Fitting output of XY Graph

Hello, I'm trying to fit the output of an XY
graph which is (1-D Array of Cluster of 2 Elements(2x 1-D Array of
Double[64-bit Real])). It seems like instead of having one array with
two columns X,Y indexed persample number, I want to have a 1-D Array of
Column Y , indexed by X. Any ideas?
Thanks.
I'm getting NaN on the slope and intercept
of the Linear Fit VI outputs, is there a way to take the output of the XY Graph Local
Variable feed it into the Curve Fitting VI and then add the fitted
curve back into the XY graph? It seems like it does not like the Output
of the Graph.
Thanks.
Attachments:
fit.PNG ‏13 KB

Hi Lefterisa
Can you post an example VI with your data in it so we can further look into this. Be sure to have as many elements in the X as you have in the Y for them to properly form coordinates. The basics behind this function is that it needs a set of x and y data to which it will return the best linear fit using the method specified in the input.
Thank You
Eric Reid
National Instruments
Motion R&D

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Trying to fit output of XY Graph

Hello, I'm trying to fit the output of an XY graph which is (1-D Array of Cluster of 2 Elements(2x 1-D Array of Double[64-bit Real])). It seems like instead of having one array with two columns X,Y indexed persample number, I want to have a 1-D Array of Column Y , indexed by X. Any ideas?
Thanks.
Solved!
Go to Solution.

lefterisa wrote:
I'm getting NaN on the slope and intercept outputs, is there a way to take the output of the XY Graph Local Variable feed it into the Curve Fitting VI and then add the fitted curve back into the XY graph?
Please attach your VI and some typical data. Most likely one of your points is NaN, in which case the linear fit will fail of course.
You really have some misconceptions. An XY graph is a data sink, and not a data source and faking it with local variables just complicates things.
So what you should do it take the output from the xy express VI, remove the points containing NaN, do the linear fit, and send both to the same xy graph terminal. You only need to write to the graph once.
Message Edited by altenbach on 11-06-2008 03:37 PM
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Solved!
Go to Solution.

Hi Omar,
i changed the shipped Labview Example to use the General Polynomial Fit VI with a waveform graph.
But why don't you want to use a X-Y-Graph?
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Attachments:
test.vi ‏37 KB

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Message Edited by altenbach on 08-12-2005 02:50 PM
Message Edited by altenbach on 08-12-2005 02:51 PM
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I've been inputting values that spans multiple columns and rows to create a graph.
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Hello all-
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Attachments:
HX Block Diagram 2.jpg ‏302 KB

The output you have circled is a cluster of two 1D arrays, not a string.
XY graphs take a varirty of inputs (array of points, cluster of x and y arrays, complex arrays, etc.) but you cannot mix datatypes in a single graph. Since you are graphing arrays of points (a point is a cluster of an x and y scalar), you need to do the same for the data you circled. Simplest would probably be to just wrap an autoindexing for loop around the bundle function. See how far you get.
If you want detailed help, please attach your actual VI. We cannot debug a picture.
LabVIEW Champion . Do more with less code and in less time .

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FITTING IN XY GRAPH

Hello
I am new to LabVIEW and have problems fitting curves in xy graph.
I can fit in waveform graph, but not in XY graph.
Here is my program.
Thank you for your answers.
Solved!
Go to Solution.
Attachments:
MOJI PODATKI POFITANI XY graph.vi ‏51 KB

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Graphs and parent-child with loops and duplicates

There is a parent-child relation in the table t(prnt, chld) which allows duplicates (A->B, A->B) and opposite paths (A->B, B->A), and complicated loops. Is there a way to identify rows that form any separate "connections network" and assign a "name" to them of any kind (letter, number, wahtever)? I try to use WITH recursive clause to identify and group rows belonging to one graph but with no luck. Any help would be appreciated.
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Frank, I posted inputs for all graphs (multiple inserts) and some allowable outputs for one graph. For all cases (ie. graphs) the rule is the same:
1. identify all nodes belonging to a graph
2. "name" that graph (min, max or whatever you like)
3. print the output in the form (node_belonging_to_a_graph, name_of_the_graph) for all identified graphs
And as you said, I am somewhat flexible. I don't want to constrain the problem with saying min, max because it's not important how you name it, but the way which is somehow natural and fits with requirements is the usage of nodes' values.
You ask me if (1,1),(2,1),(3,1) is also OK as an output for sample graph (1,2)+(2,3). Yes it is. It is one of those I posted but with additional node which is chosen as a name for a graph. But as you can guess it doesn't matter which node you choose, and the additional information about a node named with its own name is not as important and the information that all other nodes are named with that name but it is 100% acceptable. If you changed the naming convention and started to use letters instead of node values then yes, it would be a must to have the output in the form (1,a),(2,a),(3,a).
You also ask me about the result for 90x data inserted as 5 rows: (901,902)..(906,904) and present sample result:
901 902
905 902
906 902
And the answer is no, it is not good result. It misses the information about the nodes 904 and 903 which belong to this graph too. The correct result could be:
901 902
905 902
906 902
903 902
904 902
or any other "combination" which presents 5 nodes with the name of the sixth (in this case of 6-node graph). Just one have to be picked, it doesn't matter which one. The "vertical" order is also irrelevant.
As you can see there is a lot of room that gives acceptable result. I don't want to constraint it because it can influence performance which is important when dealing with graph structures in relational databases (RDBMS are not predestined to easily cope with that sort of information). It can also influence the chosen algorithm and I'd like to pick the fastest one which gives acceptable result.
Two numbers x and y are in the same group (graph) if (and only if) at least one of the following is true:
(1) they appear on the same row together (it doesn't matter which number is in which of the 2 columns), or
--(2) x appears on the same row with a third number, z, and z is in the same group as y--
(2) there are other edges (entries) in the table that form a "path" from x to y. And because the direction of the path is not important for the problem (ie. the parent-child table structure can be forgotten for a moment), the path means "there exists connection" between x and y aka "you can walk from x to y".
The output consists of 2 columns: id (which is unique in the result set) and grp (which identifies the group) *[correct]*
The id column will always be one of the numbers in the group *[correct]*
It doesn't matter what the grp column is, or even what data type, as long as it distinguishes between the different groups. *[correct, but as you noted using one, picked number from a graph is the prefferable way]*
If there are N distinct numbers in the group, I need N rows of output for that group, with id showing all those distinct numbers. *[correct, but if you choose your naming convention as naming a graph with the value of the node belonging to it you can ommit the node which is named for itself (but it doesn't hurt is such row appear in the result)]*
You ask me if the graph is directed. No it's not. Your example (x,y) and (y,x) is great, and it can be concluded from my first post when I say that "opposite paths" (A->B, B->A) exists. What matters is the connection between the nodes. The parent-child table somehow imposes that direction is important, but for this problem it is not.
One of the motivations for my post is to know what other people think without affecting their minds with my approach. I don't want to skew anybody's mind into my solution which works, but it's not effective. I don't mind showing it but I kindly ask you to think about the problem before I post it. Diversity of approaches helps to distill the best one.
As I said I did it with the usage of sys_connect_by_path. If it doesn't appear to you as possible usage then it is likely that I don't use it efficiently. Please understand, I will post it if you ask me one more time but if you can live for a while without my inefficient solution and suggest something with WITH clause I would appreciate it.
There is no exact result I expect. There are many results which are correct and acceptable. They all must follow the rules described at the beginning.
Thank you
Edited by: 943276 on Jun 28, 2012 1:32 AM

Problem: Fitting Lev-Mar with Error Function

Hi everyone,
I have very little experience with LabVIEW and I'm trying for the first time to do some NonLinear Curve fit for some data I have.
I've searched in forums for almost a day and couldn't find what I need. The problems are:
1) I need to fit a function of the following type: P = Po/2 - Po/2*erf(sqrt(2)*(x-xo)/w) , where Po, xo and w are my parameters.
But in my error2.vi I cannot link my y=sqrt(2)*(x-xo)/w variable of the erf function to the input, because the erf.vi does not accept 1D array as input and doesn't give that as output as well. The output thing is another problem, since the input of F(x,a) needs to be a 1D array.
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I know these are some pretty basic doubts, but I've been trying to understand it for quite some time and couldn't get this done.
Thanks.
PS* The fitting function (subvi) is the error2.vi file.
Solved!
Go to Solution.
Attachments:
error2.vi ‏13 KB
FittingGaussianKnife.vi ‏15 KB

Try this. Seem to work just fine (LabVIEW 2013).
(don't try to graph the best parameters, graph the best fit output!)
LabVIEW Champion . Do more with less code and in less time .
Attachments:
FittingGaussianKnife_MODCA.vi ‏17 KB
error2_MODCA.vi ‏14 KB
erfit.png ‏40 KB

Fitting output of XY Graph

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