Deleting peak values detected by peak detector vi

Hi,
I m using the peak detector vi to detect peaks every 100 samples, if the difference between two consecutive peaks is greater than 15 i want to delete the peak with the higher amplitude only. This data set, should be plotted again on another waveform. I m able to detect peaks that have amplitudes greater than 15, but I dont kn ow how to delete only these peaks.
Attached is the waveform, with a single peak with high amplitude which I want to delete.
Any help would be appreciated.
Thank you.
Regards.
Attachments:
peak_detection.doc ‏88 KB

Hi Prakruthi,
please have a look at this forum thread:
http://forums.ni.com/ni/board/message?board.id=170&message.id=69416&requireLogin=False
It contains a complete VI for deleting peaks. You only have to insert one more condition to deal with the "only peaks with difference > 15" requirement.
Regards,
Johannes Bauer

Similar Messages

I am trying to detect signal peaks (derivatives of the peaks both +ve and -ve peaks). simultaneously 2 peaks detectors are running, 1 for +ve and other for -ve peaks.

i am trying to detect signal peaks (derivatives of the peaks both +ve and -ve peaks). simultaneously 2 peaks detectors are running, 1 for +ve and other for -ve peaks. when a peaks get detected it would trigger a pulse of approx 1 sec duration and at the same time it would disable the other peak detector for 1 sec time duration. after the time period, again both the peak detectors would be enabled. i have been able to detect both peaks but still not able to control the detectors block the way mentioned before.
the code and the data are attached.
Attachments:
eog peak detection.vi ‏192 KB

I'm not suggesting any of this as a model, and your needs are different than mine.
1) Go to Preferences -> Audio. Under "Default Audio Tracks", Set "Mono Media: Mono". Set "Stereo Media: Mono" (Choices from the pull-down for both are Use File, Mono, Stereo, 5.1, Adaptive)
You can change these, but I don't. I am using both mono and stereo tracks. I set up a custom sequence with the particular combination of stereo and mono tracks I want.
2) Set audio for clips by selecting all clips and going to Modify Clip -> Audio Channels Tab. Under "Number of Audio Tracks" there should be a "1". Under Channel Format it should read "Stereo".
I am not sending the audio to anyone else to edit further. I am doing a final stereo mix. If camera one is set up to record 2 mikes as a stereo track, then I leave that unchanged and put it onto a stereo track. If camera two is set up to record one mike onto channel 1 as ambient sound and channel 2 is a mono feed from a sound board, then I modify those clips as Preset Mono, 2 audio tracks, Channel format Mono, and that puts the left source channel (or whichever I choose) onto Audio track 1, channel 1 (of one), and right source channel onto audio track 2, channel 1.
4) Delete all the existing audio tracks in the sequence and replace them all with mono tracks, so all tracks in the sequence are mono.
I modify the tracks while creating the sequence, and ultimately use a custom sequence.
Under my Effects Controls panel there is only Channel Volume, and nowhere to adjust the pan.
I'm using the mixer, not the effects control panel.

What does the location of the peak detector mean

i would like to know what the locations of the peak detector refer to? what does the value of the location of the peak detector tell? does it tell the location of the peak and if so, what unit is it in? also, if i set a threshold value, does it mean that only one peak would be detected or any value higher than that threshold would also be detected? if i were to set the sampling rate for my peak detection to be 400 per millisecond, do i expect to see an array of values or one absolute peak value after one cycle?

Greetings!
The peak value VI gives you four outputs, actually: positive and negative peak values and the positive and negative peak "horizontal" locations. The locations are in data points, not actual time. To get the time, you have to calculate it from your sample rate. Also, the vi does indeed give you the absolute peak of a waveform, which, as you can guess, requires that the entire waveform is sampled BEFORE the calculation is made. This can slow down real-time sampling, since there is considerable processing involved in calculating the peak value...you need to keep this in mind when designing your application. To answer your last question, you will obtain ONE reading per trigger.
Hope this helps!
Eric
Eric P. Nichols
P.O. Box 56235
North Pole, AK 99705

How to use filter vis and peak detectors in compactRio

Hi all,
We are
using compact rio 9002 with IO module 9215. We are accessing a sine
wave(of 1 KHz) input with some DC components in it. We need to filter
out the DC and get the peak value of that sine wave. We have developed
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Regards,
Bassett

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I also find the thresholds used will give different results.
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Bug in 1.5.1 Deleting number value in data grid

Hello,
it is not possible to set a number in a column to NULL by simply deleting the value
DROP TABLE tab_test;
CREATE TABLE tab_test(
dat DATE
,num NUMBER
,var VARCHAR2(2)
INSERT INTO tab_test (dat,num,var)
VALUES (TO_DATE('01.01.2009','dd.mm.yyyy'),4,'ff');
COMMIT;Open the table in SQL Developer and select data tab.
Deleting the date value and commiting is ok
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Commit Successful
Deleting the number value and commiting raises an error
UPDATE "RVS_FE"."TAB_TEST" SET NUM = WHERE ROWID = 'AAA6Q0AAGAABHUlAAA' AND ORA_ROWSCN = '10443975285'
One error saving changes to table "RVS_FE"."TAB_TEST":
Row 1: ORA-00932: inconsistent datatypes: expected NUMBER got DATE
Rollback Successful
Deleting the char value and commiting is ok
UPDATE "RVS_FE"."TAB_TEST" SET VAR = WHERE ROWID = 'AAA6Q0AAGAABHUlAAA' AND ORA_ROWSCN = '10443975285'
Commit Successful
Regards
Marcus
Edited by: Marwim on 26.11.2008 08:59

Jim, I could reproduce and see the error, no change columns order.
You can use the Marwim script's and, on the data grid, select the column DATE, delete value and commit.
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Hi
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Edited by: user9195968 on Feb 25, 2010 6:30 AM

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How to delete the values from TKOMV at runtime after creating PO from IDOC. I am creating PO through IDOC, subsequently need to create Sales order and again need to create 2nd PO with reference of Purchase Requestion(created with sales order). At the time creation of 2nd PO the Header conditions are appearing twice and net price value is appearing wrong.
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Does anyone have practical experience with deleting COPA value fields in a productive system?
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To delete characteristics or value fields, you should perform the following
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1. Delete the corresponding characteristics and value fields from
Customizing in all clients (this includes forms, reports, planning
layouts, and so forth). To locate characteristics and value fields, use
the appropriate where-used list in the Customizing Monitor. You can
access it by choosing Tools -> Analysis -> Check Customizing Settings
(TA KECM).
You can jump directly from the where-used list to the relevant
Customizing transaction and then delete the appropriate field there.
2. Switch to the screen for maintaining the data structure of an
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save the data structure.
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choose Extras -> Characteristics (or Value fields) -> Unlock.
5. Select the characteristics and value fields to be deleted and remove
them from the data structure with the "Reset fields" function.
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whether the operating concern contains any data and whether the fields
to be deleted are still being used in any Customizing settings.
7. If none of the fields are still in use, the system then starts the
re-activation. If the operating concern does not contain any data or
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apply.
If the operating concern already contains data, a system message tells
you that the database needs to be converted. If you proceed, an
activation log appears (at the top of the list).
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You must otherwise remove the cause of the errors before the tables can
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which asks whether the conversion transaction should start.
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tables, choose "Back" and start the conversion.
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is shown for this. If the tables only contain a small amount of data
(less than 10 000 records), then all the tables can be converted in one
job. In that case, you can select all the tables.
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concern) is the last table to be converted.
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Using the database utility transaction. You access this by choosing
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generate the operating concern environment from within operating concern
maintenance.
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Please, refer to the IMG documentation under Controlling ->
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How to delete a value from the nested structure?

Hi Friends!
I have a nested structure such as
multimap<int, map<int ,set<int>>> FinalMul
It contains sample values
1=>4--->1
6=>4--->1
6=>9--->4
11=>4--->1
11=>5--->1 4
11=>9--->4
12=>2--->1 4 5
I want to delete the value 4 from the second and third column,
So, it looks like
1=>
6=>
6=>9--->
11=>
11=>5--->1
11=>9--->
12=>2--->1 5
after deleting 4, if I have a key(first) (1, 6, 11) and secondkey (second)(6=>9--->, 11=>9--->) with no values, then delete them also.
Finally it looks like
11=>5--->1
12=>2--->1 5
Can anyone help me how to solve it?
I just tried something;
set<int> tempV;
map<int, set<int>> tempM;
multimap<int, map<int, set<int>>> FinalMul
tempV.insert(1);
tempM.insert(make_pair(4, tempV));
FinalMul.insert(make_pair(1, tempM));
tempV.clear();
tempM.clear();
tempV.insert(1);
tempM.insert(make_pair(4, tempV));
FinalMul.insert(make_pair(6, tempM));
tempV.clear();
tempM.clear();
tempV.insert(4);
tempM.insert(make_pair(9, tempV));
FinalMul.insert(make_pair(6, tempM));
tempV.clear();
tempM.clear();
tempV.insert(1);
tempM.insert(make_pair(4, tempV));
FinalMul.insert(make_pair(11, tempM));
tempV.clear();
tempM.clear();
tempV.insert(1); tempV.insert(4);
tempM.insert(make_pair(5, tempV));
FinalMul.insert(make_pair(11, tempM));
tempV.clear();
tempM.clear();
tempV.insert(4);
tempM.insert(make_pair(9, tempV));
FinalMul.insert(make_pair(11, tempM));
tempV.clear();
tempM.clear();
tempV.insert(1); tempV.insert(4); tempV.insert(5);
tempM.insert(make_pair(2, tempV));
FinalMul.insert(make_pair(12, tempM));

Check this attempt:
typedef
set<int>
SET;
typedef
map<int,
SET>
MAP;
typedef
multimap<int,
MAP>
MULTIMAP;
// remove '4' from second column
for_each( FinalMul.begin(), FinalMul.end(),
[]( MULTIMAP::value_type
& mmv )
MAP & m =
mmv.second;
m.erase( 4 );
// remove '4' from third column and remove empty entries
for_each( FinalMul.begin(), FinalMul.end(),
[]( MULTIMAP::value_type
& mmv )
MAP & m =
mmv.second;
for(
auto i = m.begin(); i != m.end(); )
SET & s = i->second;
s.erase( 4 );
if( s.empty() )
i = m.erase( i );
else
++i;
// remove empty entries
for(
auto i = FinalMul.begin(); i != FinalMul.end(); )
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if( m.empty() )
i = FinalMul.erase( i );
else
++i;

Delete field value with DTW

Does anyone know how to delete a value in a field with DTW?
For example:
I want to use DTW to Update my BPs to delete the the Foreign Name for each BP.
Any thoughts?

Suda,
Thanks for the reply. That was my assumption, but I was hoping I was missing something.
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i.e. Deleting all BP Catalogs?

Everyone is how to delete repeating values?

There is a column,values are repeated,everyone is how to delete repeating values?
Assuming that this set of numerical many, can not directly determine whether there is a duplicate value.
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Message was edited by: Tao.
Message was edited by: Tao.

Hi Tao,
I've found that a short AppleScript provides a convenient way to identify duplicates (repeating values) in a range.
Just select the range of cells you want to check for duplicates and click. It will turn the duplicates red.
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SG

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Deleting peak values detected by peak detector vi

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