NaN input to a sub-vi

Hi,
I have got a sub vi for finding out the derivative which has got a double input.
The sub-vi is inside a while loop and input going is double value only. but inside the sub-vi it is showing "NaN" input and the sub vi is giving an " NaN" output.
Thanks in advance
@nk
Solved!
Go to Solution.
Attachments:
Threshold.vi ‏124 KB

Ya actually I too felt because the input is going as a double and then inside sub Vi it is showing NaN .
That is why i got confused.
I have attached an extraction vi ,whose output is E1 and E2 from these two values am finding out the dx/dt( derivative). I have used Ni usb 5133 for the input of that extraction Vi
@nk
Attachments:
Extraction.vi ‏127 KB
Threshold.vi ‏127 KB

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    final double latRad = srcPt.y * my_degToRad;
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    final double rhoYo = my_earthRad * my_F / Math.pow(Math.tan(Math.PI/4.0 + latRad/2.0), my_n);
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        if( Double.isNaN( dstPt.x ) )
            System.out.println("======= dstPt.x is NaN");
        if( Double.isNaN( dstPt.y ) )
            System.out.println("======= dstPt.y is NaN");
        System.out.println("======= my_stdLat1 = " + my_stdLat1 );
        System.out.println("======= my_n = " + my_n );
        System.out.println("======= my_originLonRad = " + my_originLonRad );
        System.out.println("======= my_F = " + my_F );
        System.out.println("======= my_earthRad = " + my_earthRad );
        System.out.println("======= lonRad = " + lonRad );
        System.out.println("======= latRad = " + latRad );
        System.out.println("======= theta = " + theta );
        System.out.println("======= Math.tan(Math.PI/4.0 + latRad/2.0) = " + Math.tan(Math.PI/4.0 + latRad/2.0) );
        System.out.println("======= Math.pow(Math.tan(Math.PI/4.0 + latRad/2.0), my_n) = " + Math.pow(Math.tan(Math.PI/4.0 + latRad/2.0), my_n) );
        System.out.println("======= rho = " + rho );
        System.out.println("======= rhoYo = " + rhoYo );
        System.out.println("======= Math.sin(theta) = " + Math.sin(theta) );
        System.out.println("======= dstPt.x = " + dstPt.x );
        System.out.println("======= Math.cos(theta) = " + Math.cos(theta) );
        System.out.println("======= my_rhoZero = " + my_rhoZero );
        System.out.println("======= (rhoYo * Math.cos(theta)) = " + (rho * Math.cos(theta)) );
        System.out.println("======= my_rhoZero - (rhoYo * Math.cos(theta)) = " + (my_rhoZero - (rho * Math.cos(theta)) ));
        System.out.println("======= dstPt.y = " + dstPt.y );
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}And here's the sample output:
======= A _projected dstPt has NaNs. Dumping...vvvvvvvvvvvvvvvvvvvvvvvvvvvv
======= dstPt.x is NaN
======= dstPt.y is NaN
======= my_stdLat1 = 25.0
======= my_n = 0.42261826174069944
======= my_originLonRad = -1.6580627893946132
======= my_F = 2.5946660025799146
======= my_earthRad = 6371.2
======= lonRad = -2.7564670759053924
======= latRad = 0.3730758324037379
======= theta = -0.4642057102537187
======= Math.tan(Math.PI/4.0 + latRad/2.0) = 1.4652768116539785
======= Math.pow(Math.tan(Math.PI/4.0 + latRad/2.0), my_n) = 1.175224090766834
======= rho = NaN
======= rhoYo = 14066.369269924155
======= Math.sin(theta) = -0.44771270676160557
======= dstPt.x = NaN
======= Math.cos(theta) = 0.8941774612481554
======= my_rhoZero = 13663.082491950498
======= (rhoYo * Math.cos(theta)) = NaN
======= my_rhoZero - (rhoYo * Math.cos(theta)) = NaN
======= dstPt.y = NaN
======= A _projected dstPt had NaNs. Done dumping. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

HI JSchell (and others?) -
I have created a simple example attached below, that when run repeatedly, does indeed generate spurious NaNs. I have made it as simple as possible. In the code, I use my own lon/lat binary data file, though I am sure any will do. Let me know if anyone wants that file.
So the deal is that (with my data at least) this program should never generate NaN results. And if one runs it 25432 (eg: random #) times, it wont, but then the 25433th time, it will create NaNs, etc. ie: inconsistent NaN math results.
As I said before, I have run this on old and new Dell laptops under Windows XP, using java 1.5_02, 1.5_04 and 1.5_08. The latest run was on a brand new Dell with a Intel Core Duo T2600 processor, running XP. If this is a result of the Pentium bug, one would think that would be fixed by now. I have NOT yet tested on AMD, though I will do that this afternoon.
Remember, this ONLY happens with Windows Laptops.
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Here's the code that produces spurious NaNs:
import java.awt.geom.Point2D;
import java.io.DataInputStream;
import java.io.EOFException;
import java.io.File;
import java.io.FileInputStream;
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David Thomson Original Code Consulting
www.originalcode.com
National Instruments Alliance Program Member
Certified LabVIEW Architect
There are 10 kinds of people: those who understand binary, and those who don't.

Dave Thomson wrote:
5) I want the two trajectories to be different colors. Luckily there is a "color vector" input to the sub-vi that will probably do this. But I can find no documentation on it. You can't read this color vector with a property node, that I can find, so I can't get an example of the current color vector. I can see this color vector in the 3D Graph Properties page, but at that point, you can only change the colors of the over and under points, not the main color ramp. I tried specifying an array of color boxes, but didn't get reasonable results. I probably don't have the right number of elements. Interestingly, the Color Vector input is an array of reals! The context sensitive help for the sub-vi is useless. Isn't this documented somewhere?
Thanks for any help,
DaveT
CW 3d graph Example here.
To set the color ramp you need to set the colors and the values and you need the same number of elements in each array. You will also have to set the ramp style you want to custom.
Also note colrs are "BGR" not "RGB".
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

How to create a comment form in Flash CS3

I am trying to create an add comment form in Flash cs3. I
have the background design and the text input areas and sub mit
buttons. But how do I get the submit button to add the comment to a
different area in the same flash file? My inputs and buttons are on
the left side of the stage and my display comments is on the right
side of the stage. How do I connect the two?

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text to display in another, different, text area? If that's the
case then make that second text area a dynamic textfield and set
its text property to the text property of the input text
space.

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