Least square circle calculation on a series of data points

I am taking a series of (x,y) part measurements that describe a circle (radius & rotation angle). The center of the part and center of rotation are offset. Looking for code to do a least square circle calculation on this data set so diameter and out-of-roundness can be estimated. Platform LabView 8.2.

Here is my simple solution from the above mentione thread:
(Is it not exaclty "least squares" in the classical sense but the sphere fit works typically very well..)
LabVIEW Champion . Do more with less code and in less time .

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Least squares from file

hi i have a final project i have to write least squares best fit vi,vi should read the datas from a txt file and draw best fit line according to least squares method calculations and also it should show the datas in point form pls help to me i tried a lot but i got nothing...thx

Hey siktigit ys,
There are built in Least Square Fit functions in LabVIEW. Here is some information about them. If you are having trouble reading the data from the file, here is an example showing how to use the read and write VIs. In order to show your data in a graph, I'd just read the data from the text files into an array and display that array on an XY graph. That should be enough to get you started. If you need more help, just let me know and have a great weekend!
John B.
Embedded Networks R&D
National Instruments
Certified LabVIEW Developer

Least squares method from file

hi i have a final project i have to write least squares best fit vi,vi should read the datas from a txt file and draw best fit line according to least squares method calculations and also it should show the datas in point form pls help to me i tried a lot but i got nothing...thx

Hi,
I recommend that you search the following websites for assistance:
www.ni.com
www.ni.com/community
Kareem W.
National Instruments
Web Product Manager

Linear Least-Squares Fit

Im farely new to programming and I got stuck with a linear least-squares fit problem. I am supposed to develop a method that will calculate slope and intercept of the least-squares line that best fits an input data set.
Ive been trying to figure out just how to write this program for a couple of days, but with no luck.
Can anyone give me some tips on how to write this program and what the finished program should look like?
Any help would be greatly appreciated

Atleast I believe that I am needed to return a graph. The assignment says
"Test your method usin a test driver program that calculates the least-squares fit to the following 20-point input data set, and plots both the original input data and the resulting least-squares fit line"
And then itgives me a chart of the x and y values

SSRS 2008 Column Chart with Calculated Series (moving average) "formula error - there are not enough data points for the period" error

I have a simple column chart grouping on 1 value on the category axis. For simplicity's sake, we are plotting $ amounts grouping by Month on the category axis. I right click on the data series and choose "Add calculated series...". I choose moving average. I want to move the average over at least 2 periods.
When I run the report, I get the error "Formula error - there are not enough data points for the period". The way the report is, I never have a guaranteed number of categories (there could be one or there could be 5). When there is 2 or more, the chart renders fine, however, when there is only 1 value, instead of suppressing the moving average line, I get that error and the chart shows nothing.
I don't think this is entirely acceptable for our end users. At a minimum, I would think the moving average line would be suppressed instead of hiding the entire chart. Does anyone know of any workarounds or do I have to enter another ms. connect bug/design consideration.
Thank you,
Dan

I was having the same error while trying to plot a moving average across 7 days. The work around I found was rather simple.
If you right click your report in the solution explorer and select "View Code" it will give you the underlying XML of the report. Find the entry for the value of your calculated series and enter a formula to dynamically create your periods.
<ChartFormulaParameter Name="Period">
<Value>=IIf(Count(Fields!Calls.Value) >= 7 ,7, (Count(Fields!Calls.Value)))</Value>
</ChartFormulaParameter>
What I'm doing here is getting the row count of records returned in the chart. If the returned rows are greater than or equal to 7 (The amount of days I want the average) it will set the points to 7. If not, it will set the number to the amount of returned rows. So far this has worked great. I'm probably going to add more code to handle no records returned although in my case that shouldn't happen but, you never know.
A side note:
If you open the calculated series properties in the designer, you will notice the number of periods is set to "0". If you change this it will overwrite your custom formula in the XML.

Help with square root calculator

Hi: I am new to Java. Trying to write code for square root calculator of numbers 1-10. Have no idea where to start.

Using pencil and paper, manually extract the square root of a number, and write down the steps that you use to do that. Create a Java program that does those steps.
A Java Tutorial is here: http://java.sun.com/docs/books/tutorial/

ForLoop Square Root Calculator Program

* Programmer:      R McBride
* Date:           November 29, 2006
* Filename:     SquareRootForLoop.java
* Purpose:          This program uses for()loops to
*                    find the square root of a number
*                    up to four decimal places long.
import APCS.Keyboard;
class SquareRootForLoopTest1
     public static void main (String[]args)
          //define variables
          double SquareRoot = 0; //holds initial value
          double num1 = 0;
          boolean done = false;
          double tempReg1 = 0; //holds initial value of i
          double tempReg2 = 0; //holds
          double tempReg3 = 0;
          //while loop start
//          while (!done)
          //program input
          System.out.println("\t\t\tSQUARE ROOT CALCULATOR PROGRAM");
          System.out.println(""); //skip line
          System.out.println("Enter the number you would like to be square rooted or [0] to end the program.");
          System.out.print("");
          SquareRoot = Keyboard.readInt();
          System.out.println(""); //skip line
          System.out.println("You entered "+SquareRoot+".");
          System.out.println(""); //skip line
          //for loop function
          for(int i = 0; i < 999999; i++)
          tempReg1 = i * i;
          tempReg2 = i;
//          while (!done)
                    if(tempReg1 == SquareRoot)
                         System.out.println("The square root is "+tempReg2);
                         System.out.println("");
                    else
                         System.out.print("");
          //while loop check to finish
//          if(SquareRoot == 0)
//               done = true;
//          }//end while loop
}Here is my code for and of you who ever wants to use it. Our assignment was to make a square root calculator using ForLoop (a.k.a. no square root functions).
My question is, how would I make it increase by .0001 instead of 1 every loop? I need it to do that so I can find square roots of numbers of numbers that have decimals for squares.

* Programmer:      R McBride
* Date:           November 29, 2006
* Filename:     SquareRootForLoop.java
* Purpose:          This program uses for()loops to
*                    find the square root of a number
*                    up to four decimal places long.
import APCS.Keyboard;
class SquareRootForLoopTest1
     public static void main (String[]args)
          //define variables
          double SquareRoot = 0; //holds initial value
          double num1 = 0;
          boolean done = false;
          double tempReg1 = 0; //holds initial value of i
          double tempReg2 = 0; //holds
          double tempReg3 = 0;
          //while loop start
//          while (!done)
          //program input
          System.out.println("\t\t\tSQUARE ROOT CALCULATOR PROGRAM");
          System.out.println(""); //skip line
          System.out.println("Enter the number you would like to be square rooted or [0] to end the program.");
          System.out.print("");
          SquareRoot = Keyboard.readInt();
          System.out.println(""); //skip line
          System.out.println("You entered "+SquareRoot+".");
          System.out.println(""); //skip line
          //for loop function
          for(double i = 0; i < 999999; i+=.0001)
          tempReg1 = i * i;
          tempReg2 = i;
//          while (!done)
                    if(tempReg1 == SquareRoot)
                         System.out.println("The square root is "+tempReg2);
                         System.out.println("");
                    else
                         System.out.print("");
          //while loop check to finish
//          if(SquareRoot == 0)
//               done = true;
//          }//end while loop
}Still doesn't work. =[

I need to plot the Least Squares Regression Line (not just calculate it with the LINEST function). How?

I need to plot the Least Squares Regression Line (not just calculate its values with the LINEST function). Can anyone advise me on how to graph this line?

Grapher.app in OS X Utilities is excellent for that : entering data from Numbers Excel etc. into a Grapher "Point Set", plotting all your data, computing and plotting a regression curve linear or exponential or polynomial.
Unfortunately there is not a single word about point sets and regression in the Grapher Help.
So, suggest you download (free) "Instruction for Use - Grapher on web site
http://y.barois.free.fr/grapher/Documentation.html
and go to page 31 to 37, "Initiation > Lesson 6 : Treating a point set (Regression curve), and also page 68, "Appendix 1. Points sets : from speadsheets to Grapher".
If you try Grapher's regression curves, please tell us about the manual above : useful or not, too easy or difficult, readable or not etc.
Thank you.
YB24
PS. Documentation about Grapher is also here : Google "Apple Grapher" > http://en.wikipedia.org/wiki/Grapher > Article > Talk > Grapher 1.1 to 2.3 (French and English) (11th september 2012)

Multi variate damping least square solver

Hello all,
I am hoping to get some advice and a starting point for a challenging problem I am working on.
I have a 33x37 matrix that i need to minimize using a damping least square approach. in order to achieve the minimization I need to use a set of 50 Matrices (33x37, representing adjustment impacts) that are grouped in 12 separate catagories with different starting points and degrees of freedom, and none of the adjustment matrices are truly independent of each other (they all interact with each other to some extent.)
For the output I need the minimized matrix and the amount of each vector applied to achieve the minimized solution.
To hopefully clarify the inputs and outputs I have included an example vi with a dummy set of data.
I am hoping that someone can give me an idea of where to start, can this be accomplished using the labview libraries or will this have to use scripting via a mathscript node, or matlab? If it can be done in different ways which method is the most efficient?
I hope this is enough information, but if you need more details please let me know, although giving exact details can be difficult in this case due to IP considerations.
As always thank you in advance for any help/suggestions you may be able to offer.
Chris
Attachments:
example2.vi ‏25 KB

Other then using a least square method I dont have a function defined yet (trying to figure out what function to use), but essentially I am trying to find out how much of each of the adjustment matrices need to be applied to minimize the original matrices..
I hope that explains what i am trying to do a little better

8.1 fixes great circle calculations!

8.1 fixes the great circle calculations in travel books. You can finally go from LAX to AKL without going over USA, Atlantic, Africa, Indian Ocean... Looking forward to finally ordering my travel books...
Radar-
rdar://6467664
Threads-
http://discussions.apple.com/thread.jspa?threadID=1886068

Now that is GOOD NEWS!
LN

Least square linear-phase FIR filter

I need to geta second order derivative of an array based on 2 stage filtering with a least square linear phase FIR "differentiator " filter. Previously this was done using the matlab routine firls using the "differentiator" tag. Any ideas how this can be done in LabView?
Thanks in advance.

I don't believe that LabVIEW has any differentiation functions that use this algorithm. The only derivative function is located in the analyze, signal processing, time domain. You would probably have to build your own.

Recently on my mpb I was editing a jpg using the shapes option and know notice that the heart shape no longer is an option to use. Anyone know why? The square, circle and lasso are still there.

Recently on my mpb I was editing a jpg using the shapes option and know notice that the heart shape no longer is an option to use. Anyone know why? The square, circle and lasso are still there.

I am not aware of a heart, square, circle or lasso shape i=for editing in iphoto for the Mac - Maybe you are thinking of iPhoto for IOS which has been discontinued and is not available under IOS 8
LN

On Wikipedia Firefox shows symbols big square,circle, triangles no text.

Lately when I go to Wikipedia no text is shown, only large symbols of squares, circles, triangles, etc. At first I thought it was censorship but I've seen it on a few other sites. My ISP said to get updates to Adobe Reader--it's done, but still see this jibberish. So I'm thinking maybe I'm missing an update of something else. I'm using free AVG virus protection and thought maybe it's not letting update to something in.
When I say big symbols, I mean big. I can't think of what else to try.
Thanks.

Can you attach a [http://en.wikipedia.org/wiki/Screenshot screenshot]?
Use a compressed image type like PNG or JPG to save the screenshot and make sure that you do not exceed the maximum file size (1 MB).
Such issues can be caused by a corrupted font.
Try to disable the website fonts as a test and try a few different default (serif/sans-serif) fonts.<br />
Tools > Options > Content : Fonts & Colors > Advanced ([ ] Allow pages to choose their own fonts, instead of my selections above)<br />
If that works then you need to reinstall the corrupted font.
Other things that need attention:
Your above posted system details show outdated plugin(s) with known security and stability risks that you should update.
*Shockwave Flash 10.0 r32
Update the [[Managing the Flash plugin|Flash]] plugin to the latest version.
*http://www.adobe.com/software/flash/about/

The covariance of the least square methods

what is the meaning of the covariance? In the least square method fitting problems ,if I should make it equal to zero??
If it isnt equal to zero ? what is the matter?
thanks for any one can explain it to me !
As a man you should be ....

Hi Sharad,
Try to rename the component name and reload+rebulid the project.
If there is any build errors try to repair the DC with classpath structure and deploy the DC in server.
Hope this helps you...
Regards,
Saleem Mohammad

Interest calculation based on Net Due Date

Hi guys: I want the interest calculation based on net due date and not document date or posting date.
I tried to check the box "ALWAYS CALCULATE INT FROM NET DUE DATE in prepare item interest calculation step, but system gives me message
"Do not select "Calc.intrst from net due date" for this int.calc.type
Message no. F7128"
Here are my questions:
1- how can i make the system to calculate interest only after the item is due for payment - right now its calculating anyday after the document date
2- Is this the correct place in configuration to do this? (ALWAYS CALCULATE INT FROM NET DUE DATE )
3- Also in T code FINT, how can i run interest posting for only one item rather than all that show up in test run? I tried selecting/highlighting only one but it posts all.
thanks much
brian

HI,
The system always calculates the interest from the document date of the invoice,
as of my knowledge there is no setting for the interest calculation from the net due date, so
what u need to do is when u are running the open item interest run u specify the period of only the date
from the net due date to required date as of u.
if u want to calculate the interest to paticular invoice and having two invoices
then u can run as per the document date and other thing is u can block the invoice for dunnig.
Regards,
Padma

Least square circle calculation on a series of data points

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