MATLAB: Create diagram where y axis has zero limits two times (-1 to 0,0 to 0,0 to 1)

diagramy axis

Greeting to everyone,

I am trying to write a code that draws a curve like the one in the picture that I attach.My problem is that I cannot find how to set the y axis to take values from -1 to 0,0 to 0,0 to 1. Is it possible to do this in matlab and if so how?

I hope the picture clarifies the problem.Just look at the y values.

https://www.dropbox.com/s/bl397yio0tu1u2d/IMG_0001.jpg

Any help would be highly appreciated.Thanks in advance

Best Answer

This will get you started. I include most of the properties you will need to make it look right. You should look at the other axes properties. In particular the 'Ydir' property might come in useful.

ax(1) = axes('pos',[.1 .2 .8 .2],...
             'ylim',[-1 0])
ax(2) = axes('pos',[.1 .4 .8 .2],...
             'xtick',[],'xcolor','w',...
             'ylim',[0 1]);

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I patched together this example using a figure callback function. You can try it and modify according to your requirement

im_left = im2double(imread('pears.png')); % opening two example images
im_right = im2double(imread('peacock.jpg'));
im_right = imresize(im_right, size(im_left, [1 2])); % making the dimensions equal
f = figure();
ax = axes('Units', 'pixels');
imshow(im_left);
hold(ax);
im_handle = imshow(im_right);
im_handle.AlphaData = zeros(size(im_left, [1 2]));
axes_pos = cumsum(ax.Position([1 3]));
f.WindowButtonMotionFcn = {@cb,  size(im_left,2), im_handle, axes_pos};
function cb(obj, ~, im_width, im_handle, axes_pos)
    x_pos = obj.CurrentPoint(1);
    if x_pos > axes_pos(1) && x_pos < axes_pos(2)
        left_cols = floor(floor(x_pos - axes_pos(1))/diff(axes_pos) * im_width);
        im_handle.AlphaData(:, 1:left_cols) = 0;
        im_handle.AlphaData(:, left_cols+1:end) = 1;
    end
end

MATLAB: Matlab : 2 x-axis with one plot

I guess that the problem is that the y axis of ax2 overlaps with that of ax1, and the ticks are different. You can remove the ticks of ax2. It should look like there is no additional y axis

 set(ax2,'Ytick',[]);

As to the scale on the second (x) axis, you just need to set the xlim property. E.g.

 set(ax2,'xlim',[1 2]);

Or, with focus on ax2 ("axes(ax2)") you can use the xlim function

 xlim([1 2])

Best Answer

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