Add column to large array

All-
I have my data (20 columns by ~700,000 rows) stored in a binary file and I would like to add a timestamp to each row of data. I plan to use the sample rate with the number of samples to add the time at which the sample was recorded to the data. I read the data in (~700,000 samples) and use for a loop to great a 1D array with the same number of rows of data and then insert the 1 column into the larger array that has my data. However this seems to take a significant amount of time and I am searching for a faster/simpler way. Ny significant I mean the vi runs for ~20min before I give up and stop it. I posted a png of the block diagram. Any help will be much appreciated.
Thank you,
Chris
Solved!
Go to Solution.

Hi smercurio,
the vi seems to be loaded from an older "project" (pre LV8) as is shown by the automatically inserted error cluster unbundle function after the file selection...
But LV8.5 also explains why the diagram cleanup wasn't used before posting
Message Edited by GerdW on 08-20-2009 04:43 PM
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

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Hi there,
I want to insert data from either a 1D or 2D array from LabView into Excel and create graphs.
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http://www.ni.com/example/28934/en/
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Solved!
Go to Solution.
Attachments:
ExcelAreaScan.png ‏60 KB

Hello everyone and thanks for the answers.
I only have the LabView Student Edition available here - is the toolkit included in it too. How can I check if it is installed/ available and in case it is installed - where can I find it?
Today I had time to take a look at the example
Create via ActiveX Labview a XY Scatter plot graph on an excel sheet
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I also took a look at the other example for inserting 2D attays - it seems to be what I need, I just had no time so far to test it, I'll post an update when I could test it.
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AdvancedDataGrid - Add columns with ActionScript

I'm trying to add columns to an AdvancedDataGrid via ActionScript.
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Thanks for any help.
=== START adg_test_renderer.mxml ===
<?xml version="1.0" encoding="utf-8"?>
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=== END adg_test_renderer.mxml ===
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<?xml version="1.0"?>
<mx:Application
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           {Artist:'Saner', Album:'Helium Wings', Price:12.99},
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           {Artist:'The Doors', Album:'Morrison Hotel', Price:12.99},
           {Artist:'Grateful Dead', Album:'American Beauty', Price:11.99},
           {Artist:'Grateful Dead', Album:'In the Dark', Price:11.99},
           {Artist:'Grateful Dead', Album:'Shakedown Street', Price:11.99},
           {Artist:'The Doors', Album:'Strange Days', Price:12.99},
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== END adg_test.mxml ====

Thanks so much for your help.
Here's how I altered your code for my example. This logic allows easier assignment of additional column parameters.
=== START adg_test_renderer.mxml ===
<?xml version="1.0" encoding="utf-8"?>
<mx:VBox xmlns:mx="http://www.adobe.com/2006/mxml">
    <mx:Button id="btnTest" label="Renderer Working"/>
</mx:VBox>
=== END adg_test_renderer.mxml ===
== START adg_test.mxml ====
<?xml version="1.0"?>
<mx:Application
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           {Artist:'Pavement', Album:'Brighten the Corners', Price:11.99},
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           {Artist:'Grateful Dead', Album:'In the Dark', Price:11.99},
           {Artist:'Grateful Dead', Album:'Shakedown Street', Price:11.99},
           {Artist:'The Doors', Album:'Strange Days', Price:12.99},
           {Artist:'The Doors', Album:'The Best of the Doors', Price:10.99}
         [Bindable]
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           {Artist:'Pavement', Album:'Slanted and Enchanted', Price:11.99},
           {Artist:'Pavement', Album:'Brighten the Corners', Price:11.99},
           {Artist:'Saner', Album:'A Child Once', Price:11.99},
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           {Artist:'Grateful Dead', Album:'In the Dark', Price:11.99},
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== END adg_test.mxml ====

How to add Column to Adobe flex mx:DataGrid in mxml and/or actionsctpt?

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Thanks and Regards,
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<<text removed>>
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I'm not sure how to optimize the code so it doesn't take forever. It currently takes at least 40 minutes, and I'm still running it, to create and write this array. I know there needs to be a better way, as the array is large and consumes a lot of memory but it's not absurdly large. The computer I'm running this on is running Windows Vista 32-bit, and has 4GB RAM and an Intel Core 2 CPU @ 1.8Mhz.
I've read the "Managing Large Data Sets in LabVIEW" article (http://zone.ni.com/devzone/cda/tut/p/id/3625), but I'm unsure how to apply the principles here. I believe the problem lies in making too many copies of the array, as creating and writing 1x10^6 values takes < 10 seconds, but writing 4x10^6 values, which should theoretically take < 40 seconds, takes minutes.
Is there a way to work with a reference of an array instead of a copy of an array?
Attached is my current VI, Generate_Square_Pulse_With_TDMS_Stream.VI and it's two dependencies, although I doubt they are bottlenecking the program.
Any advice will be very much appreciated.
Thanks
Attachments:
Generate_Square_Pulse_With_TDMS_Stream.vi ‏13 KB
Square_Pulse.vi ‏13 KB
Write_TDMS_File.vi ‏27 KB

Thanks Ravens Fan, using replace array subset and initializing the array beforehand sped up the process immensely. I can now generate an array of 45,000,000 doubles in about one second.
However, when I try to write all of that out to TDMS at the end LV runs out of memory and crashes. Is it possible to write out the data in blocks and make sure memory is freed up before writing out the next block? I can use a simple loop to write out the blocks, but I'm unsure how to verify that memory has been cleared before proceeding. Furthermore, is there a way to ensure that memory and all resources are freed up at the end of the waveform generation VI?
Attached is my new VI, and a refined TDMS write VI (I just disabled the file viewer at the end). Sorry that it's a tad bit messy at the moment, but most of that mess comes from doing some arithmetic to determine which indices to replace array subsets with. I currently have the TDMS write disabled.
Just to clarify the above, I understand how to write out the data in blocks; my question is: how do I ensure that memory is freed up between subsequent writes, and how do I ensure that memory is freed up after execution of the VI?
@Jeff: I'm generating the waveform here, not reading it. I guess I'm not generating a "waveform" but rather a set of doubles. However, converting that into an actual waveform can come later.
Thanks for the replies!
Attachments:
Generate_Square_Pulse_With_TDMS_Stream.vi ‏14 KB
Write_TDMS_File.vi ‏27 KB

Add columns in system matrix

Hi experts,
I need help urgently. I want to add columns in the matrix of A/R invoice system form.
Can someone give me a solution?
Regards.
Olivier

Olivier
You can add user defined fields into Marketing document rows, these will be new columns and will appear U_[COLUMNAME]
Regards
J
Edited by: János Nagy on May 18, 2010 2:01 PM

Add Column name conditionally in a query

Hi i have an stored procedure where one parameter is passing
@Type
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i wants to add column conditionally like when usertype =1 then query should be like
Select * from userTable where canAdminDelete=0
when userType=2
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Like in this way. I know i can write three if statments and write specific query.
But this is just an example i have very big query actually.
Please give some idea.
Thanks
Niki

Hi Niki,
As per my understanding, I think the query post by Olaf is correct. It only return the results when column canAdminDelete = 0 and userTpe = 1 or column canCustomerDelete = 0 and userType = 2.
So when userType=1 and column canAdminDelete=1, how could you get the results? Could you please test the issue again based on the query post by Olaf.
If there are any misunderstanding, please elaborate the issue for further investigation.
Thanks,
Katherine Xiong
Katherine Xiong
TechNet Community Support

How to Add column with default value in compress table.

Hi ,
while trying to add column to compressed table with default value i am getting error.
Even i tried no compress command on table still its giivg error that add/drop not allowed on compressed table.
Can anyone help me in this .
Thanks.

Aman wrote:
while trying to add column to compressed table with default value i am getting error.This is clearly explain in the Oracle doc :
"+You cannot add a column with a default value to a compressed table or to a partitioned table containing any compressed partition, unless you first disable compression for the table or partition+"
http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/statements_3001.htm#sthref5163
Nicolas.

Add column to large array

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