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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?

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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');

Accepted Answer

pfb
pfb on 29 Apr 2015
Edited: pfb on 29 Apr 2015
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
  2 Comments
pfb
pfb on 29 Apr 2015
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.

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More Answers (1)

Michael Haderlein
Michael Haderlein on 29 Apr 2015
Edited: Michael Haderlein on 29 Apr 2015
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).
  3 Comments
Michael Haderlein
Michael Haderlein on 4 May 2015
Oops, thanks for correcting me. Of course it's supposed to be an array. Anyway, guess the issue is already solved.

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