Plots and legend don't match

Question

Mihir Tasgaonkar 2022-6-27

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1748745-plots-and-legend-don-t-match

评论： Mihir Tasgaonkar 2022-6-28

采纳的回答： dpb

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Hi,

I have a FOR loop where I'm plotting two different graphs. I'm then specifying the legend entries outside the loop.

for jj=1:5
  plot(app.AccTabTorqueProfile,app.Motor.(sprintf('SR%d',jj)).RPM, app.Motor.(sprintf('SR%d',jj)).Torque, app.Motor.(sprintf('SR%d',jj)).RPM, app.Motor.(sprintf('SR%d',jj)).Torque*-app.const.mot.regen_trq_fac,"Color",C{jj});
  hold(app.AccTabTorqueProfile, 'on');
  drawnow;
  plot(app.AccTabPowerProfile,app.Motor.(sprintf('SR%d',ii)).RPM,app.Motor.(sprintf('SR%d',ii)).PWR/1000,app.Motor.(sprintf('SR%d',ii)).RPM,app.Motor.(sprintf('SR%d',ii)).PWR*-app.const.mot.regen_trq_fac/1000,"Color",C{ii});
  hold(app.AccTabPowerProfile, 'on');
  drawnow;
end
legend(app.AccTabTorqueProfile,"SR1","SR2","SR3","SR4","SR5");
legend(app.AccTabPowerProfile,"SR1","SR2","SR3","SR4","SR5");
                

This code gives the same colours to "SR1" and "SR2", same for "SR3" and "SR4", and a third color for "SR5". Can someone help me plot the same colors in the legend as well?

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Walter Roberson 2022-6-27

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                    plot(app.AccTabPowerProfile,app.Motor.(sprintf('SR%d',ii)).RPM,app.Motor.(sprintf('SR%d',ii)).PWR/1000,app.Motor.(sprintf('SR%d',ii)).RPM,app.Motor.(sprintf('SR%d',ii)).PWR*-app.const.mot.regen_trq_fac/1000,"Color",C{ii});

Is there a relationship between ii used to index here, compared to the jj that you are looping over ?

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Answer 1

dpb 2022-6-27

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1748745-plots-and-legend-don-t-match#answer_994500

编辑：dpb 2022-6-27

在 MATLAB Online 中打开

Besides Walter's note that you're using ii in the second plot instead of jj,it would be cleaner/simpler to do something like

for jj=1:5
  vname="SR"+jj;        % use string class overloaded plus operator 
  plot(app.AccTabTorqueProfile, ...
       app.Motor.(vname).RPM, app.Motor.(vname).Torque, ...
       app.Motor.(vname).RPM, app.Motor.(vname).Torque*-app.const.mot.regen_trq_fac,...
       "Color",C{jj},'DisplayName',vname);
  if jj==1,;hold(app.AccTabTorqueProfile, 'on');end
  drawnow;
  plot(app.AccTabPowerProfile, ...
       app.Motor.(vname).RPM,app.Motor.(vname).PWR/1000, ...
       app.Motor.(vname).RPM,app.Motor.(vname).PWR*-app.const.mot.regen_trq_fac/1000, ...
       "Color",C{jj},'DisplayName',vname);
  if jj==1,;hold(app.AccTabPowerProfile, 'on');end
  drawnow;
end

where I've also assumed the ii was a typo and changed it to jj

Making that change alone would undoubtedly fix the problem by making them consistent usage of color (not to mention fixing up the data to not be the same for all for the second plot since ii isn't varying in the above code).