how to set the axis in matlab to actual data min and max

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Tadgh Cullen
Tadgh Cullen 2015-6-19
评论： Mike Garrity 2015-6-19
I'm plotting data and the x and y axis are setting the min and max to 0 and 300 but the actual data min and max is -6.1686 and -6.06 respectively. I've attached three images showing what I get, proving the min and max values and finally the expected axis labels.
Would really appreciate some help on how to solve this. Even if there is a manual way to set this and keep the generated image in position.
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Mike Garrity
Mike Garrity 2015-6-19
The issue is that you haven't told contourf what your X coordinates are. The contourf command has a form which takes 3 args:
contourf(X,Y,V)
If you omit the first two, then it just uses the row and column indices of V as the X & Y coordinates.
I'm not entirely sure what your data looks like, but I would expect your calls to contourf to look something like this:
contourf(x,y,x)
% ...
contourf(x,y,y)

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Image Analyst
Image Analyst 2015-6-19
See if you can use the actual y min and max in ylim() to override the default y axis range:
yMin = min(y(:));
yMax = max(y(:));
ylim([yMin, yMax]);

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