsxfun(@lt, X, Range(1, :))) = 1; % Or "le" ? > Xseparated(bsxfun(@gt, X, Range(2, :))) = 3; % Or "ge" ? > > Good luck, Jan one of the other solutions % the data m=[ 1 300 100 2 310 101 10 20 200 11 11 300 20 10 500 21 111 501 25 110 501 ]; mr={ % <- ranges for each COL... [0,10,50] % <- COL# 1 [0,50,200,400] [0,150,400,600] }; % the engine clear ix; nc=size(m,2); % - enumerate M with unique indices... [ix,ix]=arrayfun(@(x) histc(m(:,x),mr{x}),1:nc,'uni',false); %#ok ix=cat(2,ix{:}); is=[0,cumsum(max(ix(:,1:nc-1)))]; mix=bsxfun(@plus,ix,is); % - create colormap, eg, simply cn=max(mix(:)); cmap=hsv(cn); cmap(3,:)=[0,0,0]; % <- color for index #3... cmap(7,:)=.5*[1,1,1]; % <- ... #7... % the result imagesc(mix); colormap(cmap); colorbar; axis image; us
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