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My plot does not start at 0

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aryan abedi
aryan abedi le 18 Juil 2017
I had to write this code, to plot an ecg trace, however, after writing I realized my graph does not start on the x axis. I tried to define limits for my axis but it still did not work. Also my graph does not fit the scale. I want the x axis ends right at the last point of my graph but that does not happen either. I was wondering if someone can help me.
  2 commentaires
MSP
MSP le 18 Juil 2017
Can you post the text file that you used
the cyclist
the cyclist le 18 Juil 2017
Modifié(e) : the cyclist le 18 Juil 2017
It's probably impossible to help you without seeing your data and/or code. Please post them.
Also, I deleted the first (nearly identical) question you posted.

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Réponses (3)

Image Analyst
Image Analyst le 18 Juil 2017
If you want your data to start from the x ("t") axis, so that only positive y ("v") are shown, and no negative y/v, then do this:
yl = ylim; % Get current limits.
ylim([0, yl(2)]); % Replace lower limit only with a y of 0.
If you want x/t to start at the y/volts axis, and end at the last t, do this:
xlim([0, t(end)]);
Do both of those after you've called plot(), not before.
  2 commentaires
aryan abedi
aryan abedi le 19 Juil 2017
Thanks for your help. xlim did work, but the Y one does not work, I have an ecg graph, which I detrend it and that is why it starts below the 0. If i define boundaries for y (the code you gave me) it cuts off the negative part of the ecg trace. Thanks again for your help on the xlim.
Image Analyst
Image Analyst le 19 Juil 2017
When you said " I realized my graph does not start on the x axis" I assumed you wanted the graph (the y axis) to start at the x axis (the horizontal line, the horizontal axis) and go upwards from there. What else could it mean? You can pass whatever values you want for the starting and stopping values of the y axis into ylim().

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dbmn
dbmn le 19 Juil 2017
The question is not really clear and multiple outcomes are possible. Maybe you could draw (into the image you posted, what you want it to look like)
% Move x axis around (I dont like how it looks, but maybe thats what you want)
ax = gca;
ax.XAxisLocation = 'origin';
% Other limits of y axis (basically copied from Image Analyst but tweaked a little bit)
yl = ylim;
ylim([min(y), max(y)]);

Harley Calvert
Harley Calvert le 21 Nov 2021
Modifié(e) : Harley Calvert le 21 Nov 2021
I had a problem like this and I just made a second plot going from 0 to the 1st point...
two = [0; one(1,1)];
plot(one)
plot(0:1, two)
You have to play with the line and colors etc to make it match.

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