plot legend shows wrong linespec

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William Rose
William Rose 2024-4-15
评论： William Rose 2024-4-16
Ran in:
Starting with no open figures, and some data already computed, I made a plot as follows:
load('data') % I did not use this commands initially. It is here for demonstration.
figure
plot(t,molTot,'-rx',t,molGas,'-bo');
legend('a','b')
and I got a plot like the plot above, including the incorrect lines in the legend.
I had previously seen this problem in multi-panel plots made by a complicated script. I looked in the figure properties and saw nothing obvious, but I'm not a figure property expert, so I don't know exactly what to look for. Therefore I closed all open figures, before issuing the three commands above (without the 'load(...)') - to see if the bad legend occurred with a new and simpler figure. And it did. I closed the figure shown above, then repeated the three commands above, with the same result. Therefore I saved variables t, molTot, molGas in file data.mat. Then I closed and restarted Matlab. I did
load('data')
figure
plot(t,molTot,'-rx',t,molGas,'-bo');
legend('a','b')
and I got asnother figure with an incorrect linespec in the legend, as seen above.
Why is this happening? [Matlab 2023b on Windows 11 Pro.]
Thanks.

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采纳的回答

VBBV
VBBV 2024-4-16
Ran in:
d = load('data.mat')
d = struct with fields:
molGas: [401x1 double] molTot: 3.6118 t: [401x1 double]
%figure
plot(d.t,repmat(d.molTot,length(d.t),1),'-rx',d.t,d.molGas,'-bo');
legend('a','b')

更多回答（1 个）

the cyclist
the cyclist 2024-4-16
Ran in:
The syntax you are using created a plot with 402 "lines". The first 401 are red, and the last one is blue.
load('data') % I did not use this commands initially. It is here for demonstration.
figure
h = plot(t,molTot,'-rx',t,molGas,'-bo');
legend('a','b')
size(h)
ans = 1x2
402 1
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
You presumably intended something more like
figure
h = plot(t,molTot*ones(size(t)),'-rx',t,molGas,'-bo');
legend('a','b')

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