Logic of array and plotting functions?

Hi,
I started to build versatile acquisition programn with labview (with NI cards it seemed to be the best option) and it took quite an effort to adjust the way of thinking while shifting from other programming environments. I start to see the logic behind the labview but I have serious difficulties on figuring out how the labview's array and plotting functions work. Here's a simple example for replacing array subset and plotting it, which just doesn't work as i'd expect. I thought this would first initialize 10 rows, 1000 cols matrix of which the certain row would be replaced (zero padding when new row is longer than the original). The resulting matrix would then be displayed each row having its own windows in the stacked plot. It seems to do something totally different...
Attachments:
koe4.vi ‏303 KB

As you noticed, "Replace Array Subset" can only replace array elements that exist. If it's not there, there's nothing to replace.
What you'll need to do is make the array larger by using the "Insert into Array" function. Use this function cautiously though. It requires LabVIEW to dynamically reallocate memory while the program is running, and takes time. If you only do the 'Insert' when needed, you should be OK.
Use the "Array Size" function to get the size of the array to be inserted, then you can choose between the ‘Insert’ or ‘Replace’ functions.
Ed
Ed Dickens - Certified LabVIEW Architect - DISTek Integration, Inc. - NI Certified Alliance Partner
Using the Abort button to stop your VI is like using a tree to stop your car. It works, but there may be consequences.

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Hi, this is a little complex, so bear with me...
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germ Remove "nospam" to reply

In article <[email protected]>,
chutla wrote:
> Greetings!
>
> You can use any of the 3D display vi's to show your "main" 3d
> data, and then use color to represent your fourth dimension. This can
> be accessed via the property node. You will have to set thresholds
> for each color you use, which is quite simple using the comparison
> functions. As far as the data is concerned, the fourth dimension will
> be just another vector (column) in your data file.
chutla, thanks for your post, but I don't want a 3D display of the
data....
> Also, check out
> the BUFFER examples for how to separate out "running" data in real
> time.
Not clear to me what you mean, but will c
heck the BUFFER examples.
> As far as autoscaling is concerned, you might have to disable
> it, or alternatively, you could force a couple of "dummy" points into
> your data which represent the absolute min/max you should encounter.
> Autoscaling should generally be regarded as a default mode, just to
> get things rolling, it should not be relied on too heavily for serious
> data acquisition. It's better to use well-conditioned data, or some
> other means, such as a logarithmic scale, to allow access to all your
> possible data points.
I love autoscaling, that's the way it should be.
germ Remove "nospam" to reply

Message determination and Partner function LS (Logical system) for PO

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----------------------------------------------------------------

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Does Logic Pro X include replacement functionality for Compressor, Soundtrack Pro and Waveburner from Logic Studio 9?

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Hello Everyone
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ECG vi.vi ‏117 KB

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Read and plot multiple lvm

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Attachments:
lvm to multiplotxy.vi ‏91 KB

Hello Timothy,
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Large Arrays and Memory

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Val
Solved!
Go to Solution.

I have attached a photo of the portion of code that I was referring to. It shows 2 photos so you can see all possibilities in the 2 case statements.
The first picture is when the cycle is adding new data points, and does not clear the array.
The second picture shows the program passing through the array (which it does every second cycle) and then "clearing" the array. (Which as I state above, I didn't know if that was correct).
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Thanks,
Val
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loop.docx ‏105 KB

How to ask for an array and how to save the values

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I made the changes. Two more questions.
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Need help on mapping of obsolete and new function module

Hi Expert,
We are working on a upgradation tool in which i have to repace the obsolete function module "HELP_VALUES_GET_WITH_CHECKTAB
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Moderator message : Duplicate post locked. Continue with [Parameter mapping of FMs|Parameter mapping of FMs;.
Edited by: Vinod Kumar on Jul 8, 2011 9:40 AM

Hey Enivass,
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Dynamically create empty mcs and asign elements from array and loadmovie

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It doesn't do you much good to work with borrowed code that you do not understand. Your best bet will be to start small, creating one functional piece of the puzzle at a time, and work your way up. Start with making sure you are loading and parsing the xml properly, then set about loading the external content, then see about making that content move around, etc...
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Read from csv file and plot particular columns

Hello,
I`m a new user of Labview and here it comes...my first major problem.
Maybe this has been discussed before. I’ve made a search to solve my problem first but I couldn`t find anything helpful so I `ve decided to post a new message.
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Sorry for my awful English. I hope you can understand my problems since English is not my mother language.
Please find the attached files.
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Have a nice day!
Attachments:
growth log.csv ‏298 KB
Read from growth log.vi ‏33 KB

Hello again,
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Xl Timestamp to Time.vi ‏21 KB

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http://www.ni.com/example/28934/en/
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I figured out how to add new Worksheets and as I also need to create a certain number of Worksheets and I know that on standard 3 sheets are present when creating the file, I use the 'add' methode to create every new worksheets before worksheet 3 - I could use the same methode to create new columns in Excel, but so far I didn't find a methode to do so. Or is there a way to enter the whole 2D array at once?
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http://www.ni.com/newsletter/51339/en/
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Moreover on the snippet I placed an ActiveX Worksheet Property with the Chart Object - as I can see the difference to the Chart Object in the example code from the last link above is the color. However I'm not sure what that means and how to change/ solve this.
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Solved!
Go to Solution.
Attachments:
ExcelAreaScan.png ‏60 KB

Hello everyone and thanks for the answers.
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How do you save characters in an array and then output the characters as a string one by one.

I want to know how to save a number of different characters to an array. then after open this array and read these values one by one as a string.

Input to your loop has indexing enabled. What happens is that on the first iteration, the indicator displays the first string in the array, then in the next iteration, the indicator displays the second string in the array, the first one is overwritten. This happens so fast that all you see is the second one. Look at attached vi in LV6.1 to see how to concatenate both into one indicator. You really need to study Labview to learn the functions. Go to NI's website and search for Labview tutorials.
- tbob
Inventor of the WORM Global
Attachments:
ConcatString.vi ‏28 KB

To read & save data from serial port (write to .csv file), and plot data as waveform

Hi,
I've been stuck with this problem for weeks and really need some help. I've been searching a lot but I can't find a proper solution.
I am trying to use Labview to plot and display some parameters of a data acquisition system for a project.
The data acquisition system is connected to a computer via serial connection through COM 1 port.
The data acquisition system sends a serial stream of data (ASCII string with baud rate 19200), as shown below (from HyperTerminal),
01:00:26,933.24,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
01:00:27,931.54,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
The serial data stream consists of a time stamp (as 1st data), followed by 16 individual channel data, separated by comma "," and each stream ending in return "\n". Each value of the data ranges from 1 to 6 digits (value of -5000 to 15000).
I have no problem reading this values correctly using HyperTerminal, but I have problem to plot and display individual parameters of this serial string in Labview. I want to save the entire data in a “.csv” file corresponding to all the 16 channels with time stamp and plot each individual channel parameter in a graph with time on X-axis.
I am relatively new to Labview hope I can learn a lot from your help.
　Thank you

Thank you Dennis.........
Now I had modified the program incorporating1D array for gauge display.....but currently I have a new problem. The program is running updating the file, waveform graph and Gauge very slowly. Approximately once in every 15 seconds 16 data streams are getting updated in a bunch with gauge sticking to the last value rather than indicating real time value.
eg.
12:33:41,-3728.78,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:42,-3730.47,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:43,-3729.81,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:44,-3733.80,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:45,-3733.57,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:46,-3729.27,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:47,-3725.97,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:48,-3730.14,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:49,-3733.20,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:50,-3733.60,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:51,-3732.24,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:52,-3734.51,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:53,-3728.07,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:54,-3732.54,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:55,-3732.24,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:56,-3731.58,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
gets updated in a bunch after 15 seconds, rather than in every second. I thought the problem is with while loop but, i realised there is no delay associated with it..... Can u kindly help me in modifing the program so as it can update the waveform, file data and gauge in real time? (I have attached the modified VI file "suitcase new.vi" and the data gathered after executing the same as in "Trail.txt".)
Thank You,
Rahul
Attachments:
trail.txt ‏85 KB
suitcase new.vi ‏44 KB

Logic of array and plotting functions?

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