I was getting ready to upgrade to LV7.1 from 7.0 but have gotten
information from the Info LabVIEW Mailing List that some folks are
having problems with the install. One person reported receiving a
second LV7.1 package with a letter stating to destroy the first kit
and to reinstall if I was
Hi Michael:
Thanks for looking at this for me. The other issue is that when I use
the IMAQ VISION cross-correlation fx (which allows me to do direct
image correlations without having to do the fft steps), I get
different answers than what I get with my LabVIEW routines. I believe
that most of
I found two issues with my VI. I don't know why it ended up working
for you as is, but I got it to work after the following mods.
I placed a new invoke node (for 'Get Image') onto my diagram. It now
seems to work. The old invoke node when I upgraded from 6.1 to 7 had
a title of something like
I am also getting this identical objheap.cpp error at the same line
number 592. I was editing my VI yesterday on a computer using winXP
operating system. Today, I am trying to bring it up on win2K OS and
it will not even open due to this error!! I would like to send the
code to NI but it has a
Hello Franz:
I have contacted and left messages with the authors of the article
that I saw the formula in but your argument makes sense. I am
familiar with the FFT and correlation process and in fact we use the
hanning window to reduce the artifacts of the discrete fourier
transform just as you
Per one of the authors:
As for the nonsymmetry coefficient, this
integral is just a measure of the mirror symmetry of fcc around
taumax.
It would be zero if perfectly symmetric. The integration should really
be from 0 to +infinity, but as before, outside of some range of tau,
both fcc(taumax-tau)
This is an extremely good point and I need to contact the authors of
this article who first used the Nonsymmetry coefficient and determine
the correct usage. I guess the reason I assumed multiplication is
because the value of fcc at (tau_max - tau) over the period of the
integration can result in
thanks, i will take a look...The correlation fx uses the FFT so I
suppose if starting from scratch with the FFT and knowing the
algorithm for correlation, I can make the modifications as needed.
Cross-correlation involves multiplying the FFT of one fx by the
complex conjugate of the FFT of the
I tried that workaround and it did not work unless I made the main
panel a floating window rather than having default window behavior.
But I think we are thinking in the same direction.
I have noticed some strange behavior regarding windows management in
LV7 in winXP that did not occur in win2K (identical code).
My main front panel has 'default' windows behavior. I have a pop-up
subVI with 'modal' windows behavior so that it will be on top when
called. In win2K, works fine.
I am trying to programmatically delete (using the delete fx) a
config(.ini) file that was originally created using the
Open/Create/Replace fx. The file directory path is correct and the
file is closed prior to the delete operation. I get a file
permission error (8) when attempting the delete
The code is a subsection to source code of over 100 mb llb for our
ultrasonic scanner. I am trying to figure out a creative way to form
a simple version of the problem but whenever I craft a basic VI
utilizing the delete fx, the delete operation works just fine So as
of yet I am not able to
Is there any way (certain syntax needed) to get all files of specified
types to display in files portion of dialog when specifying multiple
file types (egs. *.png,*.bmp,*.jpg) for the pattern input in
Open/Create/Replace fx? When one specifies just one type (eg.
*.png) in the pattern input, all
Yes, thanks this works and I should have read the help for the
function more carefully.
I am answering my own question which is clearly addresed in the help
for the Open/Create/Replace fx. The items must be separated by
semicolons (not commas as I was doing).
When using IMAQ fxs (such as 'Write File') in subVIs, if one wanted to
use references to an image control, what property or method would be
used to feed into the image terminal in the imaq fx on the subVI? Is
this possible?
What did work: I was able to directly use the image control on the
main
Using Open/Create/Replace file fx, one can specify custom patterns
using the custom pattern input, and if only one type is specified, all
files of that type that exist in that directory path show in the file
section of the dialog. For example, if I use *.bmp as the custom
pattern, all files of
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