with a formula node

Similar Questions

• Problem with formula node

  Hello

  I'm using LabVIEW 2012 and there seems to be a problem with the node of the formula. The output of a simple no operation is not correct.

  I have an input U8, whose value is 255. I apply a no operation (a = ~ a and the value returned by the formula node is also 255.)

  Is this a bug in the node or there at - it another way to calculate the bit DO NOT level?

  Thank you

  Ritesh

  You must use the function or exclusive.  So what you really need, is:

  a = a ^ 0xFF

  EDIT: Dig even more, it is called a 'top-up bit.  I consider cela a bug.  I see the same thing with 2011.

• Formula with coefficient table node

  Hello everyone!

  First of all, I want to thank you all from this forum because it helps me a lot with the question, thank you!

  And now my doubt...

  I have a table of measured values, and I need to use it in a formula to convert measures voltage, temperature.

  In this equation, I have coefficients I wanted to extract a table or a matrix.

  Try to solve this. I converted the table into a cluster and send formula node inside a loop for.

  Before I inserted the cluster and wrote the coefficients manually, the program worked, but now it doesn't

  I made the program run with the "lamp" and noted that, in my loop for example, the 'I' does not increase... Any suggestions?

  Thanks for the help.

  Leandro

  Ok. I'm kind again in LV

  I did not know the index and it influences in the loop for, thank you, it helped me a lot. I don t know how to use the commands that you said, but I found an alternative. Maybe (and I'm sure) that it's not the best, but it works. If you gak, or anyone who reads this has another idea, post it here. I am interested to know.

  After that I'll take a look in these commands, you said to learn more on this subject.

  Thank you very much

  Leandro V. Zaccarias

  MEF-UNICAMP

• calculation using the formula node needs two clicks

  Hello

  I want to use this piece of code for a larger program. My goal is to take 10 values and calculate two values using a formula. I used the formula node as the calculation functions digital ordinary would be too heavy. If I click on save, it saves two values to a file.

  The problem that I am facing is that when I start the program, it works very well for the first time. The second time however, if I change the values, and then click on save, it still displays the previous values, or some altered values. I have to click on save twice to get the correct values. I don't understand the reason why this happens. Can anyone help?

  File attachment: Capture screen and VI.

  P.S. If the solution can help with the problem, I'm ready to change any part, but please, not irrelevant to suggestions on how to * improve my code *, because I've worked hard to make it work with another major project.

  I don't completely understand the description of your problem.  But I see two problems.

  1. the "Save" button actually belongs to the event that handles the record button.  And the case of the event should really be Jean-Claude Value Change of mouse down?

  2. your STOP at the bad mechanical action.  Since it happened so this just released, it is only true while you're pressing it.  It stops the upper loop, but can't stop low loop because your loop will also be waiting to save button to press.  Stop will always be false because you cannot press two buttons at the same time.

  Try to make your action to stop button to be changed when released.  You must return the button to false programmatically born of two loops.  In fact, it would be better to have a case of events for the stop button to stop the lower loop.

  I don't understand what you're trying to do in the upper loop.  You read a file as soon as possible, and it seems to be the same file that you create in the lower loop.  Why?

• Pass the array to the formula node Eval (any chance to avoid this?)

  Hello

  I have not installed on my PC of MATLAB.

  I need to be able to say from the entry Panel custom formula "y = sin(Fm*2*pi*t[i]) + 2 * sin(3*Fm*2*pi*t[i]) + 3 * sin(4*Fm*2*pi*t[i])..."

  This form may contain a variable of harmonics (sine or cosine functions), but strict number of input parameters: Fm, t [i].

  FM - is a frequency.

  [i] t - is a time (ramp model) which is a table

  Can I pass array as a parameter of t [i] entry in formula node? How to do what other parameters, which are constants?

  Is there another method how to implement this - using the variable functions count?

  You are still far too complicated and it's still not scalable for a variable number of terms. You must be able to get out of math based text and think in terms of real LabVIEW.

  Here's a quick example using the terms in your first post (I show only a picture, because I have more LabVIEW 7.1).

  Modify if needed.

  

  NOTE:

  If you have more than a couple of terms generally, I tenacious feel that it would be simpler to configure a table complex stick (with the desired amplitude and frequency positions) and do an inverse FFT on this.

• PV cell equation error in formula node

  Hello! I build now a simulation of the PV in LabVIEW System with maximum power point tracking and I'm doing this work of VI by using the formula node but I can't run it because of a "problem of indexing table. The VI is based on the toolkit of the LabVIEW for the characterization of IV by using the equation of the current PV cell. I added the XY graph to graph the current and the voltage of the equation. I'm really new to LabVIEW, so any suggestions would be greatly appreciated. I have attached the VI I build.

  Hi spectrum.

  the formula can't calc with berries how LabVIEW is:

  

  (Check for a correct calculation against formula...)

• Formula node problem

  Community salvation OR

  I am currently working on a VI where I run primarily calculations. I use the structure of noda formula I have some experience with. I insert some quiet easy formulas, but when I run the VI there are something that I don't understand. Here is the crux of the formula:

  

  Here's the problem:

  consider the first iteration and don't spend attention to H1, H3, and H4.

  In the first iteration, my input values are V201 = 0 and pw = 4. Then H2 must be calculated = 0 (this also happens when I run the VI in the execution of climax).

  If H2 = 0 also Q1 should be = 0 (this also happens when I run the VI in the execution of hightlight).

  In the next step produces the problem when I want to calculate VRw2. It should be VRw1 (which is 0, the first iteration) then add with 0.25 times Q1. Because Q1 = 0 this should give VRw2 = 0. Instead, it calculates somehow VRw2 = 25. For some reason any he sees Q1 100 instead of 0. In the next iterations, it always adds + 25 to VRw2.

  Anyone has an explanation of how this can happen and how do I fix?

  I'll add the VI (LV13) as an attachment so you can try some things if you want.

  When in doubt, read the help... Formula node.  There is a special note in there.

  Note  Formula node accepts only the period (.) as the decimal separator. The node does not recognize decimal separators located.

• Formula node cannot use 'fabs '? Can someone help me?

  I want to use 'fabs' of the formula node, but it appears the "undefined variable" information, showed in the following image. Anyone know how to solve? Thank you very much!

  Xiaoquan wrote:

  Yes, I tried.  It may be accurate to six decimal places.  I might tink this is the limit of the DBL. You know another way to increase accuracy? Thank you very much!

  This is not true! Make sure that you change the display format of the indicator to show enough digits.

  (right-click... display...)

  

  (If you still have problems, please include your code with some typical data).

• Sorting table 2D using the formula node

  Hello

  • What l am trying to do is kind of numbers in groups.
  • A group consists of the numbers that are equal, or step upwards or downwards by a single value. Each group must be assigned to a column. E.g. O column of the table of entry test would consist of 5, 4 and 3, but not the 9 and 10. These values belong to column 1. However if the adjacent cell in the column was not empty then 9 and 10 would stay in column 0
  1. To better understand the programming formula node went to 1 d. I found that each cell is not treated individually with my code.
  • The final table of the orange entry test is that the data type l want to sort a 2D picture that ends up the same size chart.
  • In the code l provided my goal to compare each cell of each column line to determine if a cell is equal for example a = b, a + 1 = b or a-1 = b If Yes, then these values are in the right column. If this is not the case, a sort must be made to put a value in the right column it is.

  This is my first shot with node formula and l must admit others examples l found a bit confusing how a result has been obtained. I prefer to do any programming in labview instead of going to another program for results l am after. I tried to picture of programming just for this problem and found to grow big and very complicated then stopped l. For me the road to node formula should be simpler and more compact. My last resort is to use Excel but l still hope to do all the programming in Labview l you end up with a more dynamic program.

  Concerning

  Michael

  Hello

  You are brilliant... bloody!

  I just couldn't she would repeatedly using tables, l have been on it for weeks. I never thought about how you solved this problem.

  I hate excel and text. I am graphically spirit therefore l such as labview.

  I had a solution in Excel yesterday, but your solution is much better than what l came with

  I'm very grateful

  Thank you

  Michael

• Fill the table with the formula nodewith a line of code

  Hello

  This is my first post of the community, OR maybe this question has been asked 1000 times but I could find no answer.

  Before using LabView I used Matlab a lot. I find a bit that it's too complicated without reason sometimes in labview work with arrays.

  I inherited, and I'm doing a little cleaning. what it does is extractr 2 and 3 position and creates a new table with her and another oner with other elements of the first table. In my view, that he becomes confused because you should rely on the cell of the table, the position of the output and I didn't wat to work this way.

  

  I replaced it with a knot of formula. Here is the code

  The departure is FP, the table of 6 elements is mdot and the 2 elements array is press

  MDOT float64 [6], press [2];

  MDOT [0] = FP [0]; MDOT [1] = FP [1];
  MDOT [2] = FP [4]; MDOT [3] = PS [5];
  MDOT [4] = PS [6]; MDOT [5] = FP [7];

  Press [0] = PS [2], press [1] = PS [3];

  Now, I want to know if it is possible to do as I would in matlab or C, where you can create a table with one line of code. What would the syntax in formula node to do something like:

  MDOT [6] = [FP [0], FP [1], [4] of FP, FP [5], FP [6], FP [7]];

  Press [2] = [FP [2], FP [3]];

  Thank you

  Use remove the table.  You can provide an index and length of elements to remove.  One of the outputs will be the original with the subset of the deleted table and the other output is the subset deleted.  1 NŒUD!

  EDIT: Created a snippet just after my previous post.

  

• formula node error

  Hi - I wrote a little VI as below and he does not like the formulas. For the life of me, I can't see what is wrong and I did similar things before.

  I'm sure it's something really simple.

  Any help much appreciated.

  See you soon

  Jack

  

  You create a table 2D with the first small loop because of bad and too complicated to coding. This means that you get a table 1 d inside the second loop to "t".

  Why generate you a unique number and then use a code Rube Goldberg to initialize an array empty then insert this number in this document, leaving you with a table 1 d with a single element, which then turns into a 2D array to the limit of the for loop. All you have to do is the result of the multiplication on the edge of the wire loop.

  In fact, you don't need this first loop, you can do both in the second loop. It is sufficient to [i] multiply by the factor and wire entry "t" of the node form.

  I don't understand why you want to even use a formula node. Most likely, all you need are a few atomic operations. You can reach the real VI?

• Formula node, Dungeon errors

  I'm trying to integrate a node form in a table, I get errors and don't know why. Any ideas?

  

  Thank you!

  It is an attempt to better.

  The problem is that you only set your output array y to be a 1 d array.  And your calculations on the input array is also as if it were a table 1 d.

  See the amendment attached.

  But your formula is simple enough that in true LabVIEW code is easier and you don't have to deal with problems of syntax of the formula node.

  (Note, because I don't have data, I couldn't run this, it is so possible errors there.)

• Initialization of an array to match another size of array using the formula node.

  I want to get a few different pictures of the same length and constants in the formula node and output a table corresponding to their length after some minor calculations. Another post, I discovered that I can simply initialize the table as such:

  float pp [100];

  The problem is that I find myself with a much bigger picture than what I need. I want to do is something like:

  float [n] pp.;

  where n represents the entry of an array size in the form node or is something like:

  n = sizeOfDim(td0,0);    Here I use a table 1 d

  None of these methods seem to work. How do I initialize my picture 'pp' such that it matches the length of array 1 d of "td0?

  The more likely your initialization externally.  Create an entry named pp and wire td0 inside as well.  Now create an output with the pp even name and it will contain an array of the desired length.  Of course, this assumes that you want to edit all items in pp.  Otherwise, just use initialize the array to create a new table and feed in the length of td0, and whatever default value you want (ie. 0 or NaN).  The blank values will keep this value after the node of the formula.

• Help with If formula writing

  Hypothetical, if cell A2 is less than cell B2 and then cell A36 = 5, if cell A2 is more than cell B2 and then cell A36 =-5. If cell A3 is cell B3 below then cell A36 = 5, if cell A3 is cell B3 and cell A36 =-5. And then for the A36 cell permanently keep a total.  Can anyone help with a formula for something like that?

  You can do something like this:

  

  C2 = 5 × IF (A2, B2, 1, IF (A2 > B2, −1, 0))

  It's abbreviation dethrone select cell C2, then type (or copy and paste it here) the formula:

  = 5 * IF (A2, B2, 1, IF (A2 > B2, −1, 0))

  Select the cell S2, copy

  Select cells C2 through C35, dough

  C36 = SUM (C2:C35)

  < B > - 5

  A > B->-5

  A=B                 -> 0

• For the question of loop/formula node/Maj register_Beginner

  Hello

  I am a beginner of Labview and have a newbie question. I think that's most of you very easy, so please try to help me soon

  I (X, Y) datavalues... I calculated the average arithmetic using a formula node and a loop for and got (X', Y') out. Now, I want to take the output X' and Y' and calculate an average value in reference to X and Y. Thus, the same calculation in the loop for, but I want to take the output values and feed values again under the entry name. This should be played N times and routes.

  I tried using shift registers, but failed to connect properly as I can get what I want. I have attached here this part of my vi where I have the problem. I hope you can help me. Thanks in advance.

  Hi Sarah,.

  If you need to put the X "-paintings in a registry change, while the original X table remains constant: