Legend and for loops

Question

Elduderino 2016-2-17

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/268646-legend-and-for-loops

编辑： Elduderino 2016-2-17

Hey, I am trying to evaluate some data and show it in a graph consisting of 3 sets each containg Mean values, x-errorbars and a fit function (See picture). But I am only able to get a part of the legend showing the right color for the last itteration or I get the whole legend but the color of my 'mean values' is set to that of the last itteration (symbol is ok). I tried numerus approaches but nothing seems to work. My latest try is this code ():

for (3 times itteration)...... other stuff goin on.....

[h,hh]= errorbar_x_one(eval_complete(2,:),eval_complete(1,:),eval_complete(3,:)); %errorbar_x_one outputs handle of errorbar and handle of scatter
y_loudness_function = loudness_function(x_achse,eval_line_point);%loudness function fit
hhh = plot(x_achse,y_loudness_function,[col_sym.col{col_sym.xxx} ':']);
grid on
col_sym.xxx = col_sym.xxx+1;
h.DisplayName = 'Errorbar';
hh.DisplayName = ['Mean ' condition{col_sym.xxx}] ;
hhh.DisplayName = 'fit';

end

legend([h hh hhh],'Location','NW')

Any help would be greatly appreciated.

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Answer 1

Mike Garrity 2016-2-17

1
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https://ww2.mathworks.cn/matlabcentral/answers/268646-legend-and-for-loops#answer_210201

在 MATLAB Online 中打开

You're saying you call

legend([h hh hhh], ...)

each time around the loop? That means that each time you're telling legend to forget about the items from the previous iteration and focus on these 3 new objects.

You'll want to move legend out of the loop. You could do something like this:

g = gobjects(1,9);
for i=1:3
  [h, hh] = errorbar_x_one( ...
  hhh = plot( ...
  g(end+1) = h;
  g(end+1) = hh;
  g(end+1) = hhh;
end
legend(g)

But if you're really putting everything into the legend, then you don't need to give it the handles. So you may be able to do something as simple as this:

for i=1:3
  [h, hh] = errorbar_x_one( ...
  hhh = plot( ...
end
legend show

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Mike Garrity 2016-2-17

The incorrect color sounds like this known bug:

problem with individual colour display in legend for scatter plot 2014b

Elduderino 2016-2-17

编辑：Elduderino 2016-2-17

Hey,

thanks for that info! I was thinking it might be the fact that the handle of the scatter plot has no color field. But this feature seems to be what I am experiencing.

Btw. do I understand this correct that the workaround's idea is to define a color pattern in advance and then pass that info in the legend?

edit: I used line plot instead...

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