cheekychops

QUOTE (MJE @ Mar 27 2009, 02:40 AM)

All graphs/charts have two properties exposed via property nodes: Active Plot, and Plot.Visible. Use the active plot to set which plot you're dealing with, then set the visibility of that plot. See the attached VI.

http://lavag.org/old_files/post-11742-1238121732.vi'>Download File:post-11742-1238121732.vi

thanks for the reply, can you please save that file in labview 8.2 or 8.5?

thanks again

Is there any other ways to do this?

Thanks

Hi Guys

Can anyone give me a clue on how to add some on/off buttons to plots on a XY graph. Ex: if I have more than one plot on one XY graph, how can I add some buttons on the front panel so I can turn each plot on and off?

Thanks

Hi

Thanks for the replies. I have attached what it looks like now. It works fine as long as I read the values from a TXT file. However when I try to upload the data from Excel it dont not output anything. Any idea why? I guess I am missing some inputs to the read from spreadsheet VI. Just cant workout which ones.

hmm help says ReadFromSpreadSheetFile can open data from a excel datasheet saved in TXT format. is there anyway to modify this so Excel worksheet can be opened?

Hi

I wonder if someone can please help me, I dont want anyone to do the work but points or hints on where I am going wrong would be really appreciated.

Basically I have the following excel sheet, I want to read the first coulmn into one array and the other into another.

0.5012 0.0018

0.4961 0.0009

0.4902 -0.0003

0.4852 -0.0012

0.4791 -0.0022

0.4741 -0.0031

I have attached what I have done so far, I am guessing it outputs each row in and array?? so I end up with lots of arrays corresponding each row? is this right?

Thanks

Hi Guys

Would I need any special NI s/w or h/w to detect a colour in Labview?

Thanks

Hi

I major in Computer systems. I have followed programming in Java, C++, have also done concurrent programming in C. I have used Labview before to create waveforms and work with them, also used the Ni Elvis to acquire data. I must admit I dont have a great knowledge in Electronics, hence I am not sure what type of project I can manage.

Thanks.

Hi,

I wonder if you guys can please help me with some project ideas for my final year project, I am suppose to come up with a project title in LabView, I have intermediate knowledge in LabView(arrays, charts and graphs, structures, acquiring data using DAQ and also have access to USB interface).

Any ideas would be really appreciated.

Thanks.

Thanks /J worked :thumbup:

QUOTE (JFM @ Apr 30 2008, 05:37 PM)

Maybe like this

1. A = your array

2. Check A greater than t, where t is a threshold value (i.e. use A > t), gives you a boolean result array B.

3. Search B for value of TRUE, this gives you the index of the leading edge.

4. Use the leading edge index as start index and search B for a value of FALSE, gives you the trailing edge index.

/J

I tried Threshold array but it would not work, as I need to find the exact index of the leading edge and exact index for the falling edge. I have given attached a pic of the waveform I am trying to work with.

Can someone please help.

Basically I was given data for a waveform graph(with two waveforms), from which I was able to extract two 1D arrays using

"index array".One of the waveforms create a square wave with one pulse with a leading edge and lagging edge. I was wondering how can I find the index of the leading edge of this array. I dont want anyone to do the work for me, but just pointers on how to go about.

Thanks!