How to shift xaxis location to origin (0,0) ?

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Nada Zamri 2016-6-20

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编辑： dpb 2016-6-20

Patient1.fig

Attached is my graph that I have plotted. How to shift the x axis position so that it will be plotted on y=0? Anyway I am using R2013a version of MATLAB.

thank you

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Answer 1

dpb 2016-6-20

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编辑：dpb 2016-6-20

在 MATLAB Online 中打开

OK, got a minute now...

hAx=axes;                      % a new axes
plot(randn(10,1))              % put some data on it...
yl=ylim;                       % get y-axis limits
pos=get(hAx,'position');       % and axes position vector
yrat=yl(end)/(yl(end)-yl(1));  % fractional position of origin relative y range
yht=yrat*pos(4);               % adjusted second axes height 
pos(2)=pos(2)+pos(4)-yht;      % new bottom is top position {pos(2)+pos(4)} less height
pos(4)=yht;                    % and new height into vector
hAx(2)=axes('position',pos,'color','none');  % second axes with this position an no color
set(hAx(2),'ytick',[])         % clear unwanted ticks from showing...
set(hAx(1),'xticklabel',[])    % clear labels on first x-axis
linkaxes(hAx,'x')              % and synchronize x-axes
grid(hAx(1),'on')              % just a touch

This produced

for a particular set of random data; your result will vary...

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Answer 2

dpb 2016-6-20

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Set 'YAxisLocation' to 'Origin' -- require HG2 R2014a(?) or later...

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Nada Zamri 2016-6-20

Anyway,I'm using R2013 version. Is there any other ways to shift the x axis?

dpb 2016-6-20

Not until the introduction of HG2 was the 'origin' value introduced; prior is only 'top','bottom'. You can draw an axes line wherever you want it w/ line of course, and label it with text but afaik that'd be the only way...

Oh, wait a minute -- use a second axis whose size/position is at the proper set of values to put its axis where you need it. I've gotta' run run now, but that'll work. Remember have to make the second one transparent so first will show through. There's example of using two axes in the doc's for graphics although they overlay them exactly, you've got to compute the ratio of the height wanted relative to the overall from the y-axis range.

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