Plotting Various Colors & Symbols

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Doug 2020-6-4

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/541835-plotting-various-colors-symbols

评论： Doug 2020-7-2

Hello,

I need help with the attached .mat file.

I am looking to make a series of 4 subplots for each D (Column 1) where each D is a different Symbol, and with that a different Color for each AR (Column 2). Each plot should look something similar to that of the attached Figure (Example_1).

After all the subplots I then need an additional plot at the end where I have all the data presented for 1 subplot for each D (Example_2).

Thanks in advance for the assistance.

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Adam Danz 2020-6-5

"I am looking to make a series of 4 subplots for each D"

There are only 3 unique RES.D values in your data so it's very unclear how to create 4 subplots from that.

You mention a time series. I dont' see any obvious time values in your table. It's clear the the D column defines the symbol and the AR column defines the color but you haven't described which column contains the data you're plotting.

Doug 2020-6-6

Apologies.

I'm looking for a series of subplots for each D. So one series of subplots for D = 48.3, one for D = 80, and one for D = 101.6. For each series of subplots its doesn't matter about which columns require plotting at this moment, just getting it setup to do say 4 subplots of the remaining data for each D.

Example:

Figure 1: D = 48.3

subplot 1 -> Re vs Fr_D

subplot 2 -> Re vs R_F

subplot 3 -> V vs R_F

etc.

Figure 2 is the same but for D = 80, and so on.

Hope this helps.

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Answer 1

Adam Danz 2020-6-7

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/541835-plotting-various-colors-symbols#answer_447692

编辑：Adam Danz 2020-6-12

在 MATLAB Online 中打开

This should get you started. You can tweek it to meet your needs and leave a comment if you have any problems.

It creates 1 figure with 3x3 subplots. You can easily create 3 figures with 1x3 or 2x2 subplots if you'd like.

load('RES_20200604_1215.mat')
[dGroup, dGroupID] = findgroups(RES.D); 
nGroups = numel(dGroupID); 
figure()
for i = 1:nGroups
    idx = dGroup==i; 
    subplot(nGroups,3,(i-1)*3+1)
    plot(RES.Re(idx), RES.Fr_D(idx), 'o'); 
    xlabel('Re', 'interpreter', 'none'); 
    ylabel('Fr_D', 'interpreter', 'none'); 
    title(sprintf('D = %.2f', dGroupID(i))); 
    
    subplot(nGroups,3,(i-1)*3+2)
    plot(RES.Re(idx), RES.R_F(idx), 'd');
    xlabel('Re', 'interpreter', 'none'); 
    ylabel('R_F', 'interpreter', 'none'); 
    title(sprintf('D = %.2f', dGroupID(i))); 
    
    subplot(nGroups,3,(i-1)*3+3)
    plot(RES.V(idx), RES.R_F(idx), 's');
    xlabel('V', 'interpreter', 'none'); 
    ylabel('R_F', 'interpreter', 'none'); 
    title(sprintf('D = %.2f', dGroupID(i))); 
end

General demo: Scatter plot with different colors and symbols

This demo uses your RES table. The "D" column defines the symbols and the "AR" column defines the colors. The x and y axes are "Re" and "R_F" values respectively.

Read the comments to understand the big-picture purpose of each line/section. If there's a function you're unfamiliar with, look it up in the documentation to understand its inputs and what it's doing.

The main idea is that each row of your table is assigned a different symbol based on D and a different color based on AR. The scatter() function can specify the color of each point but it can only plot one marker type at a time. So the rows of your table are plotted in a loop in groups of marker-type.

% Group rows by D-value
[dGroup, dGroupID] = findgroups(RES.D);
% Define a bunch of symbols but you'll only use 'n' of them where n is the number of values in dGroupID.
symbs = {'o' 's' 'd' 'p' '*' '^' 'v' '<' '>'};
% Group rows by AR value
[arGroup, arGroupID] = findgroups(RES.AR);
% Define m colors where m is the number of values in arGroupID.
% I'm using the jet() colormap; see the documentation for other colormaps. 
colors = jet(numel(arGroupID)); 
rowColors = colors(arGroup,:); %<-- color of each row
% Create figure
fig = figure(); 
ax = axes(fig); 
hold(ax, 'on')
% Plot R_F as a function of Re
% Loop through each D group
h = gobjects(size(dGroupID)); 
for i = 1:numel(dGroupID)
    % Match the rows that belong to the current D group
    idx = dGroup == i; 
    % Plot all values that belong to current AR group
    scatter(ax, RES.Re(idx), RES.R_F(idx), 50, rowColors(idx,:),symbs{i},'filled')
    
    % Create "dummy markers" that will not appear in the plot but will appear in the legend
    % DisplayName sets up the legend strings
    h(i) = plot(nan, nan, 'k', 'Marker', symbs{i}, 'LineStyle', 'none', 'DisplayName', sprintf('D = %.1f', dGroupID(i)));  
end
legend(h,'Location', 'NorthWest')
% Add colorbar, make sure the axis colormap is set to the colormap you used in the scatter plot
colormap(ax, colors)
cb = colorbar(ax);
% Set range of colormap values to AR values
caxis([min(arGroupID), max(arGroupID)])
% Label colorbar
ylabel(cb, 'AR values')

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Doug 2020-6-10

Yes, you are correct that D.AR dictates the colour.

I'll go with scatter, as you suggest it is easier to change the colours of points this way.

I could go with an RGB triplet for the matrix, but I am open to suggestions.

Back to your previoous comment regarding changing each subplot to "subplot(1,3,i) or subplot(3,1,i)", neither of these options output all 3 subplots in each figure, it is sometimes only providing 1 subplot.

Adam Danz 2020-6-10

Could I see your updated code?

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Answer 2

Doug 2020-6-11

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/541835-plotting-various-colors-symbols#answer_449474

在 MATLAB Online 中打开

RES_20200611_1220.mat

Adam see below for the code.

Another thing is that the symbols are not different for each diameter.

I have also attached an updated .mat file where the colours are in the last column in Hex format

    [dGroup, dGroupID] = findgroups(RES.D); 
    nGroups = numel(dGroupID); 
    
    for i = 1:3
        figure()
        idx = dGroup==i;
        
        subplot(1,3,i) 
        scatter(RES.Re(idx), RES.Fr_D(idx), 'o'); 
        xlabel('Re', 'interpreter', 'none'); 
        ylabel('Fr_D', 'interpreter', 'none'); 
        title(sprintf('D = %.2f', dGroupID(i))); 
        subplot(1,3,i) 
        scatter(RES.Re(idx), RES.R_F(idx), 'd');
        xlabel('Re', 'interpreter', 'none'); 
        ylabel('R_F', 'interpreter', 'none'); 
        title(sprintf('D = %.2f', dGroupID(i))); 
        subplot(1,3,i) 
        scatter(RES.V(idx), RES.R_F(idx), 's');
        xlabel('V', 'interpreter', 'none'); 
        ylabel('R_F', 'interpreter', 'none'); 
        title(sprintf('D = %.2f', dGroupID(i))); 
    end

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Doug 2020-6-30

编辑：Doug 2020-7-1

在 MATLAB Online 中打开

RES_20200630.mat

Adam,

I have gone a different route for the plotting, where everything is a bit more streamlined. I am now having an issue 1 portion of my plotting function...namely extracting the data from my results table.

See below for the code.

load RES_20200630.mat
[DGroup, DGroupID] = findgroups(RES.D);
[ARGroup,ARGroupID] = findgroups(RES.AR);
xvar = 'Fr_D'
yvar = 'R_F'
for jj = 1:3
    % Loop through the 3 diameters
    for colID = 1:10
        xdat = RES.(xvar)(contains(RES.D,DGroupID{jj}) & RES.AR == str2double(ARGroupID{colID}));
        ydat = RES.(yvar);
        alldat = [xdat ydat];
        figure(1);
        if subp>0
            subplot(2,2,colID)
        end
        scatter(alldat(:,1),alldat(:,2))%,markershapes{jj},'MarkerEdgeColor',markercolours{colId},'MarkerFaceColor',markercolours{colId})
        hold on
        figure(jj+1)
        if subp>0
            subplot(2,2,colID)
        end
        scatter(alldat(:,1),alldat(:,2))%,markershapes{jj},'MarkerEdgeColor',markercolours{colId},'MarkerFaceColor',markercolours{colId})
        hold on
    end
end

I am only working on the xdat issue atm, as it will apply to the ydat variable as well. The problem is that I am getting all the results, where as previously I am looking for only a select few, based on the D and AR.

I have tried using 'ismember' instead of contains, but that only allows for me to select data based on a single parameter (D).

You assistance on this issue would be appreciated.

Adam Danz 2020-7-1

Your data must be different than the data provided 3 comments above because the parentheses worked for me. Glad you worked it out! :)

Doug 2020-7-2

Whoops, I had changed the 'findgroups' to cells, instead of leaving them as they were. Oh well...it still works.

Thanks heaps for your help with this, it is much appreciated.

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Plotting Various Colors & Symbols

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