plot based on a value

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MattC 2023-3-9

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1925870-plot-based-on-a-value

评论： MattC 2023-3-22

采纳的回答： Voss

在 MATLAB Online 中打开

Hi, I would like to plot a scatter plot for 3 variables in a single plot

A = 0.5; B = 0.2; C = 1.2;
scatter('X1',A,'*'); %if a<=1 then blue color else orange
scatter('X1',B,'s'); %if b<=1 then blue color else orange
scatter('X1',C,'+'); %if c<=1 then blue color else orange
yl = yline(1, '--r', 'LineWidth',1);

I want to add a legend as well which would show these values. How to achieve this?

采纳的回答

Voss 2023-3-9

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1925870-plot-based-on-a-value#answer_1189535

编辑：Voss 2023-3-9

在 MATLAB Online 中打开

% random vectors (10x1) of values between 0 and 2

AA = 2*rand(10,1);

BB = 2*rand(10,1);

CC = 2*rand(10,1);

DD = 2*rand(10,1);

EE = 2*rand(10,1);

limit = 1;

X = 1:10;

figure()

hold on

obj = [];

% use logical indexing to separate AA<=1 (blue) from AA>1 (orange)

idx = AA<=1;

obj(end+1) = scatter(X(idx),AA(idx),[],'b','*');

scatter(X(~idx),AA(~idx),[],[1 0.5 0],'*');

% use logical indexing to separate BB<=1 (blue) from BB>1 (orange)

idx = BB<=1;

obj(end+1) = scatter(X(idx),BB(idx),[],'b','s');

scatter(X(~idx),BB(~idx),[],[1 0.5 0],'s');

% use logical indexing to separate CC<=1 (blue) from CC>1 (orange)

idx = CC<=1;

obj(end+1) = scatter(X(idx),CC(idx),[],'b','+');

scatter(X(~idx),CC(~idx),[],[1 0.5 0],'+');

names = {'A','B','C'};

ylims = ylim();

ylims(1) = min(-1,ylims(1));

ylim(ylims);

idx = DD < EE;

if any(idx)

obj(end+1) = plot(X(idx),-1*ones(1,nnz(idx)),'s', ...

'MarkerFaceColor',[0.5 0.5 0.5],'MarkerEdgeColor','none');

names{end+1} = 'D<E';

end

if any(~idx)

idx2 = any([AA BB CC] > limit, 2);

if any(~idx & idx2)

obj(end+1) = plot(X(~idx & idx2),-1*ones(1,nnz(~idx & idx2)),'s', ...

'MarkerFaceColor','r','MarkerEdgeColor','none');

names{end+1} = 'A,B,C>1';

end

if any(~idx & ~idx2)

obj(end+1) = plot(X(~idx & ~idx2),-1*ones(1,nnz(~idx & ~idx2)),'s', ...

'MarkerFaceColor','g','MarkerEdgeColor','none');

names{end+1} = 'A,B,C<=1';

end

yl = yline(limit, '--r', 'LineWidth',1);

names{end+1} = 'limit';

legend([obj yl],names)

A = 0.5; B = 0.2; C = 1.2;

title(sprintf('Plot: A=%g, B=%g, C=%g',A,B,C))

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Voss 2023-3-15

在 MATLAB Online 中打开

Something like this?

% random vectors (10x1) of values between 0 and 2

AA = 2*rand(10,1);

BB = 2*rand(10,1);

CC = 2*rand(10,1);

DD = 2*rand(10,1);

EE = 2*rand(10,1);

limit = 1;

X = 1:10;

figure()

hold on

obj = [];

names = {};

color1 = [0.5 0.5 0.5];

color2 = [1 0.5 1];

idx = DD < EE;

if any(idx)

obj(end+1) = plot(X(idx),AA(idx),'*', ...

'MarkerFaceColor',color1,'MarkerEdgeColor',color1);

obj(end+1) = plot(X(idx),BB(idx),'s', ...

'MarkerFaceColor',color1,'MarkerEdgeColor',color1);

obj(end+1) = plot(X(idx),CC(idx),'+', ...

'MarkerFaceColor',color1,'MarkerEdgeColor',color1);

names(end+[1 2 3]) = {'A (D<E)','B (D<E)','C (D<E)'};

end

if any(~idx)

obj(end+1) = plot(X(~idx),AA(~idx),'*', ...

'MarkerFaceColor',color2,'MarkerEdgeColor',color2);

obj(end+1) = plot(X(~idx),BB(~idx),'s', ...

'MarkerFaceColor',color2,'MarkerEdgeColor',color2);

obj(end+1) = plot(X(~idx),CC(~idx),'+', ...

'MarkerFaceColor',color2,'MarkerEdgeColor',color2);

names(end+[1 2 3]) = {'A (D>=E)','B (D>=E)','C (D>=E)'};

end

obj(end+1) = yline(limit, '--r', 'LineWidth',1);

names{end+1} = 'limit';

ylims = ylim();

ylims(1) = min(0,ylims(1));

ylim(ylims);

legend(obj,names)

MattC 2023-3-15

在 MATLAB Online 中打开

Sorry, for the confusion, here is what I mean:

Same conditions:

If column D < column E then mark all points A,B,C in grey
If column D >= column E then make additional check if any of A,B,C pointer above 1(limit), then mark all A,B,C as red
If column D >= column E then make additional check if any of A,B,C pointer not above 1(limit), then mark A,B,C as green

I think the logic to check conditions still remains same but just that instead of adding the color on y=-1 I am now trying to change the color for A,B,C itself and all of them to be red,green,grey based on the check

idx = DD < EE;
if any(idx)
    obj(end+1) = plot(X(idx),-1*ones(1,nnz(idx)),'s', ...
        'MarkerFaceColor',[0.5 0.5 0.5],'MarkerEdgeColor','none');
    names{end+1} = 'D<E';
end
if any(~idx)
    idx2 = any([AA BB CC] > limit, 2);
    if any(~idx & idx2)
        obj(end+1) = plot(X(~idx & idx2),-1*ones(1,nnz(~idx & idx2)),'s', ...
            'MarkerFaceColor','r','MarkerEdgeColor','none');
        names{end+1} = 'A,B,C>1';
    end
    if any(~idx & ~idx2)
        obj(end+1) = plot(X(~idx & ~idx2),-1*ones(1,nnz(~idx & ~idx2)),'s', ...
            'MarkerFaceColor','g','MarkerEdgeColor','none');
        names{end+1} = 'A,B,C<=1';
    end
end
yl = yline(limit, '--r', 'LineWidth',1);
names{end+1} = 'limit';

Voss 2023-3-15

在 MATLAB Online 中打开

% random vectors (10x1) of values between 0 and 2

AA = 2*rand(10,1);

BB = 2*rand(10,1);

CC = 2*rand(10,1);

DD = 2*rand(10,1);

EE = 2*rand(10,1);

limit = 1;

X = 1:numel(AA);

figure()

hold on

obj = [];

names = {};

idx = DD < EE;

if any(idx)

obj(end+1) = plot(X(idx),AA(idx),'*', ...

'MarkerFaceColor',[0.5 0.5 0.5],'MarkerEdgeColor',[0.5 0.5 0.5]);

names{end+1} = 'A (D<E)';

obj(end+1) = plot(X(idx),BB(idx),'s', ...

'MarkerFaceColor',[0.5 0.5 0.5],'MarkerEdgeColor',[0.5 0.5 0.5]);

names{end+1} = 'B (D<E)';

obj(end+1) = plot(X(idx),CC(idx),'+', ...

'MarkerFaceColor',[0.5 0.5 0.5],'MarkerEdgeColor',[0.5 0.5 0.5]);

names{end+1} = 'C (D<E)';

end

if any(~idx)

idx2 = any([AA BB CC] > limit, 2);

if any(~idx & idx2)

obj(end+1) = plot(X(~idx & idx2),AA(~idx & idx2),'*', ...

'MarkerFaceColor','r','MarkerEdgeColor','r');

names{end+1} = 'A (D>=E)';

obj(end+1) = plot(X(~idx & idx2),BB(~idx & idx2),'s', ...

'MarkerFaceColor','r','MarkerEdgeColor','r');

names{end+1} = 'B (D>=E)';

obj(end+1) = plot(X(~idx & idx2),CC(~idx & idx2),'+', ...

'MarkerFaceColor','r','MarkerEdgeColor','r');

names{end+1} = 'C (D>=E)';

end

if any(~idx & ~idx2)

obj(end+1) = plot(X(~idx & ~idx2),AA(~idx & ~idx2),'*', ...

'MarkerFaceColor','g','MarkerEdgeColor','g');

names{end+1} = 'A (D>=E)';

obj(end+1) = plot(X(~idx & ~idx2),BB(~idx & ~idx2),'s', ...

'MarkerFaceColor','g','MarkerEdgeColor','g');

names{end+1} = 'B (D>=E)';

obj(end+1) = plot(X(~idx & ~idx2),CC(~idx & ~idx2),'+', ...

'MarkerFaceColor','g','MarkerEdgeColor','g');

names{end+1} = 'C (D>=E)';

end

yl = yline(limit, '--r', 'LineWidth',1);

names{end+1} = 'limit';

legend([obj yl],names)

ylims = ylim();

ylims(1) = min(0,ylims(1));

ylim(ylims);

Voss 2023-3-16

在 MATLAB Online 中打开

plot(x,AA,'s',x,BB,'+','Color',Co)
plot(x,BB,'p','Color',Co)

MattC 2023-3-22

Hey @Voss, I think this is not picking the right Co value from the function it picks the grey color anyways. I am not sure what's incorrect with the function. Can you please help?

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