How to change the axes position in matlab

Hi Everybody! I want to be able to relocate my axes/the origin (0, 0) of my plot to the middle of the graphics window. I don't know how to manipulate the set command to do this. There must be a way. Regards

% Code explores advanced graphics properties
clf
x= 0:pi/10:pi;
angle = x.*180/pi;
y = -sind(angle);
h =plot(angle, y)
set(h, 'color', 'red')
set(h, 'marker','s')
set(h, 'LineWidth', 2)
h_axis =gca; % Manipulate theaxis next
set(h_axis, 'LineWidth', 2)

[Jan]

I've formatted the code...

What does "relocate" exactly mean? Do you want to set the position of the axes object or move only the line through the origin?

[Chuzymatics Chuzymatics]

Yeah, I want to set the position of the axes object

[Chuzymatics Chuzymatics]

Please take a look at the attached file to understand what I am talking about. Pay attention to the position of the x and y axes. Thanks

Answer 1

[dpb]

Not a settable choice in handle graphics -- x-axis can be "top|bottom" and y is either "left|right" -- "center" isn't a choice. Seems strange a a weakness, granted.

Try the File Exchange to see if somebody has submitted a package with the ability; otherwise one has to make it by drawing the axis manually at the location desired or fake it by using two axes each of half the size to split in the middle, say.

Answer 2

[Geoff Hayes]

Chuzymatics - if you are just trying to move the origin (0,0) to the centre of the figure, then you could try the following which just resets the axes limits so that (0,0) is in the centre. From your above code, you have the handle to the current axes

 % handle to the current axes
 h_axis =gca;

 % determine the max absolute value along the x-axis
 maxX = max(abs(get(h_axis,'XLim')));

 % determine the max absolute value along the y-axis
 maxY = max(abs(get(h_axis,'YLim')));

 % now reset the limits for the axes so that (0,0) is in the centre
 axis(h_axis,[-maxX maxX -maxY maxY]);

Or, instead of axis , you can use xlim and ylim.

Try the above and see what happens!

[Chuzymatics Chuzymatics]

Thanks Geoff. I tried the code but it did not yield the desired result. I attach a file to this comment to help you understand what I was trying to say; please observe the positions of both the x and y axes, that's what I want to achieve. Thanks again.

[dpb]

See above...will have to draw the axes in the center or, hopefully, there's a File Exchange submission that does so...

[Geoff Hayes]

A similar request was made at move the axes. The code that is attached to the answer is a file called drawaxis.m...though it didn't quite do what I thought it would. I modified it in two places by replacing

 if (myX_Crossing< props.XLim(1)) | (myX_Crossing> props.XLim(2))
        error('Specified X crossing outside axis limits')
        return
 end

with

 if (myX_Crossing< props.YLim(1)) || (myX_Crossing> props.YLim(2))
        error('Specified X crossing outside y-axis limits')
 end

and replacing

 if (myY_Crossing< props.YLim(1)) | (myY_Crossing> props.YLim(2))
        error('Specified Y crossing outside axis limits')
        return
 end

with

 if (myY_Crossing< props.XLim(1)) || (myY_Crossing> props.XLim(2))
        error('Specified Y crossing outside x-axis limits')
 end

To use, just do as follows

 % plot the function
 x=0:0.0001:2*pi;
 y=sin(x);
 plot(x,y);

 % move the axes so that the y-axis is located at pi along the
 % x-axis, and the x-axis is located at 0 along the y-axis
 drawaxis(gca, 'y', pi)
 drawaxis(gca, 'x', 0)

Note that moving the graphic after that may cause the axes to become disrupted.

Answer 3

[dpb]

A start...still, check File Exchange; may already be done for you...

>> x=linspace(0,2*pi,100); y=sin(x);
>> plot(x,y)
>> set(gca,'visible','off')
>> line([0 2*pi],[0 0],'color','k')
>> line([pi pi],[-1.2 1.2],'color','k')
>> xlim([0 2*pi]), ylim([-1.2 1.2])
>> text([0:pi:2*pi],-0.1*ones(1,3),num2str([0:pi:2*pi].','%0.3f'), ...
      'horizontal','center','vertical','top','fontsize',8)

Add text for the vertical similarly as well as the ticks w/ a series of line segments.

But, as expected, there's a routine from Matt Figg at FileExchange --

http://www.mathworks.com/matlabcentral/fileexchange/22956-axescenter

that has rave revues...