How to color values in corrplot function?

Question

Felix Bechtle 2024-4-2

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2101916-how-to-color-values-in-corrplot-function

评论： Felix Bechtle 2024-8-17

Hello,

I created a corrplot with the fisheriris dataset.

I wanted to add a 3rd dimension in the corrplot coloring the values to the corresponding species, like in the following plot.

Is this possible in Matlab?

Thanks for the help and all the best!

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Dyuman Joshi 2024-4-2

It's not clear to me how you want to group values in the corrplot.

Although, you can get the handle to the graphics objects present in a corrplot() and modify the color (and other properties) of the objects accordingly.

Felix Bechtle 2024-8-4

I wanted to colour each species data point the same colour.

I've looked through the corrplot function documentation and haven't really found a good way for me to do this.

The datasource I am using is https://www.kaggle.com/datasets/uciml/iris/data.

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Answer 1

Voss 2024-4-2

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https://ww2.mathworks.cn/matlabcentral/answers/2101916-how-to-color-values-in-corrplot-function#answer_1435136

编辑：Voss 2024-4-2

在 MATLAB Online 中打开

Here's one way:

load fisheriris

[~,~,h] = corrplot(meas);

g = findgroups(species);

idx1 = find(g == 1);

idx2 = find(g == 2);

idx3 = find(g == 3);

for ii = 1:4

for jj = 1:4

if ii == jj

continue

end

old_line = h(ii,jj);

new_line_1 = copyobj(old_line,old_line.Parent);

new_line_2 = copyobj(old_line,old_line.Parent);

set(old_line,'MarkerIndices',idx1)

set(new_line_1,'MarkerIndices',idx2,'Color',[0.85 0.325 0.098])

set(new_line_2,'MarkerIndices',idx3,'Color',[0.929 0.694 0.125])

end

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Umar 2024-8-4

编辑：Walter Roberson 2024-8-5

在 MATLAB Online 中打开

Hi @Felix Bechtle,

Please see my response to your questions below.

Can I change the points as filled dots/circles in the corrplot function?

To change the points to filled dots/circles in a corrplot, you can modify the marker style using the Marker property. Here's how you can achieve this:

old_line = h(ii, jj);
new_line_1 = copyobj(old_line, old_line.Parent);
new_line_2 = copyobj(old_line, old_line.Parent);
% Change marker style to filled circles
set(old_line, 'Marker', 'o', 'MarkerIndices', idx1)
set(new_line_1, 'Marker', 'o', 'MarkerIndices', idx2, 
'Color', [0.85 0.325 0.098])
set(new_line_2, 'Marker', 'o', 'MarkerIndices', idx3, 'Color', [0.929 0.694 0.125])

Can I create the legend for the categories/groups/species directly in the code, the location doesn't really matter?

To create a legend for the categories/groups/species directly in the code, you can use the legend function. You can specify the labels for each group and customize the location of the legend as needed. Here's an example:

% Create legend for species
legend('Species 1', 'Species 2', 'Species 3', 'Location', 'best')

Also, is it possible to format the labels on the axes as if you were using the table as data input for the function and viewing the table?

If you want to format the labels on the axes as if using a table as data input, you can set the XTickLabel and YTickLabel properties of the plot. Here's how you can format the labels:

% Example of formatting X-axis labels
xticklabels({'Label 1', 'Label 2', 'Label 3', 'Label 4'})
% Example of formatting Y-axis labels
yticklabels({'Label A', 'Label B', 'Label C', 'Label D'})

Hope this answers all your questions.

Voss 2024-8-5

编辑：Voss 2024-8-5

在 MATLAB Online 中打开

For question 3 (axis labels), you can try specifying the variable names in corrplot directly:

load fisheriris
[~,~,h] = corrplot(meas,'VarNames',{'SepalLength','SepalWidth','PetalLength','PetalWidth'});

However, the result looks like one of your previous screen shots, and I'm not sure why the labels are cut off after 5 characters. Increasing the figure size doesn't help:

fpos = get(gcf,'Position');

fpos([3 4]) = [1000 1000];

set(gcf,'Position',fpos)

For question 2 (legend), you need to specify the lines/objects that the legend should contain (if you omit this, legend uses the objects in the current axes, which is the last histogram plot - obviously not the right lines to use in the legend). In this case, since you say it doesn't matter where the legend is, then it doesn't matter which lines you use as long as you have one blue one, one red one, and one yellow one (in other words, they can be from any axes that's not on the diagonal). For convenience, you can use lines in the axes in row 4 column 3, which is the last one processed in the loops. In other words, just using the final value of old_line, new_line_1, and new_line_2 should work sufficiently (and I use the 'Location','best' option to try to avoid the legend overlapping the data):

load fisheriris

[~,~,h] = corrplot(meas,'VarNames',{'SepalLength','SepalWidth','PetalLength','PetalWidth'});

g = findgroups(species);

idx1 = find(g == 1);

idx2 = find(g == 2);

idx3 = find(g == 3);

for ii = 1:4

for jj = 1:4

if ii == jj

continue

end

old_line = h(ii,jj);

new_line_1 = copyobj(old_line,old_line.Parent);

new_line_2 = copyobj(old_line,old_line.Parent);

set(old_line,'MarkerIndices',idx1)

set(new_line_1,'MarkerIndices',idx2,'Color',[0.85 0.325 0.098])

set(new_line_2,'MarkerIndices',idx3,'Color',[0.929 0.694 0.125])

old_line.MarkerFaceColor = old_line.Color;

new_line_1.MarkerFaceColor = new_line_1.Color;

new_line_2.MarkerFaceColor = new_line_2.Color;

end

legend([old_line,new_line_1,new_line_2],{'Species 1','Species 2','Species 3'},'Location','best')

Felix Bechtle 2024-8-17

Thanks @Voss, @Umar.

With the last two hints i was able to solve all my points.

Felix

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