shouldPlot and switch case and legend and multiple figure error

Question

Meva 2015-3-5

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/181661-shouldplot-and-switch-case-and-legend-and-multiple-figure-error

评论： Meva 2015-3-5

Two questions about shouldPlot and switchcase:

1) I cannot locate correctly legends I mean it does not show legends for figure (1) 2) Figure (2) cannot be shown. I can usse another swicthcase but I do not want to overwrite.

   shouldPlot = true;
      switch nt
          case 1
              f = up;     g = down; 
              c = middle;
              vel1 = u1;  vel2 = u2;
              hold on;
          case 2
              f = up;     g = down;  
              c = middle;
              vel1 = u1;  vel2 = u2;
          otherwise
              shouldPlot = false;
              %               disp('Quit');
      end
      if (shouldPlot)
          figure (1);
          plot(xx,f,xx,g);
          legend('time 0','time 0','t clash','t clash')
          hold on;
          plot(xx, c);
  %         legend('time 0','t clash')
          hold on
  %         axis([0 1 0 1]);
          xlabel('x');
          ylabel('body');
          figure (2);
          plot(xx,vel1,xx,vel2);
          ...
        end

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Answer 1

Michael Haderlein 2015-3-5

1
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https://ww2.mathworks.cn/matlabcentral/answers/181661-shouldplot-and-switch-case-and-legend-and-multiple-figure-error#answer_170174

When I run the code inside your if case with random values, I do get the legend in figure 1. Of course, only f and g are described, but that's all which is plotted at the time the legend is created. Depending on the size of f and g, the legend either includes only "time 0" twice or also "t clash". c is not included in the legend as you plot c after the creation of the legend. Remember that the legend will be fully rewritten when you use the legend command. Old entries will disappear if you do not repeat them.

What do you mean with "Figure (2) cannot be shown."? Figure 2 is created and shows up just as it should.

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Meva 2015-3-5

在 MATLAB Online 中打开

legend certainly does not work.. I have used :

   shouldPlot = true;
        switch nt
            case 1
            ...
            case 2
            ...
            otherwise
                shouldPlot = false;
                ...
        end
         if (shouldPlot)
            figure (1);
            plot(xx,f,xx,g);
            hold on;
            plot(xx, c);
            legend('for f case1','for g case1','or f case2', 
            'for g case2','for c case 1','for c case2')
            hold on
            xlabel('...');
            ylabel('...');
            figure (2);
            plot(xx,vel1,xx,vel2);
            ...
          end