Weird vertical lines with plot function
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Dear all,
While trying to plot a specific dataset, I encouter a weird behavior:
load elpenon
figure; scatter(elpenon(:,1)*1000,elpenon(:,3),10,'k')
gives the appropriate plot
However, when calling :
figure; plot(elpenon(:,1)*1000,elpenon(:,3))
I obtain this :
These weird vertical lines appears. No data support this as shown in the scatter plot.
max(elpenon(:,3))=-1.3800
so nothing above 0 but stil shown in the plot
changing linejoin properties does not solve the issue. The plot although is correct when setting linewidth to .1.
When using the pan tool in the figure window to move the plot around, the vertical lines diseappear when the origin of the extra line is outside of the x and y lims.
Can anyone explain this and propose a workaround?
Thanks
8 个评论
What OS ?
version
S = load('elpenon.mat')
M = S.elpenon
scatter(M(:,1)*1000,M(:,3),10,'k')
plot(M(:,1)*1000,M(:,3))
Olivier
2026-5-22，13:09
Walter Roberson
2026-5-22，18:47
Datapoint:
I obtain normal plots with R2025b on MacOS Intel Tahoe 26.5
Olivier
2026-5-27，7:18
Contact support:
They can open a remote session on your computer and have a better chance to find what the problem is.
Do you have an Apple Silicon Mac or an Intel-based Mac ?
Olivier
2026-5-28，6:43
Apple silicon.
It may be or not related but I now have weird lines within contour plot that used to work fine in a previous laptop.
I will try the support! Thanks for your help
Olivier
2026-5-28，8:37
回答（2 个）
Euhanne Reign
2026-6-2，15:20
0 个投票
hi good evening. when you have data at the same x value your concurrent value corresponding to differtiating y values will possibly make a spike since there might or might not be data in one subposition or nan position to the data corresponding to the chart. Which sets the value to negatives or higher than the data that is given, the only way for this problem is to fix the data manually at that certain point or fix the value of the chart data, that would fix the spike output in the output. This could also be fixed to downgrading to older version since some versions of matlab have the advantages on canceling out nan data(bugged data) please correct me if im wrong thank you have a good time!
3 个评论
load elpenon
min(elpenon(:,3))
max(elpenon(:,3))
find(~isfinite(elpenon(:,3)))
figure(1)
x = elpenon(:,1)*1000;
plot(x, elpenon(:,3))
figure(2);
mask = x >= 2e4 & x <= 2.5e4;
plot(x(mask), elpenon(mask,3))
You can see from this that there are no spikes in the data, and no non-finite values.
Euhanne Reign
2026-6-2，16:36
good evening thank you for correcting me walter robinson I highly appreciate your feedback!
Euhanne Reign
2026-6-2，16:37
编辑：Euhanne Reign
2026-6-2，16:39
it’s a high disregard of my mistake of thinking its a chart non finite number error but and mistake of not checking it first in the plot thank you very much once again!
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2026-6-2，16:39
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