legend() has an issue with 'Selected' or 'selected'

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Sulaymon Eshkabilov
评论： Sulaymon Eshkabilov 2021-2-20
The command legend() has an issue with 'Selected' as a legend name.
E.g.:
t = -13:13;
A = t*2-3*t;
B = A(A>0);
figure
plot(t, A, 'r-'), hold on
ts = t(A>0);
plot(ts, B, 'ko'), grid on
legend('All data', 'selected')
The above code prompts the following error:
Error using legend (line 272)
Mismatched number of name-value pair arguments. Specify a property
value for each property name.
Error in Untitled8 (line 8)
legend('All data', 'selected')
---
Any comments or suggestions how to address this issue is appreciated.
Thank you.

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采纳的回答

Cris LaPierre
Cris LaPierre 2021-2-20
编辑：Cris LaPierre 2021-2-20
Ran in:
The problem here is that 'selected' is being interpreted as the name of a name-value pair.
Change you legend labels to a cell array of character vectors to remove the ambiguity.
t = -13:13;
A = t*2-3*t;
B = A(A>0);
figure
plot(t, A, 'r-'), hold on
ts = t(A>0);
plot(ts, B, 'ko'), grid on
legend({'All data', 'selected'})
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Steven Lord
Steven Lord 2021-2-20
Ran in:
Another way to handle this is to set the DisplayName property of the objects that you want to appear in the legend.
% Make some sample data
x = 0:360;
y1 = sind(x);
y2 = cosd(x);
% Set up the axes
axis([0 360 -1 1])
hold on
% Plot
plot(x, y1, 'ro-', 'MarkerIndices', 1:30:numel(x), 'DisplayName', 'Selected')
plot(x, y2, 'kx--', 'MarkerIndices', 15:30:numel(x), 'DisplayName', 'MarkerIndices')
% Show the legend
legend show
I set the MarkerIndices property as well so I could show a subset of the points that were plotted as markers. Even though that's a property of the plotted line I could still use it as the DisplayName.

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