entrance to mar Lev constant

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• LV lose bytes (once?) in the process of loop

  Hey dear community NOR!

  I lose bytes... and I guess, I do it during the first loop of my program.

  The .vi is attached below. Here is a screenshot of the block diagram and the 'live feed' monitor the missing bytes (after explanation):

  

  Here's how the program works:

  My Arduino Mega2560 sends the data of 16 pins + chain marker 'xx' in a continuous cycle. Now, I want to follow those pins.

  1-34 (= 16pins * 2 [bytes] + 2 ['xx']) bytes are read and checked for the sequence "xx".

  2. the index of the first character after "xx" determines how much more bytes are to be read before our loop begins. (The purpose behind this is to have the 34-byte-strings during each loop begins with 32 followed data bytes the bytes of the 'xx' marker.)

  3. the loop takes 34 bytes and evaluates the first two bytes for the value of the first pin.

  The 'before the correction of the loop' shows that the used string ends with 'xx' just before the beginning of the loop. Measure the loop bytes with 'live feed' displays however data, where 'xx' is not in the end, makes the assessment of my impossible. (Note: 'xx' in hexadecimal display '7878', then the string of bytes in the above image is disabled by a single byte.) Also, note that once the program is started, the false '7878' position remains the same, as if the byte loses occurce once.

  Any ideas?

  Kind regards

  Froebel, Friedrich G.

  PS: The Arduino Mega2560 is running at 38400 baud. Higher values are not accepted. Do you know why or how I could solve this problem?

  Friedrich,

  The default value for VISA configure Serial Port is to terminate readings with a stop = 0a = newline character. Any time a 0a occurs in all of your data, the reading will be terminated without expectation of 34 characters. Solution: wire a False entrance to stop character constant allow the upper part of Setup.

  Or you can change the stop character to be your character of marker (such as discussed in your other thread).

  Lynn

• 2D adapt: a question to Mr altenbach

  Dear Altenbach,

  I started looking at all your posts on form 2d (the oldest is in 2004) and I downloaded all the files 2Dquadratic, planefit, 2Dscatterfit2, 3Dpolyfit, XuFit_004. Also, I read this https://decibel.ni.com/content/docs/DOC-30394

  Ok... I'm completely lost.

  I would ask you where your files, I should start. I want to ride with the function z = a + bx + cx * 2 + dy + ey * 2 + fxy (second order polynamial) a set of experimental data (x, y, z are the experimental data, these are all vectors 1 d with the same dimension, in addition, they are very large vectors on the 100000 entries each).

  I did not understand:

  (1) what is the difference between mesh and scattered data.

  (2) If you are suggesting the polynomial form (build the H matrix) or climb the Mar Lev.

  I also ask you if there are more recent vi from, because the 'old' are very very difficult to understand.

  Thanks in advance

  Use the most recent one. Some of the old examples use homemade, pre LabVIEW 8.0 subroutines.  Editing tools has received a major overhaul with LabVIEW 8.0 and should be used out of the box.

  gnappo wrote:

  I would ask you where your files, I should start. I want to ride with the function z = a + bx + cx * 2 + dy + ey * 2 + fxy (second order polynamial) a set of experimental data (x, y, z are the experimental data, these are all vectors 1 d with the same dimension, in addition, they are very large vectors on the 100000 entries each).

  Because your problem is linear in coefficients, you must use the general linear adjustment, building the matrix H of the terms. No need of iterative procedures such a lev - mar. create your H matrix with various conditions for each pair of xy.

  Gridded data mans that x and y values form a rectangular grid with no missing values, i.e. the 2D data can be represented as a simple 2D array. The scattered data means that there is a list of (x, y, z) points and x and there is not evenly spaced. You can run this in both modes to immediately see the difference.

• Problem: Fitting Lev - Mar with error function

  Hello world

  I have very little experience with LabVIEW and I try for the first time to do some non-linear curve worthy data that I have.
  I've searched the forums for almost a day and could not find what I need. The problems are:

  (1) I need to fit to a function of the following type: P = Po/2 - in / 2 * erf (sqrt (2) *(x-xo) w), where the Po, xo and w are my settings.

  But in my error2.vi, I can't tie my y = sqrt (2) *(x-xo) variable w of the iron works at the entrance, because the erf.vi does not table 1 d as input and which gives as output as well. The output is another problem, as F(x,a) entry must be a 1 d array.

  (2) I read on the nonlinear CurveFit VI of Lev - Mar and I think I what to do. However, an I had problems in the wiring of my static VI reference to the F(x,a) entry in the Lev - Mar VI and it does not give me a cut wire only when I reference a strictly "VI reference typed". What does that mean? Why it works only with who?

  I know these are pretty basic doubts, but I tried to figure it out for some time and could not achieve.

  Thank you.

  PS * the fitting function (Subvi) is the error2.vi file.

  Try this. Seems to work very well (LabVIEW 2013).

  (do not try chart the best settings, graphics the best out of shape!)

  

• Problem of Nonlinear Curve fit: Lev - Mar

  Hello, I am trying to use lev - mar to fit my data. I think that lev - mar is suitable for my non-linear data of the diode I - V curve. How to connect the input of the VI of lev - mar? What should I put in the data / initial settings / covariance? I've seen examples in the labview, but still can't find the solution.

  Suggest you start here: Introduction to the adjustment of the curve http://www.ni.com/white-paper/7669/en/

• Adjustment of the non-linear curve Lev - Mar ignores entry model

  I use the curves of Lev - nonlinear Mar made to fit two of the data in the same VI.  However, the second time I call the Lev. VI - Mar, it ignores the model and continues to use the first model.  When I run Lev - Mar outside my VI, it can adapt to these two sets of data correctly using two different models.  How can I get the VI to use the correct model of the second time I called in my VI?

  I'm using Labview 8.0 on windows XP.

  The VI itself is not protected by, but it is part of a library passworded, indirectly blocking the operation.

  You can still select all the code and copy it into a new VI, the hook upwards all connectors.

  You can also browse the VI Explorer and copy it. The copy of the give a new name, open it and log out of the library (File menu) to fix the broken arrow.

  I think you can also change the original in place and press "Save". It does not have a password and will overwrite the existing VI. Don't make any mistakes here!

• The non-linear curve fit lev mar problem

  Hi, I have a set of 10000 readings recorded every second. My goal to draw these vs time readings (1-10000 s) in logarithmic scale and adjust the exponential curve that results with my model equation: a1 * exp (t * b1) + a2 * exp (t * b2) + a3 * exp (t * b3) + a4 * exp (t * b4) and get the values of the coefficients (a1 to a4, b1 - b4). I changed the non-linear adjustment of lev - mar.vi according to my model. However, I ran into a problem.  I get the following: error-20041 occurred at LM.vi:5 to get on the curve of the NI_Gmath.lvlib:Nonlinear Possible reason (s): the system of equations can be solved because the input matrix is singular. I can't work on why I get this error. I enclose 3 files: the data file (values of Y), X = 1-10000; coating not get my model and vi vi.

  I'm using Labview 8

  I would appreciate your help and suggestions! Thank you very much in advance. ANU

  Hello

  @Jim-thank you very much... ur modified vi helped a lot... but a strange thing on the adjustment is that it depends a lot on the estimation of the coefficients... my model should have values of 'a' coeffs in the order of 10 ^-7 and 'b' should be higher around 10 ^-1. The initial proposal is amended the best coefficients made vary accordingly.

  I don't really know if this can b fixed... I enclose my vi.

  VI: - non - linear adjustment model, exponential branch.

  data - pol.txt

  I appreciate you all!

• Problem to adjust the data using the algorithm of lev - mar...

  Hello

  I'm a casual user of LV, and I need signal level using a non-linear custom model. The signal is basically a decay of exp (order 1) with a continuous component, so it's pretty simple.

  When I apply the routine of Lev - Mar's non-linear editing, I've always had the famous "an exception has occurred in externally called by a function of the call library node. This could have corrupted memory of LabView. Save any work., etc.. VIwas stopped to node "" a call to "NI_AALPro.lvlib: Real - Decomposition.vi of SWINE vesicular disease.

  The thing is I've already adapted successfully some basic (linear model) data using this form of Lev - Mar non-linear... but it won't work this time... and I don't see why.

  Could you watch my VI and model definition and tell me what I need to improve, and what might cause the problem? The main VI (TPV_Fit_ExpDec1_v1.0.vi) open a text file that contains my data (3 columns: time, a pulse (not useful for editing), the signal to fit). At the beginning, I isolate the part of the signal that matches t > = 0, because it is where begins the exponential decay. So I want just to get the part. I join the main VI, a txt file containing typical data, and made the VI that define the model to the lev-mark function.

  I would appreciate your help and suggestions!

  Thank you very much in advance.

  MY VERSION of LABVIEW is the 8.2

  JB

  Here's a quick rewrite. You should ALWAYS figure the curve for the initial parameter estimates see if they are in the ballpark. Rather than modify the data, you could just put the weight to zero for negatvie x. see if it works better.

  

• Non-linear function Lev - Mar - output gradient functions reference table?

  Hello

  I have the whole 8.6 developer and am relatively new to labview.  First time posting, but these tips already have a lot of my problems solved.  Thank you!  My luck ran out however...

  I had worked on a recursive function to fit a set of nonlinear data, when I stumbled upon the function of lev - mar.  What a great discovery... it works very well.  However, I tried to determine the criteria for the named 'f '(X,a)' reference to the static VI which contains the lev - Mar function to fit the output.  The function performs fine without her that it will calculate the slopes in itself if the gradient table is empty, but it takes a little more time and I'm trying to speed up a bit.

  The example 'Fit Gauss surface with offset.vi' is the only example I could find where the output of f'(X,a) of the reference to the function VI is populated, but I'm a little rusty with my calculations and has failed to reverse engineer exactly what should be the values that they had classes in this table.

  I would like to be able to complete the table of f'(X,a) with the data of a 2d versus 3d surface curve in the example 'Fit Gauss surface with offset.vi.  Is attached a screenshot of the example showing the output in the example of f. '(X,a).

  Thank you very much!

  -Bill

  If you do not provide the analytical partial derivatives, LabVIEW will use automatically digital derived partial. You can watch the labview code in detail to see how it does, just open the VI and search for "LM digital gradient.vi.

  I don't know what, "recursive function" in this context, but they have an analytic expression for the partial derivatives?

  Even if the analysis of the partial derivatives are not possible, it may be an advantage to making your own derived partial inside the model. It seems to be much faster.

  You'd basically is to calculate the function several times, each time with one of the parameters that is incremented by a small delta and subtract function calculated with the current settings Plains each and divide the result by the delta. Do everything in a table 2D for the output of f'(X,a).

  The image shows one way to do this inside the model. The black square is a model where you replace you own function (f(x,a)).

  

  Let me know if you have any questions.

• Constant time of entry for the PXI-6255

  Hello

  I connect a fairly high resistance at the entrance of a card PXI-6255, and I'm worried about constant time to entry are perhaps too big. I want to know is what is the ability to input of the card, or at the very least, what is the time constant for my setup? I currently use on 200kOhms, and he couldn't really do much lower.  Thank you.

  Hi kyh637

  NEITHER x 625 specifications
  http://digital.NI.com/manuals.nsf/WebSearch/210C73CBF91128B9862572FF0076BE85

  In the specifications is mentioned that the impedance between HAVE + and GND AI is > 100 GOhms parallel 100 PF..  Thus, the input capacitance must be 100 PF.

  The reason why you might want to know that this is to determine the time, I guess.  If so, there are graphic sedimentation on page 2 of this same document specifications.

  See you soon!

• How can I connect 2D Boolean table at the entrance to the structure of the case?

  Hello

  I would like to know how to solve this problem. I try to connect the output of a digital 2D painting and a constant number of 'BIG' before you connect it to the entrance of the structure of the case. An error message appears and it shows ' the type of the source is a 2D boolean array. The sink type is Boolean "."

  I tried to 'disable indexing' on the box of the structure of the case, but the error remains. Would appreciate any comments on it.

  Entry 0 third entry in the index table, not the other.

• How to assign to the logic of distance in a separate in Logic Pro environment physical port entrance

  Is it possible to assign the logical KEYBOARD with a separate entrance in the port of entry of environmental Logic Pro physics?

  Thank you for your advice.

  I don't think so.  Logic of distance is considered to be a controller. Controller input data stream are made (by logic) before stopping the logic entry in physics. I "think" (I'm not an expert on remote logic) that the flow of midi is available on the port of the sum.

  I'm still not aware that you can change the channel of the South on the logic of distance. So it must be channel a (connected) and your other controllers must be able to have their midi outputs assign other channels if you demux their output.

  (please, correct me if this is not correct about the logic of distance - more conjecture on my part because I use remote logical not)

• MacBook Pro, constant beachballing trolling

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  Aug 22, 2016, 21:24:16 self-test - spent

  Then. about a year and a half, I had a Samsung Evo 840 500 GB SSD because the original hard drive in my Macbook Pro early 2011 need to relax a bit. Immediately, I saw incredible results. I simply restored a time machine backup and everything worked beautifully and kept making only a few months before.

  One morning I wake up and all of a sudden, everything is extremely slow. Clicking on anything, to open anything and start my mac takes forever. Even simple typing was extremely laggy. Constant beach ball was my new reality.

  After the restoration, wiping, do an install own a couple of times, I thought that the data on the computer was not the problem.

  I thought it might be my RAM and fortunately I had upgraded my RAM earlier, so I could easily pop in my old and see if it solves the problem. There can be no.

  I have a Macbook Pro, which was 4.5 years... probably my SSD of 1.5 years could not be the problem. I didn't have my old hard drive, but was able to get my hands on one to test. Not that's the lag (I mean, since it's an old hdd, it wasn't in blistering) compared to SSDS.

  I read quite a few places that the Samsung Evo 840 has serious problems. But... I put my SSD in a Windows computer, ran the thing about test Smart Magic and it says that the disc was in good health. Update the firmware anyway. Couldn't really see no improvement in speed of read/write anyway. Put it back into my mac and now it does not lag as long and as often, but it is still quite unbearable. Using the black magic speed test (disk speed test) I always get what I'm supposed to ~ 500 read/write.

  I tried to repair my disk and partitions in the recovery mode disk utility, but it does not find defects.

  Thanks in advance for any help you can give me!

  Hi, Corneille, I read your report of EtreCheck and I see several places where the problem could come from.

  First, you must enable TRIM on your SSD.

  Uninstall bittorrent. Torrents are great places to pick up malware. They to hitchhike on downloads and even you would not be aware.

  Uninstall Google Drive, it is a known culprit.

  Then run another report of the CE.

• No sound when guitar hung on the macbook air.  entrance monitoring, on strong connections.  Speakers as microphones, strangely, but nothing straightens guitar sound.

  Hi all

  I'm operating out of a brand new MacBook Air.  I tried to interfacing with 2 separate 3.5 mm adapters, but also a USB adapter without success.  I have followed input turned on and I am getting no sound what so ever of the guitar.  Strangely, my speakers seem to act like microphones when I am connected, but nothing is to recognize that a guitar is plugged.

  Very simple configuration.  The Paul > electric guitar string > guitar string 1/4 in an adapter of > 3.5 mm 3.5 mm adapter into the headphone jack of the computer (also tried USB adapter) > choose the guitar/bass track (also tried audio) > select input 1 (or USB) > monitoring of activated entry = absolutely no sound guitar!

  Any guidance here will be very appreciated.

  Thank you!

  The headphone jack is an exit, not an entrance and the USB is a digital input, your Les Paul is not digital, so that all the senses.

  Get a USB preamp for guitar, connect through that.

  Nice axis incidentally.

• MAR to location of the file has changed?

  Hello

  We use MAR patch files automatically Firefox by https://wiki.mozilla.org/Software_Update:Manually_Installing_a_MAR_file. However, the http://releases.mozilla.org/pub/mozilla.org/firefox/releases/latest/ directory is no longer exists and has been replaced by a file README.txt document how to use web download.mozilla.org .

  Is there a new location for the files last update MAR, or better still, a way to use the web service of releases to get a MAR?

  Thank you

  You must download the files of MAR of the repertoire of the current version.
  The most recent release directory no longer exists as you have noticed.

  • http://download.CDN.Mozilla.NET/pub/Firefox/releases/42.0/update/Win32/en-us/

  You can construct a URL like this with the current version and the version that you want to update.

  • -partial - & os = win & lang = en-US & force = 1 "rel = 'nofollow' > https://download.mozilla.org/?product=firefox-< new > - biased - < old > & os = win & lang = en-US & force = 1
  • https://download.Mozilla.org/?product=Firefox-42.0-partial-41.0.2 & OS = Win & lang = en-US & force = 1

  This will give you a MAR file if this partial update is available.