plot a single Error bars

Hi all,

I am trying to create one error bar but I am struggling a lot.

I tried to read the matlab documentation about error bars but the site is down for some reason.

Anyway, I have calculate the standard deviaiton (s=4.13) but I am confused witht the x,y axes

the x axis should be 1 value and the y axis has a range from 0 to 14

please let me know what you think

many thanks

Nikolas

[dpb]

Normally one can install the documentation locally on installation just as an aside...

Not sure from the description what you're trying to actually represent -- what's the x,y values for which to plot an errorbar?

Just

x=1; y=8.35;
sd=4.13;
errorbar(x,y,sd,'*')
ylim([0 14])
xticks([0:2])

will create a figure that would match the above description albeit relatively devoid of information being only a single point. But, if that's all one has, so be it...

[Nikolas Spiliopoulos]

ok thanks..However I don't understand what is y? is the mean value? Moreover, how I can get a bar instead of a star? sorry but I haven't used them before and I am a bit confused thanks again

[dpb]

Well, you must have an ordinate point which is the "y" as a minimum as well as an associated error value for any plot, the abscissa can be omitted in which case will be the ordinal number by default. errorbar is no different than plot in that regards.

You didn't provide any information other than a computed std deviation value; I just made up a pair of x,y values for the example that would fit into the ylim range you did indicate.

linespec is defined same as for plot, just add the triplet letters for marker, color, line as wanted.

[Adam Danz]

errorbar(x,y,neg,pos)

(x,y) are the coordinate you're adding the error bar to.

neg and pos the lower and upper length of the error bar.

so, this line

errorbar(3,4,1,2, 'o')

plots a point at (3,4) and the errorbar extens downward by 1 y-unit and upward by 2 y-units.

[Nikolas Spiliopoulos]

Alright, thanks a lot I am gonna have a look at website too!!

Answer 1

[Prabhan Purwar]

Hi,

Bar chart can be created by making use of bar and errorbar functions as shown in the following code.

x=1; y=8.35;
sd=4.13;
bar(x,y);
hold on
errorbar(x,y,sd)
ylim([0 14])
xticks([0:2])
hold off

Output:

Please refer the following link for further information on errorbarfunction

https://www.mathworks.com/help/matlab/creating_plots/bar-chart-with-error-bars.html?searchHighlight=error%20bar&s_tid=doc_srchtitle

Hope this helps

[dpb]

Ah! Maybe THAT was what OP mean by "how to get a bar instead of *"...I couldn't figure that one out and there was no further input.