Plot data with absolute time

Why is it that when I plot an array of data to a wavechart and changed the time (x axis) to absolute time, it always display 12/31/1903? Thanks,

Have some patience, most people don't necessarily rush to the internet on the weekend.
To answer your question, LV's time data is represented by the complete number of seconds that have passed since 01/01/1904 00:00 GMT. That means that the number 0, timewise, is that time. Since you are west of Greenwich, you get december 03.
You need to set the starting time for your chart as the current time. You may also need to set the space between each 2 points you plot to the chart. You need to create a property node. Right click on the control or the terminal and select Create>>Property Node. Then, Find the X-Scale>>Offset & Multiplier properties. These set what you need. For offset you should set the current time when you start (use To DBL to convert) and for multiplier the plotting loop speed in seconds (100 ms is 0.1).
Try to take over the world!

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[svn:osmf:] 15680: This submission tries to address a bug with absolute time support.

Revision: 15680
Revision: 15680
Author:   [email protected]
Date:     2010-04-23 16:36:42 -0700 (Fri, 23 Apr 2010)
Log Message:
This submission tries to address a bug with absolute time support. As a result, it fixes a bunch of bugs as follows:
FM-765, FM-766, FM-776, FM-777, FM-778, FM-779, FM-780
Ticket Links:
    http://bugs.adobe.com/jira/browse/FM-765
    http://bugs.adobe.com/jira/browse/FM-766
    http://bugs.adobe.com/jira/browse/FM-776
    http://bugs.adobe.com/jira/browse/FM-777
    http://bugs.adobe.com/jira/browse/FM-778
    http://bugs.adobe.com/jira/browse/FM-779
    http://bugs.adobe.com/jira/browse/FM-780
Modified Paths:
    osmf/trunk/framework/OSMF/org/osmf/elements/f4mClasses/DVRInfo.as
    osmf/trunk/framework/OSMF/org/osmf/net/httpstreaming/HTTPNetStream.as
    osmf/trunk/framework/OSMF/org/osmf/net/httpstreaming/f4f/HTTPStreamingF4FIndexHandler.as

Have done.... I had also sent a copy of the AB database to support on another case using Snow Leopard. I had hoped it was fixed in Lion.

I have a string 2012-05-22T23:23:42.263-07:00. so i want to convert in date with indian time zone can any one help me out

i have a string 2012-05-22T23:23:42.263-07:00. so i want to convert in date with indian time zone can any one help me out

What does this have to do with iPhone tech support?

Save waveform data with corresponding time array to spreadsheet file

Hello to all
I am looking for a possibility to save voltage data acquired and displayed continousely to a spreadsheet file. Acquiring and displaying is not a big problem, but I have troubble to save the data with the corresponding timestamp with more than seconds accuracy. I am acquiring the data at 1000 Hz and read packages of 500 samples. The recording time should not be limited, it will be started and stopped manually. In fact the acquired voltage data first has to be scaled and than saved. If I use the 'WRITE WAVEFORM TO SPREADSHEET' VI the time column is in seconds' accuracy and that is not what I need. If I create my own time array from the waveform parameters I have timing problems. The accuracy in time should reflect the sample rate. I will attach one of my not very successful trials for better understanding.
please help a newcomer!
Thanks in advance
Thomas
LV 7.1
Attachments:
display & record forces v.1.0.vi ‏181 KB

I usually follow a simple method to generate time stamp
I keep sampling rate and number of samples to read as equal and do as shown in the attached VI
I also remember building a VI with a small modification to this time stamp generation logic to cater to acq, where number of samples to read is half/one fourth/one tenth of sampling rate specified, but cannot find that VI.
Hope this helps
Regards
Dev
Attachments:
Acq_DAQmx_filesave_time stamp.vi ‏121 KB

How to combine sql.Date with sql.Time into one?

I have a database where I keep dates and times separately, and getting date only and time only out of a java.util.Date is no problem thanks to the classes java.sql.Date and java.sql.Time. However, I need to read these values back in, put them back together, and then do date comparisons with java.util.GregorianCalendar. I tried just adding the millisecond long values together but that didn't seem to work, and I've tried setting the year, month, date, hours, minutes and seconds individually into a GregorianCalendar but I haven't figured that out yet. Certain queries work out better keeping the date and time separate in the database and it takes less bytes than a timestamp, so please don't suggest I use a timestamp!
Thanks for your help!
Stephen

You can add the milliseconds (ms), but you need to use just part of it. For this example, let X be one more than the maximum number of units in time and also the minimum number of units in date. If we were using hours instead of ms X would be 24.
t = total ms from time
d = total ms from date
T = new combined time
T = ((d / X) * X) + (T % X);Add (the date, rounded to the nearest day) and (the portion of time which is less than a day).

Multiple channel data with different time stamp logging

I have peaks and valleys from multiple channels with different time stamp but I am not able to log to a single file. Any idea on how to do this?
Attachments:
Single Point Peak Valley Log.vi ‏53 KB

Hi Dennis,
Sorry for that I have modified the VI.
Because the peak and valley of every channel will occur at different time and I want to log the peak/valley with the time stamp.
How can I log them on the same file.
Attachments:
Single Point Peak Valley Log_Mod.vi ‏53 KB

Plot numeric waveform with absolute time

Hi all,
This code was working with Labview 2009, but it doesn't seems to work with 2010, do I make something wrong ?
Regards,
V-F
Attachments:
waveform graph.png ‏29 KB

Hi ramses64,
I set up a complete new system.
Then I first installed LabVIEW 2009 (without any Patch)
==> See Screenshot "LV2009_Test.jpg"
Afterwards I installed F3 patch
==> See Screenshot "PatchF3 Update.jpg"
At least I tested your example with LabVIEW 2009 F3
==> See Screenshot "LV2009F3_Test.jpg"
Somehow it doesn't work.
Because of that, I can't go to R&D and show them that behaviour.
Regards
Dippi
Attachments:
LV2009_Test.jpg ‏153 KB
PatchF3 Update.jpg ‏170 KB
LV2009F3_Test.jpg ‏155 KB

Writing arrays to text data with continious time stamp

Hi Friends,
I have the following problem.
I want to create a text file looking like this:
12,30,10, 10:30:00 12.05.2007
12,31,10, 10:30:00,1 12.05.2007
12,32,10, 10:30:00,2 12.05.2007
12,33,10, 10:30:00,3 12.05.2007
12,34,10, 10:30:00,4 12.05.2007
12,35,10, 10:30:00,5 12.05.2007
12,36,11, 10:30:00,6 12.05.2007
12,37,12, 10:30:00,7 12.05.2007
12,38,13, 10:30:00,8 12.05.2007
12,38,16, 10:30:00,9 12.05.2007
12,39,18, 10:30:01,0 12.05.2007
12,39,18, 10:30:01,1 12.05.2007
12,39,18, 10:30:01,2 12.05.2007
the first 3 values are read from a file ,recorded as array and than plotted in chart.
the beginning time (e.g 10:30:00 12.05.2007) is also read from a file and set as beginning of the chart with a property node. The problem is here , after I set the beginning time to the Chart I have nothing to do with it for the rest values, since samples/sec is also sent to chart.
So how can I write the a txt file including the time stamp with ms incrementations?
Thanks alot for your responces.
john

Hi John.
I would use a Time Stamp and "Format Into String" with e.g. %<%.1X>T.
Syntax details are in the LabVIEW Help - Search for "Format Specifier Examples".
Regards, Guenter

Merge my new MBPr data with old time machine back up

Got a new Macbook Pro retina, can I merge my old data (from my old imac using time machine ) with my new macbook retina data without loosing data from my MBPr?
I used my MBPr during holidays without having the opportunity to restore my backup from my old imac and now I have information/data I do not want to loose. If I just restore my back up from time machine (of my old imac) won't I loose any new information on my MBPr that I have not backed up (e.g iphoto or imovie data) ?
PS: I havent yet backed up my MBPr as I am afraid of overriding my old imacs back up

Put all of your data from your 'old' user into your Shared folder - accessible by any user. Then you can copy it into your new user folder(s) and delete the old user if you wish.
Good luck,
Clinton

Saving data with automatic time intervals

Hi everyone
I am a new user with LabVIEW (I just started using it 3 weeks ago) and I am having a problem with data recording and saving.
Basically, what we want to do is to monitor data for four different variables countinuosly but saving them in automatic and specified time intervals. Specifically, we would like to save data countinuosly only for five minutes each hour. After the 5 minutes, only the saving function must be stopped for 1 hour then return to record for 5 minutes without shutting the major loop. Additionally, we would like to collect all the data in this way in one exel file per day for three weeks or more, so instead of creating a data file for each recording we would like to collect them in only one file per day.
Finally, if its possible, we would like to extract the mean of the data for one day in a single file. We are not interested in modifying the rate of data aquisition, we only want to focus on the saving rate. We tried many timed function (as Elapsed time, Time delay, Wait) and timed loops but it was impossible for us to syncronize different loops or to set up timing function for the saving issue without blocking the main loop work.
Data are collected throught the "write to measurement file" function.
any kind of help will be really appreciated!
Here we submit our front panel and block diagram of our VI.
Best regards
Solved!
Go to Solution.
Attachments:
Hypoxia 21-05-2014 Monitoring.vi ‏451 KB

Use a shift register to keep track of your start time. If the difference between the start time and the current time is less than 5 minutes, save the data. If the time difference is an hour, save the new time as the start time.
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Prob with absolute time

Hii everyone....
I have some questions to ask to u guys...firstly, I'm using serial comm to interface data into labview...There is no prob for configuration...but I have 2 mistakes here.1stly, refer to my table.PNG...I build the table using build table express...so..I enabled the date time.When I run the prog...the date/time didn't fuction anymore...It seems like its stuck with the first read...so...i have tried to open the front panel of the build table express to modify n try to put time stamp..but I think that there is no need to replace it because it had Gate waveform time array.vi already...I tried the other basic simulation to confirm it...but the date from table will run also after I start to run the other prog.
And the other mistake about write to measurement file..the situation was same as above that I tried to show the elapsed time or fractional seconds in the text file at the left side...but it did not happened.that means the fractional seconds always shown as 0.0000 till the target time...
And my last question it...How can I put a gauge and link with the waveform?because here I can't link this gauge icon with the waveform...and lastly,How could I change universal time format of x-axis from the waveform to current time...thank u very much...
Attachments:
text file.PNG ‏32 KB
IIOA test45.vi ‏188 KB
table.PNG ‏57 KB

oh...i'm sorry dennis..i almost forget these thing.Here, I attached my vi n PNG file. Actually I put the gauges 4 my data from my waveform.I think it can be linked with signal without any prob.So, I didn't know that this function just a scalar input. So refer to my table2 PNG. the date / time did not run properly n stuck with the first time/date data...thank u very much
Attachments:
IIOA test518.vi ‏247 KB
table21.PNG ‏35 KB

Plotting data with multiple y-axis using waveform chart

I am using LabVIEW 7.1 and am simply trying to split my data on one waveform chart using 2 Y axis. One goes from 0-150 and the other from 800-1000. I want them to graph on the same chart, and I have selected 'duplicate scale' when I right click on the chart, as instructed in the labview manual, but both of my data streams are still only connected to one of my axis. I can't get it to recognize that one data stream should go on one axis and the other stream should go on the other axis. Can someone help please?

Right-click in the plot legend one plot. In the context menu select y-axis and after the axis you want for this plot. The scale is changed directly.
There is an image of the context menu attached.
I hope this helps
Greetings
shb
Attachments:
two y-axis.png ‏16 KB

Update time and date with server time..?

Hi.. All
every login ,flash get server time from php. how can i update time and date in flash..?

I'm going to only show the month example, the rest is fairly straightforward:
<?php $month = date('n'); ?>
var date:Date = new Date();
trace(date);
date.setMonth($month);
trace(date);

How to schedule with absolute time

Hello,
How can you schedule a task to execute at 4:35 p.m (according with the system's clock) every day.
There are two classes that permit to schedule periodic tasks specifying the initial time and the period or delay for subsequent executions.
These classes are:
java.util.Timer
java.util.concurrent.ScheduledExecutorService
I could use these classes with an appropriated initial delay and a delay of 24 hours.
But if the system time changes, there will be trouble:
Example 1: if the system time changes because the Daylight Save Time rules, the task will not be executed at 4:35 p.m (system's time).
Example 2: if some person changes the system time, the task will not be executed at 4:35 p.m.
Some suggestions?
Thanks.

JoseLuis wrote:Hello,
How can you schedule a task to execute at 4:35 p.m (according with the system's clock) every day.Are you saying that the task needs to be executed at 4:35pm everyday even if the DST has kicked in? Or do you mean after DST kicks in, the task should be executed at the time 5:35pm (in relation to the time before DST)?
Example 1: if the system time changes because the Daylight Save Time rules, the task will not be executed at 4:35 p.m (system's time).
Example 2: if some person changes the system time, the task will not be executed at 4:35 p.m.
Some suggestions?
Thanks.You can synchronize time on a machine to get updated with the world clock. Double click on clock at the bottom of your screen.
Unfortunately, I am not an admin on my machine right now to give you the specifics.

DST setting for absolute time in waveform graph

I am using a waveform graph to display some pre-recorded data, with absolute time on the X-axis.
If the time period of the data includes the point at which daylight savings time changes, then this comes out correct on the X-axis i.e. there is a one hour jump in time on the X scale.
But this is only correct if the data is recorded in the same time zone with the same DST settings as the computer used to display the data. If I am viewing data that was recorded in another country, the time on the X scale can come out wrong.
Is there any way to get the graph to ignore the DST setting, so that I don't get the one-hour jump on the X scale?

Hi Scott,
Thanks for your suggestions.
I actually prefer relative time, but other users wanted absolute time so that is why I put it in.
Most of the time it is not going to be a problem - the data is usually analysed by the same people who recorded it, so the times will always come out correct.
But we do have collaborations with people in other countries and swap data files back and forth, so it could get connfusing if the times come out different in different countries.
It would be nice if I could somehow tell the graph what timezone the data was recorded in, and it would display the time correct for that timezone. This would save me from having to change the timezone setting on my computer all the time. But in the mean time, that is what I'll do.
Many thanks,
Mark.

Plot data with absolute time

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