How can I add legend to graph with each loop for ezplot?

Question

Akshay Kumar 2016-9-16

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/303301-how-can-i-add-legend-to-graph-with-each-loop-for-ezplot

评论： Walter Roberson 2016-9-18

Hello,

I am plotting blending function of bezier curve, in which number of blending curve depends on the number of control points taken.

Now, my problem is I want to add legend for each graph(ezplot) which is plotted by running loop?

Please! help me.

Code is:

    %%Plotting of blending curve
   for i=1:length(b)
      ezplot(b(i),[min(u),max(u)])
      hold on
   end

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Answer 1

Walter Roberson 2016-9-16

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/303301-how-can-i-add-legend-to-graph-with-each-loop-for-ezplot#answer_235044

在 MATLAB Online 中打开

      %%Plotting of blending curve
   for i=1:length(b)
      h(i) = ezplot(b(i),[min(u),max(u)]);
      leg_entries{i} = sprintf('b = %g', b(i));
      hold on
   end
   legend(h, leg_entries)

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Akshay Kumar 2016-9-18

在 MATLAB Online 中打开

Thank you sir,

but when I applied the same code, it is not accepting as [b] is symbolic matrix.

if true
  % code
  %%Plotting of blending curve
 for i=1:length(b)
    h(i) = ezplot(b(i),[min(u),max(u)]);
    leg_entries{i} = sprintf('b = %g', b(i));
    hold on
 end
 legend(h, leg_entries)
((Error using sprintf
Function is not defined for 'sym' inputs.)) 
end