Wrong axis value in correlation plot

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JT Yang
JT Yang 2019-7-13
编辑： Amin Salehi 2023-12-7
Hi, I used correlation plot(corrplot) and getting the following graph. And it is obvious the var2 is bounded by -1 from the two scatter plot and as well as from the data. But the second histogram starts from a starting value much smaller value. I'm not sure is it a bug or my setting problem. Actually I did not do any settings, this is the default output from corrplot.
untitled1.jpg
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the cyclist
the cyclist 2019-7-13
Can you upload your data and code? This would make your problem easier to diagnose.
JT Yang
JT Yang 2019-7-13
Hi, it is simple two columns of data as in the attachment.
command used:
load('matlab.mat')
corrplot(MCMC)
MATLAB R2019A linux version

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the cyclist
the cyclist 2019-7-13
I don't have the Econometrics Toolbox, so I can't confirm myself. But if that is really the only thing you did, then I think this is either a bug or a very unconventional choice on the part of Mathworks. I did this same style plot in R (using the psych library), and the output as you expect it -- with labeling of the figures aligned for both the histogram and the scatterplot. I can't think of a reason to not do it that way.
So, if you are sure that you have not adjusted the scatterplot axes after running the above commands, then I would submit a bug report, including your data and code.
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JT Yang
JT Yang 2019-7-14
Hi, thanks cyclist, I am also testing with Python matplotlib, it seems fine to plot the same type plot.
I'm not sure whether it is a bug or design preference. But I think it is good to share.

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更多回答（2 个）

dpb
dpb 2019-7-13
编辑：dpb 2019-7-13
It's a confusing labeling problem -- the ticks aren't actually the variables on the plot for the histogram but for the scatter plots -- the axes values are for the scatter plot in the upper right quadrant which is scatter(x(:,2),x(:,1)) while the lower left is scatter(x(:,1),x(:,2)).
So, the x-axes limits are for var2 which are bounded at -1; the labels have nothing to do with the histograms; only the scatter plots. TMW just placed the x-axis labels for all the suplots at the bottom instead of keeping them with their respective suplot locations.
If create a poor-man's copy...
subplot(2,2,1)
hist(MCMC(:,1),100)
subplot(2,2,2)
scatter(MCMC(:,2),MCMC(:,1))
ylim([0 0.025])
xlim([-1.105 -0.7])
subplot(2,2,3)
scatter(MCMC(:,1),MCMC(:,2))
xlim([0 0.025])
ylim([-1.105 -0.7])
subplot(2,2,4)
hist(MCMC(:,2),100)
xlim([-1.05 -0.75])
one gets
so, while perhaps confusing, looks like the data are in fact correct...I don't have the Econometrics TB so can't go in and query what the actual limits are on each subplot() but doing so will make things clear, I expect. I fiddled around to roughly approximate the appearance on the LRH one...that took some doing...what the logic is that created the actual limits would be interesting to go look at, perhaps.
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JT Yang
JT Yang 2019-7-14
Hi, dpb. You are superb. I've never dive down so deep into plotting. Now I know how to get the xlim for all graphs. That will be helpful for get around.
dpb
dpb 2019-7-15
One additional note: The line for the diagonal axes that isn't shown is just the variable plotted against itself--the 'ii' case so it is simply a 45-degree line of the range of the variable. The just didn't bother to fix up the logic to not plot the i==j case but did all and then overwrote the diagonal with the histograms not bothering to delete() the extra axes/line.

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Amin Salehi
Amin Salehi 2023-12-7
编辑：Amin Salehi 2023-12-7
Yup, I see the same bug (different dataset) the histogram x-axis are wrong.

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