Editing the waveform graph

Hi,
I have encountered some problem is finding waveform graph. I downloaded the tutorial for ASK modulation i tried to do a new one as practice. But the graph are very different. it seems that the borders are transparent which can only see the graph portion only. I have tried to use waveform graph from the graph palettes. I edited it by stretching the graph (waveform result) area and unchecked the visible plot legend, scales and etc.. but i just can't do it the same as the example and the waveform at the bottom is slightly different also (but i don't know isit different scales). I have no choice but copy the graph and paste on mine. Anyone know the trick or tips in doing it? Thanks..
Attachments:
ASK.vi ‏53 KB
simple_ask_transceiver (SW).vi ‏172 KB
Image.PNG ‏21 KB

Hi Serina,
have you tried to use the waveform graph/chart from the "Classic" palette?
Those controls/indicators have a "flat" look making a lot easier to hide unneeded features
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

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How to change the display in the waveform graph to enable higher frequency displays.

I am working with waveforms of very high frequencies upto 2MHz. When the frequency of the waveform is increased above 500Hz, the display in the waveform graph goes blank.
Please help me.
Thanks

Dear Labviewguru,
Thanks a lot for your response.
The problem had been technical, and it has been solved.
Actually, I didn't specify the number of samples while generating the waveform, so only frequencies upto half the default value (1000) were being displayed.
Regards,
Roopa

Is there a way to change the time of a saved data to be as the same as the time-axis of the waveform graph?

Hi,
I've a problem while saving the waveform to a spreadsheet.
The problem that I'm facing is that I'm not able to save/change the time-axis of the waveform graph into the excel spreadsheet.
The attachments below are what I've programmed on.
1st file that would be asked to save is the results of the waveform.
2nd file, supposing to be the time-axis
3rd file, is the multiplication of results of CH 1 and CH 2.
Would be glad if someone can enlighten me with a solution which is suitable for LabView version 8.2 and Tektronix DPO 72004.
Thanks. ((((:
Attachments:
Modification of 2 CH waveforms (Multiply and Sum).vi ‏63 KB
Modification of 2 CH waveforms (Multiply and Sum) Front Panel.JPG ‏220 KB
Modification of 2 CH waveforms (Multiply and Sum) BD.JPG ‏92 KB

I've saved it as text file which could be read if I open it with excel spreadsheet.
My aim is to get the time-axis (x-axis) in the file rather than to get the date and time in the file.
The attachment is the waveform results that I've obtained.
Attachments:
waveform vaule.txt ‏433 KB

How the waveform graph indicator doesn't change its property ?

I have designed a printcontrol vi which I only want to print the plots in the waveform graph on the front panel.In order to acquire this effect, I use the property to set the plot area background colour to transparency. In the course of running,the property works,
I mean the waveform graph changes transparent.But I hope it will not change because it will not convient for the user.I don't know how to achieve this goal.Hope to get your help,thanks a lot!
Attachments:
11.vi ‏97 KB

One of your problems is the fact that you reset the panel color only after the event has completed and since it generates the full report, this can take some time.
The problem will be much less noticeable if you reset the changed properties right after grabbing the image.
Attached is a quick draft. Modify as needed.
(Sorry, I don't have 7.1, so I downconverted from 8.0. There could be some conversion errors that should be easy to fix.)
You should also make sure to place the terminals of the latch action booleans INSIDE their corresponding event case, else it might not reset to false during execution of the event.
LabVIEW Champion . Do more with less code and in less time .
Attachments:
11MOD.vi ‏58 KB

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

Acquire sound data time does not match with the waveform graph

i am doing a basic data logging system to see the frequency behavior of sound. What I did is to use the "acquire sound" system of Labview and connect a waveform graph to see the time-domain behavior of sound.
However, if I input a duration of 4 seconds (or any time), I will only see 75% of the sound (that is 3 seconds). I tried to extract the values using write to file to see if the waveform graph is the one who have the delay. however, the data also showed me 3seconds.
I will attach here the picture of the simple program i created.
I hope someone can explain to me why this happen.
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Hi all,
have you find a fix for this issue? Im facing the same situation, using Complex type, and String data type both in the service and Bi publisher. We are consuming CC&B services, and we have noticed this error appears when BIPublisher is running on WebLogic (10.3) but it does not appear when BIPublisher is running on OC4J , of course running the same report on both application servers.
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How to change the waveform-type inside of the waveform graph from int to double?

Hello,
attached you find a vi with two waveform-graphs.
When i rightclick them and select "create constant" then it creates the constant.
The difference between the two graphs is, that one creates a double-array inside the constant and the other graph creates an int-array inside
The question is: Where can i change inside of the int-graph that it also creates a double-array in the constant?
(Problem is that all double-waveforms send into this graph are changed to int and rounded in the display)
Thanks for the help
Attachments:
waveform.vi ‏27 KB

The datatype of a chart or graph is determined by the last thing you wired to it. By default, they are simple doubles or arrays of doubles. My guess is that you first wired a waveform with an integer data type to the graph. It should switch automatically to a double waveform graph if you wire a waveform which contains double data to it. If it does not, that is probably a bug. If you have a VI in this state, please post it and I will report it to R&D.
Thanks!
This account is no longer active. Contact ShadesOfGray for current posts and information.

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
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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!
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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

Center the cursor on the Waveform Graph?

I have a waveform graph where the user can adjust the scale on both the X and Y axes. The "problem" that I am having is that if the scale's range is set too far from where the cursor is at, the cursor will be off screen and not selectable. So, I am trying to center the cursor to the scale when the scale is changed or via a button. Here is the code that I have written for one of the Cursor plots:
Select Case setBlueCursor
Case 1
blueCursorPt.Plot = plotInlineTorque
inlineTorqueMax = yAxisInlineTorque.Range.Maximum
inlineTorqueMin = yAxisInlineTorque.Range.Minimum
blueCursorStartY = (inlineTorqueMax + inlineTorqueMin) / 2
blueCursorStartX = (XAxis.Range.Maximum + XAxis.Range.Minimum) / 2
blueCursorPt.YPosition = blueCursorStartY
blueCursorPt.XPosition = blueCursorStartX
This code will center the cursor like I want but then I can't move the cursor after that as it is "stuck" at the position that I have coded it. The problem appears to be with the last two lines of code here. I do not know of any other way to do this though. I have tried the "moveCursor" method but the end result ends the same way, with the cursor stuck in the center and can't move. Any help on a solution? Is there a better, easier way to do this? I'm new to Measurement Studio and .NET.
Thank you

This code works. It appears that I was calling the subroutine that this code is located in over and over in another part of my program.

Why am I not seeing the LED blink faster on hardware when the waveform graph shows the signal updating?

I am using the cDAQ-9188 chassis with a NI 9476 in the 8th slot, and when I run my VI, the waveform gets updated if I change the frequency of a signal while the program is running, but the DO from the write does not get updated. I thought that write takes in the data from the digital waveform input, so I'm confused as to why the digital waveform indicator is updated with a new signal, but my LED into a DI module (9421) is not updating.
Thanks in advance for any tips and suggestions!
Speed2.vi calls Generate_PWM.vi, so Generate_PWM is a subVI inside Speed2.
Attachments:
Generate PWM.vi ‏34 KB
Speed2.vi ‏46 KB

Hi Ruthnan,
Sorry for the delay in response but after looking over that hardware it seems there should be enough counters in the chassis to support what you are doing. I believe you are getting the resource is reserved error because you have started one output task on that module thus reserving the reference. Once that task starts any additional task with get an error. It should be possible to use more than one counter in your application but it sounds like an error in the VI configuration. I am happy to help here to get an example up and running but I think it would be faster to open a service request for this issue. Let me know what you would like to do.
Patrick H | National Instruments | Software Engineer

Editing the waveform of a MIDI sound

Hi all,
I'm trying to edit one of the MIDI sounds, specifically, I want the sound to cutoff sooner rather than having it linger.
What is the best way to do this?
My initial thought is to convert the software instrument (MIDI) into a wave file, then edit that wave file by deleting the "lingering" portion of the sound so that it cuts off the way I want it to. Then I can just paste that sound into the (not sure what it's called exactly) window that has all the tracks. It'd be even better to be able to assign that small wave file to a key on my MIDI controller. I've done something like this on Garageband so I assume it's possible to do on Logic.
Any help on how to pull this off with something similar to what I described above? Or even better, is there a simple way to do this? Thanks!

Hi
What Instrument are you using to create the 'sound'?
Most of Logic's Software Instruments have an 'Envelope' section. This is where you can adjust the ADSR of the sound (Attack (lead in), Decay, Sustain (how long actual sound lasts for), Release (length of trail...).
Here are some ways:
You can use the Sustain & Release parameter in the plugin to adjust the length.
You can use Track Automation and volume to cut the sound out too. (View > Track Automation, draw nodes for Volume, drag lines to create a fade out).
You can use Hyper draw (Region based automation) to do this.
You can bounce the MIDI region to an audio file (Solo track, File > Bounce), import audio file and in Sample Editor use the fade out function. (This destructively edits the audio file).
You can bounce the region to audio and in the Arrange area use the fade tool to non-destructively add a fade to the end of a region. Then use the Automation Curve tool to add a curve shape to the fade out.
There are many ways to do this
JG

How can I get the cursor value from a waveform graph

Is there a way to get the value of cursor position on the waveform graph so mathematical calculations be performed on those values. We can see the value in cursor legend, but can we extract those values for future calculations in the block diagram somehow.

Right-click on the waveform graph icon. Select Create>Property Node>Cursor>Cursor Position. That spits out a a xy cluster for the current cursor position.
If you have more than one cursor, you can either set up a loop and set the Active Cursor property node (right click the property node and select "Change to Write") or you can pull everything you ever wanted to know about every cursor with the Cursor List property node.

How do I Get the value from a mouse click - on a waveform graph?

If I have made a plot into a Waveform Graph and later want to do a zoom of my data
(Not zoom into the Waveform Graph, but regenerate the data). How do I read the mouse
coordinate if I click on the graph window. I know how to put up the horiz and vert
cursors but don't know how to just read the mouse click. I would really like to
follow the windows standard that identifys a rectangle by clicking and draging and then
be able to read the corners of the rectangle. Thanks, Rick
PS: Using Labview 6i

I would recommend to 'translate' your graph in a picture and dislay it in a picture control (see picture examples in LV6).
Once you did it, pictures have an extremely useful property called Mouse that returns the mouse coordinates and click events when you place the cursor on the picture.
By this you can re-arrange the graph on picture appearance.
There are also other methods such as using a Window's API that returns the mouse position referred to the whole screen window, but I believe this would be much more difficult to implement.
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Good luck,
Alberto

I would like to see the time in a waveform graph (real-time)

i need the x-axis of the waveform graph to show real time (from the computer clock). I have made a program with all the example. He read and log data when the chosen time has elapsed. the program work's well...but i dont't know why the x-axis blink every time he draw a point
i can see two x-axis in the same time.
i give you a picture of one of a part of my program, i hope someone can help me
Attachments:
my_software.JPG ‏128 KB

Hi,
I tried to reproduce what you were getting by building a simple VI but I havent had much luck (I have attached the VI).
Could you post your code so that I can take a look at it?
Feroz P
National Instruments
Attachments:
Graph.vi ‏39 KB

Dispaying a waveform graph with control of the cursor in the document.

I would like to be able to control the cursor when I save my waveform graph in html. I'm currently saving the graph through the report vi's

I am not sure I understand your question. Do you want to simply control where the cursor is on the picture you are appending to the html report. If so then when you use the Append Control Image to Report VI it basically takes a snap shot at that moment and displays it. Therefore you just need to place the cursor where you wnat it before you add the image.
To programttically control the cursor you will need to use property nodes of the Waveform Graph. A good start would be the property cursor>>cursor position>>all elements.

Editing the waveform graph

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