showing empty plot in nexttile or subplot

Question

Niraj Bal Tamang 2022-4-25

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1704990-showing-empty-plot-in-nexttile-or-subplot

回答： Niraj Bal Tamang 2022-5-3

采纳的回答： Chunru

I have 4 classes:

Class A: x=[0.1 0.2 0.3 0.6 0.24 0.67],y=[2 1 4 7 4 5],type=[a b a c d b]

Class B: empty

Class C: x=[0.24 0.4 0.32 0.5 0.1],y=[3 1 4 2 6], type=[c a d c b]

Class D: x=[0.5 0.2 0.4 0.1 0.2],y=[4 1 5 2 6], type=[d d b a c]

I want to generate a 2rows 2 columns group plot (nexttile or subplot or any other possible way) such that I can have plot of xy values based upon the color from type variable (the color of a particular type should be same for all classes, for eg. if color of a is red in Class A, then it should be red in Class B,C and D). I also want to include empty Class B to show that there is no data distribution in Class B. Can anyone please help me with this. Thank you

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Answer 1

Chunru 2022-4-26

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https://ww2.mathworks.cn/matlabcentral/answers/1704990-showing-empty-plot-in-nexttile-or-subplot#answer_951060

在 MATLAB Online 中打开

a = "r"; b="g"; c="b"; d="m";

x{1}=[0.1 0.2 0.3 0.6 0.24 0.67];

y{1}=[2 1 4 7 4 5];

t{1}=[a b a c d b]

t = 1×1 cell array

{["r" "g" "r" "b" "m" "g"]}

x{2} = [];

y{2} = [];

t{2} = [];

x{3}=[0.24 0.4 0.32 0.5 0.1];

y{3}=[3 1 4 2 6];

t{3}=[c a d c b];

x{4}=[0.5 0.2 0.4 0.1 0.2];

y{4}=[4 1 5 2 6];

t{4}=[d d b a c];

tiledlayout(2, 2);

for i=1:4

nexttile

hold on

for j=1:length(x{i})

plot(x{i}(j), y{i}(j), "Marker", 'o', "MarkerEdgeColor", t{i}(j), "MarkerFaceColor", t{i}(j))

end

hold off

end

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Chunru 2022-4-28

编辑：Chunru 2022-4-29

在 MATLAB Online 中打开

L ooks like that last cell of t is not correct.

load('t.mat'); load('x.mat'); load('y.mat');

%whos

x, y, t

x = 1×6 cell array

{0×0 double} {25×1 double} {0×0 double} {94×1 double} {0×0 double} {37×1 double}

y = 1×6 cell array

{0×0 double} {25×1 double} {0×0 double} {94×1 double} {0×0 double} {37×1 double}

t = 1×6 cell array

{3×1 cell} {37×1 cell} {0×0 double} {94×1 cell} {0×0 double} {25×1 cell}

% concatenate t to get all types available

tall =[];

for i=1:length(t)

if ~isempty(t{i})

tall = [tall; string(t{i})];

end

ut=unique(tall); % unique types

ntypes = length(ut)

ntypes = 16

c = jet(ntypes); % different colors for different types

tiledlayout(2, 3);

for i=1:6

nexttile

hold on

% i, size(x{i}), size(y{i}), size(t{i})

for j=1:length(x{i})

if j>=length(t{i}) % this is not necessary if t{i} has enough entries

mc = ntypes; % use last color

else

mc = find(t{i}(j)==ut);

end

%mc = find(t{i}(j)==ut);

plot(x{i}(j), y{i}(j), "Marker", 'o', "MarkerEdgeColor", c(mc,:), "MarkerFaceColor", c(mc,:))

end

hold off

end

l=nexttile('south');

for i=1:ntypes

plot(nan(2,1), 'o', 'MarkerEdgeColor', c(i,:), 'MarkerFaceColor', c(i,:)); hold on

end

l.Visible = 'off';

lgd = legend(l, ut);

lgd.Location = 'east';

lgd.NumColumns = 4;

Chunru 2022-4-29

Need some tricks to get the legend correct. See above

Niraj Bal Tamang 2022-4-30

Thanks a lot. Yeah, it does seems trickier. I am sorry to say but I think it is still not giving the correct plot. The names seem to get mixed up during concatenation while generating the tall variable. And the x,y value seems to be linked with the random names within tall variable. I have attached the edited x, y and t variables here again after correcting from your first comment. To verify the code, I ran it in these variables but in the first plot with single point, the x and y values are correctly plotted but the name is not matching (It is showing the color of Wairau instead of Conway).

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Answer 2

Niraj Bal Tamang 2022-5-3

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1704990-showing-empty-plot-in-nexttile-or-subplot#answer_956575

在 MATLAB Online 中打开

Thanks a lot. I finally got the plot. I removed the = sign from if j>=length(t{i}) line to if j>length(t{i}) and it worked.

for j=1:length(x{i})
        if j>length(t{i})  % this is not necessary if t{i} has enough entries
            mc = ntypes;        % use last color
        else
            mc = find(t{i}(j)==ut);
        end
        %mc = find(t{i}(j)==ut);

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showing empty plot in nexttile or subplot

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showing empty plot in nexttile or subplot

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