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Cell array for legend in a plot loop

Asked by Romain Liechti on 7 Jun 2019
Latest activity Commented on by Romain Liechti on 7 Jun 2019
I've built a function to plot a structure of idfrd, that use the fieldnames of the structure as legend for the curves. Everything works fine so far but I got a warning when I'm using the cell array for legend in the loop. 'Warning: Ignoring extra legend entries.' How can I get rid of this?
% Get field names as a cell array
names = fieldnames(Struct);
% Declare the cell array for legend
LegendCell = cell(length(names),1);
% Create the cell array containing the name of the fields for the legend
for jj = 1:length(names)
LegendCell{jj} = names{jj};
LegendCell{jj} = strrep(LegendCell{jj},'_',' '); % replace underscore by space
end
for ii = 1:length(fieldnames(Struct))
[mag,pha,~] = bode(Struct.(names{ii}),f_ax*2*pi);
figure(1)
subplot(211)
semilogx(f_ax,20*log10(squeeze(mag)),'linewidth',2)
hold on
l = legend(LegendCell{ii},'Location','southwest');
set(l,'FontSize',12,'FontName','Helvetica');
end

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R2018b

1 Answer

Answer by Alex Mcaulley on 7 Jun 2019
 Accepted Answer

Putting the legend call out of the loop:
% Get field names as a cell array
names = fieldnames(Struct);
% Declare the cell array for legend
LegendCell = cell(length(names),1);
% Create the cell array containing the name of the fields for the legend
for jj = 1:length(names)
LegendCell{jj} = names{jj};
LegendCell{jj} = strrep(LegendCell{jj},'_',' '); % replace underscore by space
end
for ii = 1:length(fieldnames(Struct))
[mag,pha,~] = bode(Struct.(names{ii}),f_ax*2*pi);
figure(1)
subplot(211)
semilogx(f_ax,20*log10(squeeze(mag)),'linewidth',2)
hold on
end
l = legend(LegendCell,'Location','southwest');
set(l,'FontSize',12,'FontName','Helvetica');

  1 Comment

Thanks, this works just fine.

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