LabView, Storing in array some dynamics variables (ENG - FR)

(Version française plus bas)
Hello,
I have made a tiny .vi for using DAQ USB in analog acquisition of sine.
I want to store each step of test in one array. But when I start a new measure , it erase the old one.
Sorry for my bad english
Bonjour,
Je suis actuellement entrain de mesurer des dephasages grâce au DAQ de LabView. J'aimerai sauver mes différentses phases de test dans un tableau mais à chaque nouveau test les valeurs sont écrasées.
Merci d'avance pour vos conseils
Solved!
Go to Solution.
Attachments:
Aquis_boucle_liught.vi ‏142 KB

The stop button does not work because you have a dataflow problem. The stop button gets read exactly once at the start of the program, and then never again because the inner loops never stop. Once the inner loop starts, the outermost loop does not iterate until all inner loops have completed. This also means that the stop button will not get read. If you want a button to get the updated value inside an inner loop, the terminal needs to be inside the inner loop.
If all three of your buttons are off, you have three inner loops that execute empty cases, each as fast as the computer allows, consuming all available CPU. The loops need a small wait. See also.
You really need to learn about dataflow and design patterns. You code could be simplified dramatically. It is way to chopped up and inside out.
LabVIEW Champion . Do more with less code and in less time .

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Message Edited by rolfk on 01-10-2007 10:43 PM
Rolf Kalbermatter
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seah_ly wrote:
I need a user to keyed in a list of age so to calculate the average age. The values entered is stored in into an Array (not arrayList) I have been using ArrayList rather than array. =(Yes you are correct in using an ArrayList, however if arrays are required you could mimic the actions of a growing ArrayList by using an array and initializing a new array with double the size of the old array and copying the old elements to the new array. Note this is exactly what an ArrayList does.
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Shobhit
Message was edited by:
Shobhit.Kapila

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NI Switzerland

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double F[][] = new double [nxn+1][nyn+1]; double A[][] = new double [nxn+1][nyn+1];
double B[][] = new double [nxn+1][nyn+1]; double C[][] = new double [nxn+1][nyn+1];
double D[][] = new double [nxn+1][nyn+1]; double E[][] = new double [nxn+1][nyn+1];
double s[][] = new double[nxn+1][nyn+1];
          KDerivatives1 obK1 = new KDerivatives1();
          KDerivatives2 obK2 = new KDerivatives2();
UDerivatives obU = new UDerivatives();
          CalcPdeCoefficients obPde = new CalcPdeCoefficients();
          CalcFdCoefficients obFd = new CalcFdCoefficients();
          Gs obGs = new Gs();
dx = obDetails.seg(vBxn, vAxn, nxn);
dy = obDetails.seg(vByn, vAyn, nyn);
dx2 = dx*dx;
dy2 = dy*dy;
if (bc1 != -999999999) obDetails.initialiceBCDomainL(dx, dy, vAxn, vAyn, bc1, u);
if (bc2 != -999999999) obDetails.initialiceBCDomainU(dx, dy, vAxn, vAyn, bc2, u);
if (bc3 != -999999999) obDetails.initialiceBCDomainR(dx, dy, vAxn, vAyn, bc3, u);
if (bc4 != -999999999) obDetails.initialiceBCDomainD(dx, dy, vAxn, vAyn, bc4, u);
obDetails.source(dx, dy, vAxn, vAyn, s);
do {
++ newton_iter;
if (kcn == 1) {
          obK1.calc_k(u, k);
     obK1.calc_kp(u, kp);
     obK1.calc_kpp(u, kpp);
          } else {
               obK2.calc_k(u, k);
          obK2.calc_kp(u, kp);
          obK2.calc_kpp(u, kpp);
               obU.calc_dudx(u, dx, dudx);
          obU.calc_dudy(u, dy, dudy);
               obU.calc_d2udx2(u, dx2, d2udx2);
               obU.calc_d2udy2(u, dy2, d2udy2);
          obU.calc_dudt(u, u_n, dt, dudt);
          obPde.calcPdeCoefficientsa(k, a);
          obPde.calcPdeCoefficientsb(kp, dudx, b);
          obPde.calcPdeCoefficientsc(kp, dudy, c);
          obPde.calcPdeCoefficientsd(kp, kpp, dudx, dudy, d2udx2, d2udy2, d);
          obPde.calcPdeCoefficientsF(k, kp, dudx, dudy, d2udx2, d2udy2, dudt, s, F);
          obFd.calcFdCoefficientsA(a, b, dx, dx2, A);
          obFd.calcFdCoefficientsB(a, b, dx, dx2, B);
          obFd.calcFdCoefficientsC(a, c, dy, dy2, C);
          obFd.calcFdCoefficientsD(a, c, dy, dy2, D);
          obFd.calcFdCoefficientsE(a, d, dx2, dy2, dt, E);
          obGs.gsMethod(v_n, A, B, C, D, E, F, dt, error2n, v);
          m = m + obGs.iter;
          for (int i=1; i < u.length - 1;i++ ) {
               for (int j=1; j < u[0].length - 1 ;j++ ) {
     u[i][j] = u[i][j] + v[i][j];
err = 0;
          for (int i=0; i < u.length ;i++ ) {
               for (int j=0; j < u[0].length ;j++ ) {
               err = err + Math.pow(v[i][j],2);
          err = Math.sqrt(err);
while (err > error1n);
     return u;
public double[][] rectangleDomainF (Vector vAxvector, Vector vAyvector, Vector vBxvector, Vector vByvector, Vector nxvector, Vector nyvector, Vector error1vector, Vector error2vector, double end_t, int steps, Vector kcvector, double numberdomains, Vector bc1vector, Vector bc2vector, Vector bc3vector, Vector bc4vector) {
               double u[][] = new double[u.length][u[0].length];
               double dt = obDetails.seg(end_t, start_t, steps);
               Vector uvector = new Vector();
               Vector vvector = new Vector();
     do
++work_count;
          t = work_count * dt;
for (int k = 0; k < numberdomains ; k++) {
     solveDomainMethod((Double)vAxvector.elementAt(k), (Double)vAyvector.elementAt(k), (Double)vBxvector.elementAt(k), (Double)vByvector.elementAt(k), (Integer)nxvector.elementAt(k), (Integer)nyvector.elementAt(k), dt, (Double)error1vector.elementAt(k), (Double)error2vector.elementAt(k), end_t, steps, (Integer)kcvector.elementAt(k), (Double [][]) uvector.elementAt(k), (Double [][]) vvector.elementAt(k), (Double)bc1vector.elementAt(k), (Double)bc2vector.elementAt(k), (Double)bc3vector.elementAt(k), (Double)bc4vector.elementAt(k), u);
                                                       uvector.insertElementAt(u, k);
          vvector.insertElementAt(v, k);
while (t < end_t);
return u;

The only way to, for instance, multiply a Double object by another Double object is to convert them back to primitives, multiply them, and create a new Double instance:
public Double multiply(Double lhs, Double rhs) {
   return new Double( lhs.doubleValue() * rhs.doubleValue() );
}This is just an overhead that you have to accept if you want to use collections with primitive type data.
Coming soon in 1.5 (which is in Beta now and available for download in the usual places) a new feature called auto-boxing will do a lot of this automatically for you. You need to be aware that it's doing exactly the same operations with the same performance overhead; but it does save a lot of typing.
Thus in 1.5 the above becomes:
public Double multiply(Double lhs, Double rhs) {
   // Under the hood this is IDENTICAL to the above example
   return lhs * rhs;
}Now, addressing your post directly:
Besides I cant turn a data from "Double" to "double"
Yes you can, as in the first example, the doubleValue() method converts a Double object to a double primitive.
Java is not very useful to do this numerical problem.
If you need math performance, you need to use primitives, yes. Yes, that will preclude the use of collections.
Dave.

Storing current slide in a variable, then using the variable to get back to that slide (Captivate 6)

I'm thinking there must be some info on this somewhere, because it's something people must want to do, but I haven't been able to find an answer.
I would like to set something up so that when a user clicks on a button, it will take them to a certain slide. But I want the current slide stored in a variable. And then, when they are ready to go back, there will be a return button, but it should check to see where they came from and then return them to that specific slide. Basically, a "return to last slide visited" type of advanced action. I can't use the "return to last slide" option because the slide they are taken to when they first click the button has multiple slides, so the "return to last slide" option would not take them to the last slide they were on before visiting this page. I tried to store this in a variable on a button click by assigning a variable with CpInfoCurrentSlide, and then jumping to a slide. But, I'm not sure how I would then use that info to return to this slide.

Captivate Advanced Actions don't actually provide an easy way to do this. It's another area we really need to address in forthcoming versions.
You need to use an On Enter Slide event to store the value of the cpInfoCurrentSlide system variable in a user variable.
Then you need to create another advanced action that can be triggered by your later button. Somewhat counterintuitively, you need to use an Expression action (rather than an Assign action) to assign the value captured in your user variable to cpCmndGotoSlide. But that's not all. Due to the way Captivate's slide indexes work, you'll need to deduct one from the value of your user variable before assigning it to cpCmndGotoSlide.
Then, unless you want the slide timeline to pause, you need to add a Continue action.
The final action looks a bit like this:

LabView, Storing in array some dynamics variables (ENG - FR)

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