Start plot errorbar() at 0 ?

2015 4 27
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更新时间：2015 4 28
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0 个投票

Hello,
In my matlab script, i use errorbar() to plot my data, but i wish it could start from 0 (for the y-axis).
Do you have an idea ?
Thanks !
Here is my sample :
>> x
moyenne(2:2,1:end)
ste(1:1,1:end)
x =
1 2
ans =
64.7573 36.0701
ans =
4.0268 4.6105
>> errorbar(x,moyenne(2:2,1:end),ste(1:1,1:end));

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Jos (10584)
Jos (10584) 2015-4-27

0 个投票

You can change limits of the axis using the commands YLIM
CurYLim = ylim % get the current Y limits
ylim([0 CurYlim(2)]) % change the lower limit

更多回答（1 个）

Remi Chaussenot
Remi Chaussenot 2015-4-27

0 个投票

Thanks for your quick answer.
In the mean time, i ended with :
oldy = get(gca, 'ylim')
if oldy(1) > '0'
oldy = [0 oldy(2)]
end
set(gca,'YLim',[0 oldy(2)])
Which one is better ?
Thanks :)

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Michael Haderlein
Michael Haderlein 2015-4-27
First, please note that the '' in your if statement are making things wrong. You actually compare the lower limit with the string '0'. This means, the value of the ascii sign '0' will be used which is 48. So you set oldy(1) to zero only if it was at least 49 before. That's not what you wanted, I guess.
However, your code works because the if structure makes nothing at all. The reason is that you don't even use the value of oldy(1) in your set statement. So you can simply delete the entire if statement. What you then end up with is basically the same as Jos' answer. If you use ylim() or set(handle,'ylim',..) is up to you.
Remi Chaussenot
Remi Chaussenot 2015-4-28
编辑：Remi Chaussenot 2015-4-28
Hello,
I had some difficulties to understand your message yesterday, so i reply just today.
"You actually compare the lower limit with the string '0'. This means, the value of the ascii sign '0' will be used which is 48. So you set oldy(1) to zero only if it was at least 49 before. That's not what you wanted, I guess."
No, you guess well. I do not know that it use the ascii value with ' ' (well, started with MATLAB a few weeks ago, more used at PHP/JS...).
"The reason is that you don't even use the value of oldy(1) in your set statement. So you can simply delete the entire if statement."
Damned, i just read my code today. Yeah, the if statement is truly useless, because the set is outside ! Was very tired yesterday..
Thanks for opening my eyes Michael :)
Edited like that :
CurYLim = ylim
if CurYLim(1) > 0
ylim([0 CurYLim(2)])
end
Seems okay ? Thanks Michael and Jos :-)

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