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How to add a 1:1 reference line

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Ellen Maas
Ellen Maas 2020-11-13
评论： Star Strider 2020-11-14
Hi, I am trying to add a dashed 1:1 reference line to subplots of data correlations. The range of values is the same for both x and y.
I have tried refline, but it appears to be tied to the range of the data, such that it only extends across the plot where there are data points.
For example:
In the plot above, the 1:1 line stops short of the lower-left and upper-right corners. I want a line that goes all the way from the point of origin to the upper right-hand corner of the plot, such as in this plot:
It only works in this graph because there are data points closer to the corners. I want a line that is not dependent on the data, like xline or yline, but has a slope of 1.
Any help is greatly appreciated!

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Star Strider
Star Strider 2020-11-14
I am not certain what you want.
Try this:
x = rand(1,10); % Create Data
y = rand(1,10); % Create Data
figure
plot(x, y, '.')
hold on
plot(xlim, ylim, '--r')
hold off
legend('Data', 'Reference Line', 'Location','SE')
.
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Ellen Maas
Ellen Maas 2020-11-14
So I just tried this, and it works for all the graphs and axis ranges:
plot([0 ylim*2], [0 ylim*2], '--r')
Now the line extends all the way across. None of my axes are less than 0, so having 0 as the minimum value will not cause any problems.
Thank you for your help in thinking this through!
Star Strider
Star Strider 2020-11-14
As always, my pleasure!
If any are less than 0, an extension of this idea will work similarly:
plot([min([xlim ylim]) max([xlim ylim])], [min([xlim ylim]) max([xlim ylim])], '--r')
That generalises it to any range.

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