Non-existing values in the Plot

Greetings. I'm having trouble with some code. This function should display a curve based on X and Y values loaded from a .txt file. For some reason, when it displays the curve it also draws a line in the Y axis. At first I thought I had a problem with the .txt, but i tried plotting it in excel and the curve appears as it should. Also, this does not happen with all the .txt files I'm working with.

Code

       function graph

      clc;

      set(0,'DefaultFigureColor','w',...
            'DefaultAxesColor','w',...
            'DefaultAxesXColor','k',...
            'DefaultAxesYColor','k',...
            'DefaultAxesZColor','k',...
            'DefaultTextColor','k',...
            'DefaultLineColor','k');

      x = load('try.txt');

      r1 = load('try.txt');
      r1 = r1(:,2);

      f1=figure(1); 
      clf;
      get(f1);
      set(f1,'Units','centimeters','Position',[3 3 24 14]);
      axes1 = axes('Parent',f1,'FontWeight','bold','FontSize',14,'Ygrid', 'on','grid', ':','Position',[0.15 0.2 0.8 0.7]);

      set(gcf,'Color',[1,1,1]);
      box on;
      hold on;

axis([0, 16,  0, 6e+06]);

plot(x, r1, '-g','LineWidth',2,'Marker','none', 'Markersize', 5);
hold on

end

This is what my code generates:

This is what excel draws (and what it should be):

Any ideas?

Answer 1

[the cyclist]

Your x variable is both columns of the input file, and r1 is only the second column.

I think you are unintentionally plotting both columns of the input against the second, when you intended to plot the first against the second. The following give what you want:

plot(x(:,1), r1, '-g','LineWidth',2,'Marker','none', 'Markersize', 5);

The following is even better, dispensing with your loading the file twice:

        clc;
        set(0,'DefaultFigureColor','w',...
              'DefaultAxesColor','w',...
              'DefaultAxesXColor','k',...
              'DefaultAxesYColor','k',...
              'DefaultAxesZColor','k',...
              'DefaultTextColor','k',...
              'DefaultLineColor','k');
        x = load('try.txt');
        f1=figure(1); 
        clf;
        get(f1);
        set(f1,'Units','centimeters','Position',[3 3 24 14]);
        axes1 = axes('Parent',f1,'FontWeight','bold','FontSize',14,'Ygrid', 'on','grid', ':','Position',[0.15 0.2 0.8 0.7]);
        set(gcf,'Color',[1,1,1]);
        box on;
        hold on;
  axis([0, 16,  0, 6e+06]);
  plot(x(:,1), x(:,2), '-g','LineWidth',2,'Marker','none', 'Markersize', 5);
  hold on

[Pedro]

Everything's works fine, now! Thank you for your help.