plot with error bars

Posted on 2008-11-18 23:21 By Jacob Moldenhauer (

11)

Categories:

How do I ...? with Maple

Download 4125_Testdata.txt
View file detailsI am trying to create a point plot from a data file, with the first two columns, x,y, and the third column as the error in y.

I can make the pointplot with the first two columns, but trying to add in the third colum for the Errorplot in statistics program is not working. Is there a way I can use this third column of my data file to be the yerrors= part of Errorplot command?

> restart;
> A := readdata("C:\\Documents and Settings\\Desktop\\Testdata.txt", 3);
[[1.14, 44.67, 0.3], [1.14, 44.4, 0.32], [1.23, 45.13, 0.24],

[1.23, 44.93, 0.21], [1.3, 45.02, 0.21], [1.305, 44.47, 0.31],

[1.34, 44.88, 0.32], [1.37, 45.19, 0.26], [1.39, 44.86, 0.2],

[1.755, 45.31, 0.36]]
> B := readdata("C:\\Documents and Settings\\Christine\\Desktop\\Testdata.txt", 2);
[[1.14, 44.67], [1.14, 44.4], [1.23, 45.13], [1.23, 44.93], [1.3, 45.02],

[1.305, 44.47], [1.34, 44.88], [1.37, 45.19], [1.39, 44.86], [1.755, 45.31]]
> (plots[pointplot])(B);

errorbar

Comment on 2008-11-18 23:51 from jakubi ( Maple Rating 4

943)

It is a command included in the Maple Advisor Database library.

An example, from errorbar help page:

errorbar([seq([i,i^2,10/i],i=1..10)]);

error bar

Comment on 2008-11-19 00:36 from Jacob Moldenhauer (

11)

<p>Yes, I had seen this in another post, but was not sure how to apply it to my list of data points and errors, or how to have it call my datafile for use.</p>

simple

Comment on 2008-11-19 01:39 from jakubi ( Maple Rating 4

943)

With the library installed:

A := [[1.14, 44.67, .3], [1.14, 44.4, .32], [1.23, 45.13, .24], 
[1.23, 44.93, .21], [1.3, 45.02, .21], [1.305, 44.47, .31], 
[1.34, 44.88, .32], [1.37, 45.19, .26], [1.39, 44.86, .2], 
[1.755, 45.31, .36]];
errorbar(A);

produces the plot.