MATLAB: Where in the axes properties (or elsewhere) is the “pointer” on the next color of ColorOrder

colororderline

The command

hold all

holds the current line color in the ColorOrder, so that following plot commands continue cycling through it. This seems to be only a feature of high-level-functions like plot. However, there must be a change in the 'axes properties' (besides the 'NextPlot' property), something like a pointer telling the next plot, which color to be used.

My problem is that I use low-level-function 'line' and want to add another line(s) in the next color of ColorOrder. Is there a more simple way to realize this instead of getting the existing line objects color by some functions as get,findobj and then choosing a non-used color for current line, which could not really considered as cycling.

Thanks.

Best Answer

Maybe not exactly what you wanted but a workaround:

fH = figure;
aH = axes;
lH = plot(rand(10,1),'r');
your_colors = get(fH,'DefaultAxesColorOrder');
colorIdx = find(ismember(your_colors,get(lH,'Color'),'rows'));
nextColorIdx = mod(colorIdx + 1, size(your_colors,1));
nextColor = your_colors(nextColorIdx,:);

I think creating your own custom color order and cycling through it would be better. The snippet I gave you will not work if the color of the line you plot is not in the default colors.

Related Solutions

MATLAB: How to cycle through the ‘ColorOrder’ for the MATLAB figure when making multiple calls to the plot

The ColorOrder property is only respected when plotting the entire data with all sequences calling the PLOT command only once.

If you must use a FOR loop to call the PLOT command, each successive call of the PLOT command is treated independently and will only consider the first value of the ColorOrder sequence.

To resolve this, you can consider (1) vectorizing your code such that the PLOT command is called only once or (2) use a FOR loop construct by creating your own color order sequence and manually specifying the color marker in each PLOT command within the loop. These two options will be discussed next.

OPTION (1):

The behavior you are experiencing is the result of calling the plot command multiple times. When the plot command is called, it always starts with the first color defined in the axes ColorOrder property. Therefore, if you are only plotting one line at a time, it will always use the same color - the first color in the ColorOrder.

The plot command cycles through colors when more than one line is plotted at a time. For example:

plot(rand(10,5))

This will plot five lines, one line for each column. If you are using the default ColorOrder, then each line is a unique color.

If it is possible to vectorize your code, then the plot command will automatically cycle through colors. For example:

x = linspace(0,2*pi,50);
y = sin(x);
i = 1:10;
X = x' * ones(size(i));
Y = y' * i;
plot(X,Y)

OPTION (2):

If, however, the number of points in your data changes during each iteration through the loop, then you will have to define your own color matrix and index into this matrix to determine which color to use for the plot. Below is an example of how to do this:

% Create some data
x = linspace(0,2*pi,50);
y = sin(x);
% Define your own Color Order Matrix
% For this example I used the default.
% It should be a 3-column matrix with entries in [0,1]
ColOrd = get(gca,'ColorOrder');
% Determine the number of colors in
% the matrix
[m,n] = size(ColOrd);
hold on
% Plot the data

for k = 1:10
    % Determine which row to use in the
    % Color Order Matrix
    ColRow = rem(k,m);
    if ColRow == 0
      ColRow = m;
    end
    % Get the color
    Col = ColOrd(ColRow,:);
    % Plot the data
    plot(x,k*y,'Color',Col)
    hold on
end
hold off
axis normal

When both the 'ColorOrder' and 'LineStyleOrder' are set, the line style is the major attribute, and color is the minor. This means that MATLAB will cycle through all the colors before changing to another line style.

For example:

set(0,'DefaultAxesColorOrder',[1 0 0;0 0 1])
set(0,'DefaultAxesLineStyleOrder','-|*')
plot(rand(4))

This will produce 4 lines. Below is a table which illustrates the color and line style for each line:

         LINE    Line Style      Color
         1       -               [1 0 0]
         2       -               [0 0 1]
         3       *               [1 0 0]
         4       *               [0 0 1]

The line style is fixed while MATLAB cycles through the colors. Once all the colors are used, MATLAB moves on to the next line style and repeats the procedure until all the lines are drawn.

If MATLAB runs out of colors and line styles, MATLAB starts with the first color and first line style again and repeats the same procedure until all lines are drawn.

If you would like to cycle through line styles and not colors, you must first set the axes ColorOrder property to a singles color. Next, set the axes LineStyleOrder property to the desired line styles. For example:

set(0,'DefaultAxesColorOrder',[1 1 1])  % [1 1 1] == white
set(0,'DefaultAxesLineStyleOrder','-|:|*')
plot(rand(3))

MATLAB: Change automatically colors and line style

Hi Alain,

The hold all command used the ColorOrder .

By default there are only 7 elements (read: colors) defined in the ColorOrder , thus 7 repeated consecutive colors.

You can define your custom ColorOrder for specific figure (axis).

For example,

% check default ColorOrder
ColorOdrDef = get(gca,'ColorOrder'); %7x3 RGB array
%define your custom color order
ColorOdrCustom = [0 0 1;...
          0 1 0;...
          1 0 0;...
          0 1 1;...
          1 0 1;...
          1 0.69 0.39;...
          0.6 0.2 0;...
          0 0.75 0.75;...
          0.22 0.44 0.34;...
          0.32 0.19 0.19]; %10x3 RGB array
set(gca,'ColorOrder',ColorOdrCustom);

Hope that helps,

Best Answer

Related Solutions

MATLAB: How to cycle through the ‘ColorOrder’ for the MATLAB figure when making multiple calls to the plot

MATLAB: Change automatically colors and line style

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