skip items in a legend

Question

Luca Re 2023-7-22

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1999463-skip-items-in-a-legend

评论： Star Strider 2023-7-23

采纳的回答： Star Strider

i see this post

https://it.mathworks.com/matlabcentral/answers/406-how-do-i-skip-items-in-a-legend

but i don't understan how resolve it

i don't want visualize 'str2' in legend

str1='A';

str2='';

str3='C';

legend(str1,str2,str3,'Location','northwest')

Warning: Ignoring extra legend entries.

> In legend>process_inputs (line 592)

In legend>make_legend (line 319)

In legend (line 263)

In Predator_grafici_Struct (line 67)

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Answer 1

Star Strider 2023-7-22

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1999463-skip-items-in-a-legend#answer_1277153

在 MATLAB Online 中打开

Perhaps this —

x = 0:10;

y1 = randn(size(x));

y2 = randn(size(x));

y3 = randn(size(x));

figure

hp1 = plot(x, y1, 'DisplayName','A');

hold on

hp2 = plot(x, y2, 'DisplayName','B');

hp3 = plot(x, y3, 'DisplayName','C');

hold off

grid

legend([hp1 hp3], 'Location','best')

.

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Star Strider 2023-7-23

在 MATLAB Online 中打开

@Luca Re — This error:

Unrecognized function or variable 'hp1'.

appears because the first plot is only executed if ‘Set.ShowOne’ is true, so if that condition is not met, ‘hp1’ will not be created.

One approach to fixing that would be to set ‘hp1’ and ‘hp3’ (since it also will only be executed if ‘Set.ShowUnfiltered’ is true) to empty values first —

x = 0:10;

y1 = randn(size(x));

y2 = randn(size(x));

y3 = randn(size(x));

hp1 = [];

hp3 = [];

Set.ShowOne = 0;

Set.ShowUnfiltered = 1;

figure

if Set.ShowOne

hp1 = plot(x, y1, 'DisplayName','A');

end

hold on

hp2 = plot(x, y2, 'DisplayName','B');

if Set.ShowUnfiltered

hp3 = plot(x, y3, 'DisplayName','C');

end

hold off

grid

legend([hp1 hp2 hp3], 'Location','best')

This does not plot ‘hp1’ because the condition ‘Set.ShowOne’ is not met, and because ‘hp1’ has already been defined as ‘empty’, the error you got is not thrown in this code example. The third plot that creates ‘hp3’ plots and shows in the legend because ‘Set.ShowUnfiltered’ is true, and ‘hp3’ over-writes the previously set ‘empty’ value, so it appears in the legend call.

.

Luca Re 2023-7-23