Creating a waveform from a set of data points

I have a set of Y values which are spaced 1/sampling rate apart. I am trying to build a waveform with them, but buildwaveform.vi does not seem to be working. Any suggestions? Thanks.
Intern NSWCCD Carderock.

Did you try the build waveform function.
Look at annex,
Hope it helps,
Paulo
Attachments:
BuildWaveform.vi ‏27 KB

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Creating intensity graph from ywo sets of data?

Hi,
In my vi, I am getting two data set dependent on each other, i.e. amplitude(y) versus position(x). The data acquisition of x-y data happens in a for loop. This data is transferred outside the loop with index enabled. Outside the loop I want to plot an intensity graph out of these data, while z=amplitude, x=position,y=not important, say index. I don't want simply to transfer the amplitude data outside the loop and connect the 2D array of amplitude to the intensity graph. I want to preserve the position information in the intensity graph. How can I do this?
Thanks

Here is a link to a posting that may have been yours also. Just some ideas I had. I hope it can help you get started somewhere.
J.R. Allen

Create waveform from a set of points with differtent time intervals

Hello,
I would like to create a waveform from a set of points like this
Time           Data
0                 0
0,5              1
0,6              2
1                 1
2                 0
5                 1
The problem is that the time interval between each points are not the same.
The only idea I found was to create a waveform for each doublet of points with the same rate (100ms) and than to append them together.
Does anybody have a better idea?
Regards,
Risotto.

If you use a Wave From data type, re-sampling is not required.
When using a WF datatype the chart (graph) will pick-up the X value from the t0 of the waveform.
The trick is to just build an array of the single update value and make sure the t0 value is correct.
Re-create this example
and try it for yourself.
Ben
Note: make sure the data you pass is consistant with the data already displayed. If you post a t0 value that is older than what is already displayed, the chart will clear the display and start over.
Message Edited by Ben on 09-15-2006 11:49 AM
Ben Rayner
I am currently active on.. MainStream Preppers
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Attachments:
WF_Datatype.JPG ‏59 KB

Why do i get 2 curves and not just 1 when i create a diagram from a row of data in a table ?

Why do I get 2 curves and not just i when I create a diagram from a row af data in a table ?

Erik,
Thank you for giving me the points. Generally you wait to award points until your problem is solved. It is totally your at your descretion.
OK.
This is still not clear. To post a screenshot get the "stuff" you want to show in view on your screen, then type the key combination <Command>+<Shift>+3. The cursor will change to a crosshair. Click and hold on the top-left corner, then drag to enclose what you want to show (to the bottom-right corner), then release. The screenshot will appear on your desktop and will be named something like "".
Now click the camera icon in the tool bar for this forum:
, click the text box to allow you to navigate to, and select your screenshot.
Here is what you sent me:
The graph does not seem to be associated with the table of data you are showing. Generally when you highlight a graph the corresponding table will highlight and show the source of each of the series in the graph (dark and light blue).
This is what I would expect to see when highlighting a graph:
Right now I think there is ANOTHER table arround that is the source for the graph and the table you show is "just another table". You can move your data into the table the graph refers to by copy and paste, or simply typing the values. You can change how many series there are by grabbing the little circle at the bottom right of the highlighted cells (when you have the graph highlighted) and dragging as shown:
The Numbers Users' Guide is a great resource you should utilize and can be found here:
http://support.apple.com/manuals#macosandsoftware
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Create an area from a set of points

How to create an area from a set of points ? I searched everywhere but could not find a better solution for it. Let�s say that I have a matrix that contains the points for a shape. I�ll need a way to connect the points near each other continuously to form the outline for the shape.
Thanks fro any feedback.

... But I'll also need a way to connect
those points in an order so that they'll form the
path (edge) of the shape.Do you mean the Convex Hull [1] of a set of points?
If so, you could find it by implementing a Graham Scan [2] algorithm and then calculating the area of the polygon [3].
[1] http://mathworld.wolfram.com/ConvexHull.html
[2] http://en.wikipedia.org/wiki/Graham_scan
[3] http://mathworld.wolfram.com/PolygonArea.html

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I am trying to plot two sets of data points in 3d graph. I also need to make a set of data with one color and the other set with a different color. For example, I need to plot 10 (x,y,z) data points in 3d. Maybe 6 points need to be blue, and the other 4 red. Could you tell me how?

What is your LabVIEW version? (things are a bit different in 8.6).
Basically, you create multiple instances of the VI that gets placed automatically when you drop the 3D graph and then wire a different number to the plot ID at the bottom.
You define all the plots (color, style) via the properties dialog.
Have a look at my example posted here. One plot is "blue dots" and one is a "shaded surface". See how far you get.
Message Edited by altenbach on 04-23-2009 01:11 PM
LabVIEW Champion . Do more with less code and in less time .

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I have a set of data our of from power spectral density measurement.
I want to curve fitting with the data.
But I want to cut off below a certain frequency. For instance, the PSD
data
contains {(1,10),(2,3),(3,4),(4,3),...} and I want to fit from 3 Hz
{(3,4),(4,3)...}.
I tried high pass filter but it does not change. I tried several ways such
as
get time stamp and find the index for the element and remove the array
using
'Array'tools. It cuts off the data sets that I wanted to remove but it
does
not remove the frequency values. So it works like {(1,4),(2,3)....}
instead of
{(3,4),(2,3)..}. Please let me know how I can make this work.
Thanks.
Attachments:
new-PSD-factor-v3.vi ‏522 KB

Hey Arrow,
I think I understand your question better now. You'll want to use the "delete from array.vi". It can be found by going to all functions>>Array. You'll need to input the array to be edited, which index to begin deleting from and how many elements to delete. From your application it sounds like you'll want to start from element zero and delete the number of elements that corresponds to 0 through 4 Hz.
In addition, you'll need to create an array that represents the frequencies you want to plot (4 1000 Hz or your upper limit). There'll need to be one frequency on your x axis for each element in your PSD array. Then bundle the two arrays together and plot them on an XY plot. You can use the "bundle" vi to accomplish this. You can find examples using clusters from help>>find examples. Then navigate to Fundamentals>>Arrays and Clusters.
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Chris Cilino
National Instruments
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Certified LabVIEW Architect

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But i have some some tables and where information is too large i dont want backup all data from this tables. because i dont have enough space on my test server.
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Thanks

But have suggestion.
You can create duplicate database on based your target database (to new host) and skip undesired tablespaces...
bash# rman target /
RMAN> ....
your code should be like :
run {
allocate auxiliary channel 'dev_0' type 'sbt_tape'
parms 'SBT_LIBRARY=/opt/omni/lib/libob2oracle8_64bit.so,ENV=(OB2BARTYPE=Oracle8,OB2APPNAME=my,OB2BARLIST=MY DAILY)';
allocate auxiliary channel 'dev_1' type 'sbt_tape'
parms 'SBT_LIBRARY=/opt/omni/lib/libob2oracle8_64bit.so,ENV=(OB2BARTYPE=Oracle8,OB2APPNAME=my,OB2BARLIST=MY DAILY)';
allocate auxiliary channel 'dev_2' type 'sbt_tape'
parms 'SBT_LIBRARY=/opt/omni/lib/libob2oracle8_64bit.so,ENV=(OB2BARTYPE=Oracle8,OB2APPNAME=my,OB2BARLIST=MY DAILY)';
allocate auxiliary channel 'dev_3' type 'sbt_tape'
parms 'SBT_LIBRARY=/opt/omni/lib/libob2oracle8_64bit.so,ENV=(OB2BARTYPE=Oracle8,OB2APPNAME=my,OB2BARLIST=MY DAILY)';
SET UNTIL SCN 7769764681915;
DUPLICATE TARGET DATABASE TO MYTS SKIP TABLESPACE TOOLS_IDX,TOOLS,ARCHIVE,IDX;
Edited by: Ulfet Tanriverdiyev on Dec 21, 2010 3:42 AM

How to find Majority from a set of data

Dear Oracle Guru's
I have a set of data something like for example
Payment Amt which has data like this (45,53,46,45,52,45,63,45,44,45,41,45...)
I have to find the Majority Payment amt .in my given example it is 45 ... i.e Maximum occurrence.
I couldnt get it correctly . I thought of AVG , and MEDIAN .... but not exactly correct
Is there any other method or function which is eluding me
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With Warm Regards
ssr

May be this ->
satyaki>
-- Start Of Virtual Table For Data --
satyaki>with temp
2 as
3    (
4       select 45 amt from dual
5       union all
6       select 53 from dual
7       union all
8       select 46 from dual
9       union all
10       select 45 from dual
11       union all
12       select 52 from dual
13       union all
14       select 45 from dual
15       union all
16       select 63 from dual
17       union all
18       select 45 from dual
19       union all
20       select 44 from dual
21       union all
22       select 45 from dual
23       union all
24       select 41 from dual
25       union all
26       select 45 from dual
27    )
-- End Of Virtual Table For Data --
28 select amt,
29         count(*)
30 from temp
31 group by amt
32 having count(*) = (
33                  select max(count(*))
34                  from temp
35                  group by amt
36                 );
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Elapsed: 00:00:01.05
satyaki>
satyaki>Regards.
Satyaki De.

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Is there an option to make such DLL "reopenable" or "reentrant"?
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The DLL is written by Lavview tool to encapsulate VI and get them reachable from CVI: the board supplier no loger delivers a C-compatible DLL, only Labview driver and C# / .net / Java... modules, that implies heavy changes in our application to manage. NI support suggested to make this way a DLL from the set of VI delivered by supplier.
In our case, on XP, the main application was using the board but it was possible in parallel to send commands from an other application.
You're right it may be a question of locking resources by DLL / VIs functions: I'd like to know it there is a specific otpin when creating the DLL to make it reentrant and possibly get double access.

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Attachments:
hiqgraph.HiQ ‏14 KB

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Creating a waveform from a set of data points

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