How to change the colour of the markers on a scattered graph?

Hi all,

I have a data set which is 5 * 1 double (BMC_14_whole_sum) which is like 8.5, 8.8, 9.3 etc and I am plotting that in a boxplot and scatter graph to show where exactly the markers are. Below is what I have tried so far:

BMC_14_whole_sum = sum(BMC_14_whole,2);
boxplot(BMC_14_whole_sum)
hold on
scatter(ones(size(BMC_14_whole_sum)).*(1+(rand(size(BMC_14_whole_sum))-0.5)/10),BMC_14_whole_sum, 'filled')
hold off
title('BMC Whole W14')

I have attached my .mat file. The image above is something similar to what I get. I would like to have those 5 different markers to have 5 different colours and possibly 5 different marker styles as well. How can I do that? Also, if there is a simpler codes to plot the scatter graph rather than using (ones(size(BMC_14_whole_sum)).*(1+(rand(size(BMC_14_whole_sum))-0.5)/10),BMC_14_whole_sum), please suggest me too.

Thank you so much for the help

Answer 1

[Star Strider]

Try this —

LD = load('aw_w14_scans.mat');
BMC_14_whole = LD.BMC_14_whole;

BMC_14_whole_sum = sum(BMC_14_whole,2);
boxplot(BMC_14_whole_sum)
hold on
scatter(ones(size(BMC_14_whole_sum)).*(1+(rand(size(BMC_14_whole_sum))-0.5)/10),BMC_14_whole_sum, [], (1:numel(BMC_14_whole_sum)), 'filled')
colormap(jet)
hold off
title('BMC Whole W14')

The colours are defined here by ‘(1:numel(BMC_14_whole_sum))’. Choose whatever colormap you want.

There is nothing similar to colororder for markers, so changing the markers would require a loop.

mv = 'psdo^';
cm = colormap(jet(numel(BMC_14_whole_sum)))

xv = ones(size(BMC_14_whole_sum)).*(1+(rand(size(BMC_14_whole_sum))-0.5)/10);
yv = BMC_14_whole_sum;

figure
boxplot(BMC_14_whole_sum)
hold on
for k = (1:numel(BMC_14_whole_sum))
    scatter(xv(k), yv(k), [], cm(k,:), 'filled', 'Marker',mv(k))
end
hold off
title('BMC Whole W14')

.

[Hyeonjun Park]

Thank you for helping me!

[Star Strider]

As always, my pleasure!

[Hyeonjun Park]

Hey, I have another question.

If I have another set of data that is 6*4 double instead of 5*4 double like BMC_14_whole, what should I change to to show 6 markers on the graph?

I am getting the error below.

Index exceeds the number of array elements (5).

[Star Strider]

Nothing in your code or my code specifies a value of 5 for any parameter.

Most likely, all you need to do is to replace ‘BMC_14_whole’ with whatever variable you are currently working with.

.

[Hyeonjun Park]

oh alright thank you!

[Star Strider]

As always, my pleasure!

.

Answer 2

[ANKUR KUMAR]

I don't think I understood your question completely. Please do attach sample data (probably in a .mat file) and your complete code. But I picked a line, and trying to answer that.

Answering this question:

" I can't seem to find a way. I would like to have 5 different markers to have 5 different colours. How can I do that?"

x = linspace(0,1*pi,200);
y = cos(x) + rand(1,200);

cols={'r','b','g','m','k'}; % If you want random colors, you can just simply generate RGB random numbers using randi commmand
markers={'d','o','+','^','*'};

for index=1:5
    scatter(x,sin(x*index),cols{index},markers{index})
    hold on
end
legend(strcat('Sin ',{' '},string([1:5]),'x'),'box','off','location','best')

[Hyeonjun Park]

Hi Ankur,

Thanks for helping me with my problem.

I have edited the original post with .mat file in the attachment and I hope you understand it better with the updated post.

Can you help me?

[ANKUR KUMAR]

@Star Strider properly answered your question. I don't want to repeat the code. Refer to his answer.

[Hyeonjun Park]

Alright thank you Ankur!

Answer 3

[Steven Lord]

See the "Vary Circle Color" and "Fill the Markers" examples on the documentation page for the scatter function.