Legend - for plots in if condition

Question

Meera 2015-6-30

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/225869-legend-for-plots-in-if-condition

评论： Jan 2015-7-4

for j = 1:laenge4(1,2)
if isempty(TempVolt(j).data) == true;
else
x_axes = volt_data(:,1);
y_axes = time_data(:,2);
if volt_data(1)== 7
  a1 = plot(x_axes,y_axes,'bs','DisplayName','@7V');     
  hold on;
  end       
if volt_data(1)== 13.5
 a2 = plot(x_axes,y_axes,'gs','DisplayName','@13.5V');
hold on;
end
if volt_data(1)== 18
 a3 = plot(x_axes,y_axes,'ks','DisplayName','@18V');
 hold on;
end
end
end
l = legend('show')
set(l, 'Interpreter','none');

But I want to display all 3 legends even if the plots a2 and a3 are not plotted. Can anyone please help me. Becoz in for loop for other values of 'i' a2 or a3 can be plotted.

Please help me

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Answer 1

Jan 2015-6-30

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/225869-legend-for-plots-in-if-condition#answer_184516

在 MATLAB Online 中打开

What about setting the visibility?

for j = 1:laenge4(1,2)
  if ~isempty(TempVolt(j).data)
    x_axes = volt_data(:,1);
    y_axes = time_data(:,2);
    a1 = plot(x_axes,y_axes,'bs','DisplayName','@7V', ...
              'Visible', OnOffStr(volt_data(1) == 7));
    hold on;
    a2 = plot(x_axes,y_axes,'gs','DisplayName','@13.5V', ...
              'Visible', OnOffStr(volt_data(1)== 13.5));
    a3 = plot(x_axes,y_axes,'ks','DisplayName','@18V', ...
              'Visible', OnOffStr(volt_data(1)== 18));
  end
end
function S = OnOffStr(V)
if V
  S = 'on';
else
  S = 'off';
end

Does this works or do invisible line vanish from the legend?

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Meera 2015-6-30

Hello Jan Simon,

I got the following error 'Function definition is misplaced or improperly nested.' can we use the statement 'function' in the middle of the program.?

Thanking you. Meera

Jan 2015-7-4

Function definitions are allowed inside function M-files, not in scripts and not in the command window. So either create a new file called OnOffStr.m and store it in a user-defined folder inside your Matlab path. Or append teh definition of the function to your function file. If you use a script currently, think of converting it to a function.

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