change x axis, i have a plot of data from a headset. then i have 5 lines from a game, so i want 0-time from start(green) line till the end(red line), is it possible?

    plot(data(2:end,3),data(2:end,1));
    hold on;
    plot(data(2:end,3),data(2:end,2), 'k');
    plot([Start Start],[0 1], 'g');
    plot([mistake1 mistake1],[0 1], 'c');
    plot([mistake2 mistake2],[0 1], 'c');
    plot([mistake3 mistake3],[0 1], 'c');
    plot([mistake4 mistake4],[0 1], 'c');
    plot([End End],[0 1], 'r');

Answer 1

[pfb]

Not sure what your asking for.

Do you need to re-define the limits of your x-axis so that they go from the green to the red line? That would be

 xlim([start end]);

Or maybe you want that your scale be 0 at the green line... In that case you simply substract start from all the xdata in your plots. When plotting

 plot(data(2:end,3)-start,data(2:end,1));

and likewise for the others.

Otherwise, with focus on the axes containing your plots, like the figure you sent,

 % get the handles for the lines
 h = findobj(gca,'type','line','linestyle','-');
 % loop over the handles
 for j = 1:length(h)
   % translate the xdata
   set(h(j),'xdata',get(h(j),'xdata')-start);
 end

[sindre Røyland]

of course! plot(data(2:end,3)-start,data(2:end,1));, i was just stucked in some big ideas!

Thanks!

[pfb]

Not sure I understand even after your reply to Michael.

Translating all your xdata, as illustrated above, puts the origin at start.

The rest seems like a xticklabel or xtick matter.

If you do not translate, but insist on using your plot:

 set(gca,'xtick',[54 162],'xticklabel',[0 108]);

otherwise, if you translate, you just need

 set(gca,'xtick',[0 108]);

Because the ticklabels would coincide with the real tick positions. Personally, I'd prefer this.

Answer 2

[Michael Haderlein]

It's not quite clear what you want.

1) You want the x-axis to only go from the green line to the red line:

xlim(Start, End)

as you have named the respective values this way.

2) You want to get the data which lies in between the green and the red line for further processing:

partofthedata=data(data(:,3)>=Start & data(:,3)<=End,:);

Please note that the exclusion of the first row (you use data(2:end,...)) is not applied here. If this is a problem, first remove this row and then cut out the way I have shown here.

3) A comment on your variable naming: "End" is a very bad variable name. First, it's a keyword and second it has a special meaning as index (even though you have capitalized it - I wouldn't use it).

[sindre Røyland]

I want to keep the data before the green line aswell, and after. So i want this to be blank, and then the 0 axis starts at the green line and the runtime is at the red line. so the green line start at 54 and the red one at 162. 54 = 0, and 162 = 108. And the rest is blank

Ya i know end is a bad word here, but doing it in norwegian and needed to change it quickly

Thanks! and hope that this explain my situation

[pfb]

 xlim(Start, End)

would produce an error, though. The limits should be in a vector, at least up to R2012b.

xlim([Start, End])

I agree on avoiding the name End for a variable. Did not spot that.

[Michael Haderlein]

Oops, thanks for correcting me. Of course it's supposed to be an array. Anyway, guess the issue is already solved.