How come in frequency/ Time domain in a waveform graph there is no negative axis?

Hi guys!
How come when i m converting a graph never exists in negative domain?
Actually i m doing a tutorial of sine

duplicate
Message Edited by mathan on 05-08-2008 02:01 AM

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How come in frequency/ Time domain there is no negative axis?

Hi guys!
I m doing a tutorial to represent sine wave in its frequency domian? ALthough i get the 2 compoents from(exp(jwt)*cos wt) but all the frequency components are in positive domain???
Its completely different from what I had studided?
AM I wrong?
Pls correct... Learning in jeopardise...lolx..
Thank u!

See reply here: http://forums.ni.com/ni/board/message?board.id=170&view=by_date_descending&message.id=322149#M322149

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How come that the time machine backup takes 5 days to sync 200 GB over the ethernet?

I'm really not happy with the backup speed of the time machine. it has been 1 day and half that it is syncing and for now just 36GB are done of 210GB.
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How can I label the peak in the waveform graph!

Hello, my question is a little vague. I try to narrate it clearly.
Thank you for your patience!
I work with Labview 7.1. At a word, My question is how to label the
peaks when using the while loop and the event structure with
the dobule click event!
1.Open the Why.VI and execute it.
2.Click in the 'Acquire signal', then you will find two modes to upload
the signals, press the 'Read' button and ignore the 'Sample',since 'Sample'
mode need the support from the hardware, while 'Read' mode just upload file
from disk, select the 'Signal.txt'(inluded in the attachment), you will
find two waveform shown in waveform graph,just like 'Pic1.jpg'. Up to now,
there is no problem.
3.Press on the 'Analysis' button and enter a new interface. Amplify the plot
and selet the the a piece of waveform between about 3.02 and 3.06. Set the
x coordinate of the 'Cursor 0' as 3.03 and set the width as 0.01. Move the cursor
you will find two cursors(one vertical lines in yellow and another in blue).
Double click the graph and select 'valley', two x coordinate values corresponding
to the x coordinate of the two valleys are listed in the listbox. All above
mentioned is shown in 'Pic2.jpg'.
4.Let me explain my idea and my question now. What I have done is plot the waveform
when clicking in 'Analysis' interface;then, amplify the waveform, select
a certain area and move the cursors;at last, double click the graph, the waveform
between the two cursors are selected and the peaks are identified.But, what I need
next is to label the peaks in the graph as soon as I double click the graph,I
can not realize this idea because the waveform is out of the while event, the coordinates
of the peaks can not output until the while event is stopped. If I move the graph
into the while loop,the selected area can not be keeped because the while loop will
run continuously and will renovate the plot area to original area, but I want to keep
the selected area for got the peaks conveniently. In short, My question is about how
to label the peaks in the graph and keep the seleced area freely.
This problem has puzzled me for a long time. May anyone give me some advice.
Thank you for patience and really appreciate your help!
BTWlease let me know if the VI can not run well!
Attachments:
Calculate velocity.vi ‏271 KB
why.llb ‏389 KB
Acquire.vi ‏213 KB

Sorry, I try to compress the files in '.rar' ,but it is compatible with the web,I have to
upload them in reply file.
Attachments:
signal.txt ‏684 KB
Save file.vi ‏103 KB
Get Waveform Time Array(0).vi ‏46 KB

How to use offset and multiplier property in waveform graph?

hello,
i m using a waveform graph and wanted to update its x-axis scale depending on the multiplier value. Also how this
formula of offset n multiplier works (deltaX)*X+X0? What is delta X and X?
Regards,
vijtin
Solved!
Go to Solution.

hi,
X0 is the offset and X is the multiplier. So the graph will start at a cetain offset and will aa to that the delta value times the multiplier.
e.g.
If you would have these normal X-values : 0 ; 1 ; 2 ; 3 ; 4 ; 5 and a multiplier of 2 and ofset of 5 you would get the result on the X-as = 5 ; 7 ; 9 ; 11 ; 13
Hope this helps
Kind regards,
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Have fun using LabVIEW... and if you like my answer, please pay me back in Kudo's
LabVIEW 5.1 - LabVIEW 2012

How to have a vertical grid lineon the waveform graph indicator for every 10% percent of the maximum X axis value?

Hi,
how to have a vertical grid line on the waveform graph indicator for every 10% percent of the maximum X axis value, so the x axis will split into 10, the vertical grids line in total will be 11 (including first and last)
Example if the maximum X axis value is 11.56, first vertical grid is at the origin(0), second vertical grid is at 1.156 and continue to last one 11.56

Thanks JohnM and Evan,
the increment work great and i modify it to pass the 10% into "start" too, so it will start at the point of 10% of maximum range
attached file to let people download in future, if they met the similar situation
Attachments:
10percent.vi ‏31 KB

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How can I customize the scale of my waveform graph to suit my waveform?

I am trying to display a sinusoidal waveform on a waverform graph. I want to make sure that the graph displays only 5 cycles of the sine wave and thus changes the x-axis scale accordingly. Hence this would mean that me plot remains the same no matter what the frequency of sine wave I input, only the scale changes. How can I do this? Also once this is done, is there any way in which I can manually change the scale while labview is running to change to plot?

Here is an example that changes the scale of a graph. I think it is what you are looking for. Post back if it is not.
Bob Young - Test Engineer - Lapsed Certified LabVIEW Developer
DISTek Integration, Inc. - NI Alliance Member
mailto:[email protected]
Attachments:
Update_graph_scale.vi ‏40 KB

How can I add custom captions to a waveform graph scale?

I have an application that displays one or more signals in a WvfmGraph. The X Axis is set by a hardware encoder giving signals vs. distance (measured length). I would like to change the caption of the XScale according to the values of one of the signals. Its similar to an XY graph, but differs in that I want to see the data unrolled.
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For example, measuring a unit 100 feet long results in measurements of 200 feet worth of data (out and back). The customer would like to see this data unwrapped 0, 50, 100, 50, 0.
One alternative is to use an XY Graph, but the data on top of itself. Not necessarily a bad thing, but not the same as what they have always had.
I found a similar post to display the scale at a rotation (CW or CCW) and was able to get it to work for my specific case. The problem is that my picture marker values are not aligning nicely with the corresponding gridlines.
Attachments:
Position vs MeasuredDistance.PNG ‏43 KB
Position vs. PseudoPosition.PNG ‏37 KB

Stephen,
Thanks for replying to my post. XScale.Range does not handle this situation. In "rigorous" terms, LV does the right thing with X axis scale markers and put them where you want. I tried to set custom Marker values as: {0, 50, 100, 50, 0} and only saw the first three values. My guess is that under the hood, the spacing is set to 'Arbitrary' and my custom values are overwritten. Not what I intended, but I admit my task is not the normal use case.
Today I am prototyping the entire application with each WvfmGraph replaced with XYGraph's. Good thing I used a modular design and passed Refnums around to all my subVI's. Depending on a review of this prototype, I might skip this graph scale formatting.
FYI, the original graph issue wanted to rotate the marker labels CCW. They hid the graphs XScale and used a custom picture to display the new scale. There is a VI that formats an axis with custom labels, where the font, text, etc. can be customized. I have a working example of that custom scale on a Wvfm graph. I stopped refinement when I tried to consider use cases for how the user would zoom on the data, how the graph's label's would appear if the DAQ signal indicated that the part reversed on itself. All the data is better visualized on an XY Graph.
p.s. are you one of the Waterloo Labs engineers? Great stuff!

RE: date-time domain overhead in express queries.

DateTimeData objects in Forte are inefficient, both in terms of memory
footprint and instantiation speed. My understanding is that it stores
different parts of the date as separate textdata sub-objects.. Large
footprint also means they take a long time to pass across the network.
We rarely use DataTimeData or any related "domain" type objects. We have
our own date class which stores the entire date and time in a single string
attribute.. Much faster, much smaller footprint, etc. Fetches from the
database use a "to_char(...)" approach to format the date from the database
directly in to the internal string attribute in the correct format, again
for speed..
-Greg
-----Original Message-----
From: Jones, Kerreck [SMTP:[email protected]]
Sent: Tuesday, January 19, 1999 11:36 AM
To: '[email protected]'
Subject: date-time domain overhead in express queries.
In our application, we have an outline window which displays 11 fields, 3
of
which are date time domain.
Our database currently contains about 1500 entries, and the query takes as
long as 70 seconds. If we
remove the DTG domains from the application model, then the query takes
only
35 seconds. Is there any
known problem with the overhead of the express date time domain when doing
queries?
Thanks in advance for any info.
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
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I have considered this but have not found an elegant solution to the
problem of working accross multiple time-zones.
The application I am working on will ultimately need to work within Europe,
potentially servicing multiple time zones. By converting the date to a
string we lose the time-zone conversion that Forte does when an object
moves partitions and this is likely to cause problems as we then have no
"central" point of application time. If this is not a problem for you then
I would use strings as much as you possibly can.
If anyone has any thougths on how I could use scalar's in this case I'd be
interested to hear them. I've thought about forcing clients to "register"
with my central clock and then doing conversions behind the scenes but it
seems a bit inelegant.
However, one thing cannot be emphasised enough. Using the simple object
types (TextData's, IntegerData's etc) as class attributes is a really bad
idea, and will give you a number of performance penatlies.
Serialisation/De-serialisation of objects is really slow when compared with
scalars.
Scalars take up no 'object space' so you save on garbage collection.
Scalars are tiny when compared with their object equivalents.
Hope that helps.
From: [email protected]
To: [email protected]
Cc: [email protected]
Subject: RE: date-time domain overhead in express queries.
Date: 19 January 1999 18:22
DateTimeData objects in Forte are inefficient, both in terms of memory
footprint and instantiation speed. My understanding is that it stores
different parts of the date as separate textdata sub-objects.. Large
footprint also means they take a long time to pass across the network.
We rarely use DataTimeData or any related "domain" type objects. We have
our own date class which stores the entire date and time in a singlestring
attribute.. Much faster, much smaller footprint, etc. Fetches from the
database use a "to_char(...)" approach to format the date from thedatabase
directly in to the internal string attribute in the correct format, again
for speed..
-Greg
-----Original Message-----
From: Jones, Kerreck [SMTP:[email protected]]
Sent: Tuesday, January 19, 1999 11:36 AM
To: '[email protected]'
Subject: date-time domain overhead in express queries.
In our application, we have an outline window which displays 11 fields,
3
of
which are date time domain.
Our database currently contains about 1500 entries, and the query takesas
long as 70 seconds. If we
remove the DTG domains from the application model, then the query takes
only
35 seconds. Is there any
known problem with the overhead of the express date time domain whendoing
queries?
Thanks in advance for any info.
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
Searchable thread archive<URL:http://pinehurst.sageit.com/listarchive/>
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
Searchable thread archive <URL:http://pinehurst.sageit.com/listarchive/>-
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
Searchable thread archive <URL:http://pinehurst.sageit.com/listarchive/>

How come in frequency/ Time domain in a waveform graph there is no negative axis?

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