Color matching legend with variable number of data sets

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Edward 2014-8-25

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https://ww2.mathworks.cn/matlabcentral/answers/152287-color-matching-legend-with-variable-number-of-data-sets

评论： Salaheddin Hosseinzadeh 2014-8-25

I am attempting to create a legend for a variable (input) number of data sets. These data sets are plotted point-by-point because I need to be able to run an animation (showing the orbits of planetary bodies). This is what I have so far:

Legend=cell(N,1);
figure(1)
hold all
for k=1:N
    for i=1:length(t1)-1
        h_plot(k,i)=plot3([rplot(i,6*k-5); rplot(i+1,6*k-5)],[rplot(i,6*k-4),rplot(i+1,6*k-4)],[rplot(i,6*k-3),rplot(i+1,6*k-3)],'.','Color',ColorSpace(k,:));
      end
      Legend{k}=legend(strcat('Body ', num2str(k)));
  end
  xlabel('x position')
  ylabel('y position')
  zlabel('z position')
  legend(h_plot,Legend)

I thought I could have one variable h_plot be a plot handler and Legend be a list of the body names (their index #). Then I combine the two variables into one legend() command.

I get this error output:

"Operands to the and && operators must be convertible to logical scalar values.

Error in legend (line 198) elseif narg > 0 && ~ischar(varargin{1}) && ..."

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Edward 2014-8-25

在 MATLAB Online 中打开

I actually solved the problem, but I will leave this up as an example for anyone else facing similar problems. The updated functional code is:

Legend=cell(N,1);
figure(1)
hold all
for k=1:N
    for i=1:length(t1)-1
        h_plot(k,i)=plot3([rplot(i,6*k-5); rplot(i+1,6*k-5)],[rplot(i,6*k-4),rplot(i+1,6*k-4)],[rplot(i,6*k-3),rplot(i+1,6*k-3)],'.','Color',ColorSpace(k,:));
      end
          %Legend{k}=legend(strcat('Body ', num2str(k)));
          Legend{k}=strcat('Body ', num2str(k));
  end
  xlabel('x position')
  ylabel('y position')
  zlabel('z position')
  legend( h_plot(:,1) ,Legend)

I changed Legend to be a list of strings instead of legend handlers. I also modified the legend() command right above to refer specifically to the plot handler indexes.