How can i fill a marker with color?

Rainflow_input1.txt

https://www.mathworks.com/matlabcentral/answers/uploaded_files/59944/Rainflow_Input1.txt

Hi,

I have two plots. How can I fill the marker in plot2? At the moment it is empty.

Input_Matrix = textread('Rainflow_Input1.txt') 
[zeilen,spalten]=size(Input_Matrix)
x = Input_Matrix(:,1)
y = Input_Matrix(:,2)
z = Input_Matrix(:,3)
colorbar('location','Manual', 'position', [0.93 0.1 0.02 0.81]);
a=30
scatter(x,y,a,z,'filled')
colorbar;
[dummy ID]=sort(z);
colors=colormap(jet(length(z)));
figure
for i=1:length(z)
plot(x(i),y(i),'s','Color',colors(ID(i),:));
hold on
end

[Philipp Mueller]

with -> plot(x(i),y(i),'s','MarkerFaceColor',colors(ID(i),:)); ???

Answer 1

[MathWorks Support Team]

If you are only plotting markers, and not any lines, you can create a plot with filled markers by calling the "scatter" function with the "filled" option. 

x = rand(1,50); 
y = rand(1,50); 
colors = jet(numel(x)); 
scatter(x,y,[],colors,'filled','s') 

If you need to use the "plot" function, you can set the "MarkerFaceColor" property. If you want the edges of the markers to match, set the "MarkerEdgeColor" property to the same color values. 

figure  
hold on  

for i=1:50  
  plot(x(i),y(i),'s','MarkerFaceColor',colors(i,:),'MarkerEdgeColor',colors(i,:));  
end  

hold off

Also, you don’t need to call "hold on" at each iteration of the loop. You can call it once just before plotting. Call "hold off" when you’re all done. 

You can find more examples of setting marker colors in the documentation:

Specify Marker Colors in a Scatter Plot

https://www.mathworks.com/help/matlab/creating_plots/specify-plot-colors.html#mw_9ff0ca4d-33b0-4b96-b5b5-0f68092b0211

Answer 2

[Walter Roberson]

Yes, you can use MarkerFaceColor to fill markers.

Note that only one 'MarkerFaceColor' will be paid attention to for any plot() call, even if you are requesting to plot multiple items.

As you are not drawing lines, you should consider instead using scatter(). You can specify the color of each point for scatter, and use the 'filled' option.

Answer 3

[Forrest Mobley]

It's also doable to just choose whatever predefined color as when choosing what your marker color is.

For example: plot(x,y,'or','MarkerFaceColor','r');

This will give your marker face and marker outline the same color, red.

[KAE]

If you aren't picking the color yourself, but it's getting set by the plot color order, you can still fill it with the same color as the marker edges or line plot as follows,

x = rand(1,5); y = rand(1,5); % Example data
h1 = plot(x, y, '-o'); % Plot a line and circle markers
set(h1, 'markerfacecolor', get(h1, 'color')); % Use same color to fill in markers

[Luis Humberto Niño Alvarez]

Thanks KAE!!!, very useful

Answer 4

[MathWorks Support Team]

If you are only plotting markers, and not any lines, you can create a plot with filled markers by calling the scatter function with the 'filled' option.

scatter(x,y,[],colors,'filled','s') 

If you need to use the plot function, you can set the MarkerFaceColor property. If you want the edges of the markers to match, set the MarkerEdgeColor property to the same color values.

figure 
hold on 
 
for i=1:length(z) 
  plot(x(i),y(i),'s','MarkerFaceColor',colors(ID(i),:), ... 
      'MarkerEdgeColor',colors(ID(i),:)); 
end 
 
hold off 

If you want the markers to have the same color as the axes background color, set the MarkerFaceColor property to 'auto' to fill the markers with that color.

Also, you don’t need to call hold on at each iteration of the loop. You can call it once just before plotting. Call hold off when you’re all done.