Multiple Plots in a single graph

[Medhi]

Hi Friends,

I have a data file of five coloumns. I know how to get a multiple plot in XY graph with first coloumn in the X axis, and rest of the coloumns in the Y axis. I did it using read spreadsheet file, index array, bundle and finally build array. So I have five plots with the same X value but with different Y value. 

Now here is something different I want to do.

I save the data from another vi. and that vi has an input parameter (actually the iteration of a while loop) which will decide how many coloumns of data you will be saving in the file. I want to plot the first coloumn in that data file in the X axis and the rest of the coloumns in the Y axis, thus making as many plots as the input parameter.

I really appreciate if sombody has any idea how to proceed.

Thanks for your kind time.

Regards,

Medhi.

[GregFreeman]

so you are saying you wont know the exact number of columns being read and how do you make your plot go from maybe plotting 2 lines to plotting 10 dependin on the data in teh file correct? I don't have labview on this computer, but im sure someone can put an example, i'm just trying to clarify your question a little. I'm sure someone else will come on here with a response soon, this is a fairly  trivial question. Keep searching the forums i'm sure there is something out there on this situation already. Best of luck.

[Medhi]

Yes you are right. Thanks for the reply. .

[altenbach]

Just delete the first column using "delete from array" and transpose the remaining 2D array. Get the first column from the "deleted portion" output.

Now autoindex the 2D array in a FOR loop. Inside the FOR loop, bundle the X (the first column, not autoindexed) with each Y array from the autoindexing terminal and autoindex the cluster at the right edge and feed ot to the XY graph.

All clear? 🙂

[PJS]

There are many different ways to solve this issue.  But first, let me ask you a couple questions.

1. Are the points evenly spaced on the X-axis? IE, could be described with T0 and deltaT
2. How big are the data files?
3. If there is 6 columns in the data file, would there be a reason to display 3 graphs rather than 5?  Or would you always want every column in the file?

[altenbach]

---

altenbach wrote:

All clear? 🙂

---

Here's a quick draft. Modify as needed.

Message Edited by altenbach on 11-04-2009 05:48 PM

[GregFreeman]

Ah, the old LabVIEW proverb. A picture is worth a thousand words...case and point..

Told you someone would help 🙂

---

altenbach wrote:

Just delete the first column using "delete from array" and transpose the remaining 2D array. Get the first column from the "deleted portion" output.

Now autoindex the 2D array in a FOR loop. Inside the FOR loop, bundle the X (the first column, not autoindexed) with each Y array from the autoindexing terminal and autoindex the cluster at the right edge and feed ot to the XY graph.

All clear? 🙂

---

Message Edited by for(imstuck) on 11-04-2009 08:31 PM

Message Edited by for(imstuck) on 11-04-2009 08:32 PM

[Medhi]

Perfect.

This is exactly what I want. 

Thanks a ton.