plot tools：add data color

the default color is blue,but i want to make the color of the data added black,so how to make it?

Answer 1

[AJ von Alt]

If you want to make the line black at the time of plotting, add the argument 'k' to the plot command.

Example:

figure;
x = 0:0.1:10;
y = sin( x );
plot( x , y , 'k');

If you have a line that is blue and you want to make it black, you can use findobj to get the handle of the blue line and then set its color property value to black manually.

Example:

% plot something
figure;
x = 0:0.1:10;
y = sin( x );
plot( x , y  , 'Blue' );

% the color values for blue and black
blue  = [ 0 0 1 ];
black = [ 0 0 0 ];

% get the handle for the blue line
hline = findobj( gca , 'color' , blue );
% Set the line's color property value to black 
set( hline(1) , 'color' , black )

[Roger]

'gca' should be 'gcf'

[AJ von Alt]

The handle should ideally be the explicit handle of the axis containing the line that we wish to change (something like handles.axes1). This handle should be available as part of a gui function's arguments. If the entire figure is searched, handles for all blue lines in the entire figure will be returned.

[Roger]

yes,when i write set(findobj(gcf,'color','blue'),'color','black'); in mycommond window,all blue lines changed to black. there is a problem. the figure is maked by my gui , but after i wrote set(findobj(gcf,'color','blue'),'color','black'); in a pushbutton callback , it cannot work. what i want is to changed all blues lines to black once, then i need not to do it for every line by using plot tools,

Answer 2

[Amit]

http://www.mathworks.com/help/matlab/creating_plots/plotting-tools--interactive-plotting.html