define color range in scatter plot

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Turbulence Analysis 2022-6-29

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评论： Turbulence Analysis 2022-7-1

Hi,

I have values ranging from 0 to 3000. Here, only for the values ranging between 2000 to 3000 I have to use the color palette, for rest of the values (i.e. 0 to 1000) the color should be in black..

And I am using scatter plot here.. Is it possible to define above conditions in the scatter plot..

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Jonas 2022-6-29

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编辑：Jonas 2022-6-29

在 MATLAB Online 中打开

i do not fully understand, you want to use the pallett for split to 0 to 3000, but at a certain threshold you want to use black instead?

what about values between 1000 and 2000?

x = linspace(0,3*pi,2000);

y = cos(x) + rand(1,2000);

c = linspace(1,10,length(x));

sp=scatter(x,y,[],c);

currMap=colormap();

[~,highestCDataIdx]=max(sp.CData(sp.XData<=3));

highestCDataIdx=ceil(highestCDataIdx*size(currMap,1)/numel(sp.XData)); % scale CData Index by ration of colormap elements to number of XData to map

currMap(1:highestCDataIdx,:)=0;

colormap(currMap)

you can also change values inbetween without changing the pallett

x = linspace(0,3*pi,2000);

y = cos(x) + rand(1,2000);

c = linspace(1,10,length(x));

sp=scatter(x,y,[],c);

currMap=colormap();

[~,highestCDataIdx]=max(sp.CData(sp.XData<=3));

highestCDataIdx=ceil(highestCDataIdx*size(currMap,1)/numel(sp.XData)); % scale CData Index by ration of colormap elements to number of XData to map

currMap(1:highestCDataIdx,:)=0;

colormap(currMap);

delInbetween=sp.XData<5 & sp.XData>4;

sp.XData(delInbetween)=[];

sp.YData(delInbetween)=[];

sp.CData(delInbetween)=[];

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Jonas 2022-7-1

在 MATLAB Online 中打开

matlab.mat

so some things to make the points in your cloud better distinctable: you can change the marker and the marker size and the coarseness of you colormap:

load('matlab.mat','x','y')

scatter(x,y,[],linspace(0,1,numel(x)),'.','SizeData',1)

colorbar;

cm=colormap('colorcube');

cm=cm(1:8:end,:);

colormap(cm)