LV 2009 error bar plots suggestions

I have mentioned my mixed feelings about the new error bar plot introduced in 2009 on the info-labview list and have been asked to move this discussion to this forum.
So there it goes:
Introducing the possibility to natively display plots with error bars associated with each data point is a nice touch that brings LV one step closer to being a full-fledged data analysis and representation environment. However, the feature is limited in allowing only a single axis error bar (and on the Y axis only). This might come from NI's hardware bias (time recording of waveforms, in which the time axis does not have any "error" to it, being clock driven). Some of us use LV for a tad more than just recording waveforms and displaying them. We use complex instruments, process our data extensively, and when times come to plot a XY graph (and this is true for higher dimensionality data too), each coordinate (X, Y, etc) of each data point may be affected by a statistical or experimental uncertainty.
In this kind of situation, each data point should be represented as a center point with two orthogonal error bars (with different sizes, and possibly, as offered in the new error plot, different plus and minus error bars). In most cases, the plus and minus error bars will be identical (representing the standard deviation of the data), so it would be advantageous to have an option that allows specifying that and avoid passing twice the same array of error bars to the plot formatting VI.
Note that introducing this feature wouldautomatically bring up the request to have fitting algorithms that take this kind of dual axis error bar representation into account (which most data analysis software do nowaday).
I hope this brief suggestion will be supported by other fellow LabViewers...
X.

All,
These are great suggestions, and we always enjoy getting feedback from real-world situations where LabVIEW could help out more. I really think this should be thrown on the LabVIEW Idea Exchange. Our development team looks over all the suggestions there, and it would have much more visibility than just being posted in this thread.
Also, while you are there, be sure to vote on ideas that you like! Some of the top ideas are so obvious, you will be surprised they weren't implemented already!
Rob K
Measurements Mechanical Engineer (C-Series, USB X-Series)
National Instruments
CompactRIO Developers Guide
CompactRIO Out of the Box Video

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PLEASE READ THE ENTIRE POST and HELP!
Please help with this VI and make it an instructive example for me and other novices like me who come across this typical example.
A typical problem in plotting data is as follows: On the SAME plot (Y-axis = Amplitude vs. X-axis = Time), plot the curves Amp1, Amp2, Amp3, ... coming from sample1, sample2, sample3, ...
Furthermore, there is Error1, Error2, Error3, ... associated with Amp1, Amp2, Amp3,...., which also needs to be plotted. In order to distinguish between these curves, one may use different
colors and show a legend that reads Amp1 (say black), Amp2 (say red), and Amp3 (say green). The plot then becomes complete and conveys data very conveniently.
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I don't want to see the default Plot 0, Plot 1, or whatever. Also, it would be nice to dynamically control the symbol, color, curve style etc, as we keep adding more and more curves to the plot.
Once this problem is fixed, I know I can easily extend it to make it plot more than just two curves in a dynamic way. I could use for loops with shift registers, etc to plot any number of curves on a single plot.
Believe me, I have searched for other posts and cannot find a simple example like the one I have posted here. Many examples I found have confused me more than helped me.
I believe that if this problem is solved in a simple way, many others will find this example very instructive. So by helping me, you help many other people as well!
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Solved!
Go to Solution.
Attachments:
Multi_Plot_Legend_Error_Bar.vi ‏24 KB
data.txt ‏2 KB

Some members have pointed out that this problem has already been resolved (see the link below).
http://forums.ni.com/t5/LabVIEW/Dinamically-handle-legend-names-using-property-nodes/td-p/1479572
I did verify that this works for XY Graph, but not for 2D Error Plot.
I need both legend and error bars. Shame on LabVIEW for not making such a basic plotting requirement easy and trasparent.
There are many clever people who can find work arounds, but that is a not a correct approach.

How Do I fix a -2009 error on IMovie

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I recieved an error message while trying to export a movie project from IMovie to my desktop. The error read: Unable to prepare project for publishing. The project could not be prepared for publishing because of an error occuring (-2009).
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I compiled all the -2009 error messages in the Discussion Board just this past Summer. And this is the summary of what I found. If this happens again, go ahead and try out some of the suggestions:
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Angelos,
I'm sure that your eyes are sharper than mine. Still, if your error bar is shorter than the radius of your symbol, you aren't going to see it. The standard symbols are roughly 4mm in diameter, based on the Numbers Rulers. Let's say you have a 100 mm tall chart, an average graphic size. A 0.5% error bar would be a maximum of 0.5 mm in length, unless you suppress the axis zero, and would be hidden behind the 4 mm dia. data symbol. Yes, you could see a 3% or 4% error bar, but I'm not sure everyone would recognize that it was an error bar and not part of the data symbol.
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Legend, error bars, 2nd y axis etc

Hello all,
Measurement Studio is a powerful program. But it's graphing functions need improvement. As a scientific tool, for example, the lack of plotting error bars in CWGraph is unforgivable. And many other essential functions for producing decent graphs are missing. So I attempted to try to fill in some gaps. The attached program intends to do following:
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P.S.
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Attachments:
plottest.zip ‏6 KB

Thanks for sharing this with us Girit. I'm sure this will help out alot of people on the forum.
For your legend, this document provides another way you might be able to create a legend and not have to deal with finding an empty place on the graph.
Thanks again
Bilal Durrani
NI

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It seems that you missed something.
In the Pages User Guide we may read:
*+Updating a Chart Copied from a Numbers Document+*
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Cannot define error bars for individual bars, has to be whole series

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I can't do this. This is a fatal flaw in the software, and again, forces me to use a different application. Please tell me I'm doing something wrong! I love Numbers!
Photo:
http://web.me.com/toddknutson/errorbars2.png
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I solved my own problem!!
If you want to set different error bar values for every bar in your graph:
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See picture!
http://web.me.com/toddknutson/errorbars3.png

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Hi Jim,
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Jerry

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I don't see that this functionality or this kind of chart exists in CR.
I would suggest that you log an Enhancement Request at http://ideas.sap.com and let our developers look into this.
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Error bar problem

This must be simple, but I can't figure out how to make either a standard deviation or a standard error bar to a chart.
I place the numbers 22, 33, 44 in three adjacent cells. I highlight them and see average in the lower left area. I drag this average button to a new cell, and viola the cell says 33. I click the cell and click chart and make a bar chart and get a chart that has a bar at 33. I then click the inspector and under advanced click error bars and positive and negative. For fixed value it works fine. For standard deviation or standard error, the error bar does not exist?!! How do I use the std dev or std error buttons to generate the appropriate error bar?
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Please help,
Paul

Thank-you Yvan for your continued support. I have been working on this as well and spent some time with a VERY receptive and helpful Apple specialist, Chris. Indeed, what I was looking for was a chart like Yvan posted as Graphique 6. A version I created is here (hopefully I've got this image insert working:
image: !http://picasaweb.google.com/lh/photo/HeCHRLWhs3C79ewObd_TdA?feat=directlink!
I made the error bars by using a formula to generate the standard deviation:
image: !http://picasaweb.google.com/lh/photo/FnKGk70HlsKmn38cYPYQFw?feat=directlink!
Then generated custom error bars with that cell:
image: !http://picasaweb.google.com/lh/photo/5IQm4ncUiq-Q9R8H2bb3zQ?feat=directlink!
I just discovered that Excel implements the one-click error bars identically to Numbers. It is counterintuitive (to me and my coworkers who have listened to my ranting today) that the one click standard error or standard deviation buttons would not give the standard deviation or standard error plots on the average bar, rather than on a series of bars, as if they were independent data. Here is one of countless examples of data from peer reviewed scientific literature of how this type of plot is (and IMHO should be) used:
image: !http://picasaweb.google.com/lh/photo/5IQm4ncUiq-Q9R8H2bb3zQ?feat=directlink!
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Hi Saurabh614,
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