Using Floating Point

I write mobile java program using float point operations
but i instal to the mobile as a jar file
the mobile refuse that and give a message: "No supported floating point"
so what the solution for this problem

Recently I have to do a project where the main task is to port a J2SE application to J2ME. The J2SE application was full of floating point operation and as per my knowledge J2ME does not support floationg point operation due to low memory availability. So I have converted all the floating point operations to fixed point. I found no other way to execute floating point operations :-(

Similar Messages

Can I create a java app for my palm zire 71 that uses floating point calc

I am an eclipse user that is looking at studio creator 2 and was wondering if I could create a java app for my palm zire 71. I have read alot about no floating point support in midp... is that true for java on the palm? If so, how does one calculate with floats and doubles to do sqrt functions etc?
Thanks in advance for your time
Dean-O

I looked at netbeans and it does not support floating points in midlets. Not good for palm app if no floating point ability. J2ME supports floating point but in netbeans... is uses midlets and there are no floating points. Now what does one do? Not that dreaded C++
THanks in advance
Dean-O

Serial Communication(CAN) of Floating Point Numbers

Hi,
I have ran into a situation were I need to use floating point numbers(IEEE Floating Standard) when communicating. How can I send and recieve floating point numbers? What converstions need to be made? Is there a good resource on this?
Thanks,
Ken

Hi K.,
in automotive a lot of fractional values are exchanged via CAN communication, but still the CAN protocol is based on using integer numbers (of variable bit size)…
We are thinking we need to use single SGL floats ... that require a higher resoultion and precision
What is the needed resolution and "precision"? SGL transports 23 bits of mantissa: you can easily pack them into an I32 value!
Lets make an example:
I have a signal with a value range of 100…1000 and a resolution of 0.125. To send this over CAN I need to use 13 bits and scale the value with a gain of 0.125 and an offset of 100. Values will be send in an integer representation:
msgdata value
0 100
500 162.5
501 162.625
1000 225
5000 725
7200 1000
The formula to translate msgdata to value is easy: value := msgdata*gain+offset.
Another example: the car I test at the moment sends it's current speed as 16 bit integer value with a range of 0…65532. The gain is 0.01 so speed translates to 0.00…655.32 km/h. The values 65533-65535 have special meanings to indicate errors…
So again: What is your needed resolution and data range?
Another option: send the SGL as it is: just 4 bytes. Receive those 4 bytes on your PC as I32/U32 and typecast them to SGL…
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

The BIG failure of the floating point computation

The Big failure of the floating point computation .... Mmmm
You are writing some code .. writing a simple function ... and using type Double for your computation.
You are then expecting to get a result from your function that is at least close to the exact value ...
Are you right ??
Let see this from an example.
In my example, I will approximate the value of pi. To do so, I will inscribe a circle into a polygon, starting with an hexagon, and compute the half perimeter of the polygon. this will give me an approximation for pi.
Then I will in a loop doubling the number of sides of that polygon. Therefore, each iteration will give me a better approximation.
I will perform this twice, using the same algorithm and the same equation ... with the only difference that I will write that equation in two different form
Since I don't want to throw at you equations and algorithm without explanation, here the idea:
(I wrote that with Word to make it easier to read)
====================
Simple enough ...
It is important to understand that the two forms of the equation are mathematically always equal for a given value of "t" ... Since it is in fact the exact same equation written in two different way.
Now let put these two equations in code
Public Class Form1
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
RichTextBox1.Font = New Font("Consolas", 9)
RichTextBox2.Font = New Font("Consolas", 9)
TextBox1.Font = New Font("Consolas", 12)
TextBox1.TextAlign = HorizontalAlignment.Center
TextBox1.Text = "3.14159265358979323846264338327..."
Dim tt As Double
Dim Pi As Double
'===============================================================
'Using First Form of the equation
'===============================================================
'start with an hexagon
tt = 1 / Math.Sqrt(3)
Pi = 6 * tt
PrintPi(Pi, 0, RichTextBox1)
'Now we will double the number of sides of the polygon 25 times
For n = 1 To 25
tt = (Math.Sqrt((tt ^ 2) + 1) - 1) / tt
Pi = 6 * (2 ^ n) * tt
PrintPi(Pi, n, RichTextBox1)
Next
'===============================================================
'Using Second Form of the equation
'===============================================================
'start with an hexagon
tt = 1 / Math.Sqrt(3)
Pi = 6 * tt
PrintPi(Pi, 0, RichTextBox2)
'Now we will double the number of sides of the polygon 25 times
For n = 1 To 25
tt = tt / (Math.Sqrt((tt ^ 2) + 1) + 1)
Pi = 6 * (2 ^ n) * tt
PrintPi(Pi, n, RichTextBox2)
Next
End Sub
Private Sub PrintPi(t As Double, n As Integer, RTB As RichTextBox)
Dim S As String = t.ToString("#.00000000000000")
RTB.AppendText(S & " " & Format((6 * (2 ^ n)), "#,##0").PadLeft(13) & " sides polygon")
Dim i As Integer = 0
While S(i) = TextBox1.Text(i)
i += 1
End While
Dim CS = RTB.GetFirstCharIndexFromLine(RTB.Lines.Count - 1)
RTB.SelectionStart = CS
RTB.SelectionLength = i
RTB.SelectionColor = Color.Red
RTB.AppendText(vbCrLf)
End Sub
End Class
The results:
The text box contains the real value of PI.
The set of results on the left were obtain with the first form of the equation .. on the right with the second form of the equation
The red digits show the digits that are exact for pi.
On the right, where we used the second form of the equation, we see that the result converge nicely toward Pi as the number of sides of the polygon increases.
But on the left, with the first form of the equation, we see the after just a few iterations, the function stop converging and then start diverging from the expected value.
What is wrong ... did I made an error in the first form of the equation?
Well probably not since this first form of the equation is the one you will find in your math book.
So, what up here ??
The problem is this:
What is happening is that at each iteration when using the first form, I subtract 1 from the radical, This subtraction always gives a result smaller than 1. Since the type double has a fixed number of digits on the left of the decimal
point, at each iteration I am loosing precision caused by rounding.
And after only 25 iterations, I have accumulate such a big rounding error that even the digit on the left of the decimal point is wrong.
When using the second form of the equation, I am adding 1 to the radical, therefore the value grows and I get no lost of precision.
So, what should we learn from this ?
Well, ... we should at least remember that when using floating point to compute a formula, even a simple one, as I show here, we should always check the exactitude of the result. There are some functions that a floating point is unable to evaluate.

I manually (yes, manually) did the computations with calc.exe. It has a higher accuracy. PI after 25 iterations is 3.1415926535897934934541990520762.
This means tt = 0.000000015604459512183037864437694609544 compared to 0.0000000138636291675699 computed by the code.
Armin
Manually ...
You did better than Archimedes.
He only got to the 96 sides polygon and gave up. Than he said that PI was 3.1427

Floating point Number & Packed Number

Hai can anyone tell me what is the difference in using floating point & packed Number .
when it will b used ?

<b>Packed numbers</b> - type P
Type P data allows digits after the decimal point. The number of decimal places is generic, and is determined in the program. The value range of type P data depends on its size and the number of digits after the decimal point. The valid size can be any value from 1 to 16 bytes. Two decimal digits are packed into one byte, while the last byte contains one digit and the sign. Up to 14 digits are allowed after the decimal point. The initial value is zero. When working with type P data, it is a good idea to set the program attribute Fixed point arithmetic.Otherwise, type P numbers are treated as integers.
You can use type P data for such values as distances, weights, amounts of money, and so on.
<b>Floating point numbers</b> - type F
The value range of type F numbers is 1x10*-307 to 1x10*308 for positive and negative numbers, including 0 (zero). The accuracy range is approximately 15 decimals, depending on the floating point arithmetic of the hardware platform. Since type F data is internally converted to a binary system, rounding errors can occur. Although the ABAP processor tries to minimize these effects, you should not use type F data if high accuracy is required. Instead, use type P data.
You use type F fields when you need to cope with very large value ranges and rounding errors are not critical.
Using I and F fields for calculations is quicker than using P fields. Arithmetic operations using I and F fields are very similar to the actual machine code operations, while P fields require more support from the software. Nevertheless, you have to use type P data to meet accuracy or value range requirements.
reward if useful

Convert Floating Point Decimal to Hex

In my application I make some calculations using floating point format DBL,and need to write these values to a file in IEEE 754 Floating Point Hex format. Is there any way to do this using LabVIEW?

Mike,
Good news. LabVIEW has a function that does exactly what you want. It is well hidden though...
In the Advanced/Data manipulation palette there is a function called Flatten to String. If you feed this funtion with your DBL precision digital value you get the IEEE-754 hexadecimal floating point representation (64 bit) at the data string terminal (as a text string).
I attached a simple example that shows how it works.
Hope this helps. /Mikael Garcia
Attachments:
ieee754converter.vi ‏10 KB

Has anybody used the Camera RAW filter on an OpenEXR, HDR or similar floating point color image?

I often work on floating point images rendered out of 3ds Max, specifically OpenEXRs, and I have been lately using the Camera RAW filter to do some image adjustments. There is one problem though, the float image does not load correctly into Camera RAW. It looks slightly over-exposed when loaded and it is nearly impossible to get it back to "scratch". Is Camera RAW not fully float capable? Camera RAW is a drunkard compositor's dream when doing color corrections on a floating point image, especially an image rendered out of a 3D application such as 3ds Max or Maya. Any thoughts?
Mark Kauffman
Technical Lead of Project Visualization
Parsons Brinckerhoff

For what it's worth I have seen this going back a loooong time. I've posted on the subject as well and have never gotten a solid answer. It just appears as though Photoshop considers it "already open, so no need to open it twice". I believe an uninitialized variable could be involved, since it's intermittent.
I have found a couple of choices for workarounds or workflow changes...
1. You can save the first-opened document opened (e.g., as a .PSD) somewhere. Then reopening the raw file will always open a second document.
2. You could consider opening the raw file just once, duplicating it as a second layer, then use Camera Raw as a filter. Obviously that doesn't avail Camera Raw of the raw data, but its usefulness depends on what you're trying to accomplish.
-Noel

Using iMovie footage in FCP: 32-bit floating point audio?

I'd like to use iMovie 7 to capture my DV footage because I like its cataloging and skimming features, and the way it splits up clips based on DV stops. I want to do my editing in Final Cut Pro 5. Unfortunately, I've found that the audio depth in the clips I've captured with iMovie is 32-bit floating point, rather than 16-bit integer, and FCP has to render the audio before it can play back. Strange, since the FCP browser says that the sequence I dropped the iMovie footage into IS 32-bit. Any ideas on how to get FCP to playback this bit depth without rendering, and without having to convert my footage?

Do a search here and you will find all kinds of post on this very subject.
The main problems with using iMove to capture for FCP are
1. iMovie and FCP capture in very different ways. iMovie captures footage as a DV stream, problematic for editing in FCP
2. iMovie captures will not give you the timecode from your tape... may or may not be important to you unless you ever need to recapture and reconnect the footage.
In short, if you are editing in FCP... capture with FCP. If you want to split the footage based on tape start/stop, use the Start Stop detect function after you have captured.
rh

Sending a floating point through serial using VISA

how do I send a floating point number through a serial port to my microcontroller using VISA Write

I would recommend the Flatten To String because of being able to change the endiness. Some systems want Big Endian while others want Little Endian. It is best to specify.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines

Floating point operations is slower when small values are used?

I have the following simple program that multiplies two different floating point numbers many times. As you can see, one of the numbers is very small. When I calculate the time of executing both multiplications, I was surprised that the little number takes much longer than the other one. It seems that working with small doubles is slower... Does anyone know what is happening?
public static void main(String[] args) throws Exception
        long iterations = 10000000;
        double result;
        double number = 0.1D;
        double numberA = Double.MIN_VALUE;
        double numberB = 0.0008D;
        long startTime, endTime,elapsedTime;
        //Multiply numberA
        startTime = System.currentTimeMillis();
        for(int i=0; i < iterations; i++)
            result = number * numberA;
        endTime = System.currentTimeMillis();
        elapsedTime = endTime - startTime;
        System.out.println("
        System.out.println("Number A)
Time elapsed: " + elapsedTime + " ms");
        //Multiply numberB
        startTime = System.currentTimeMillis();
        for(int i=0; i < iterations; i++)
            result = number * numberB;
        endTime = System.currentTimeMillis();
        elapsedTime = endTime - startTime;
        System.out.println("
        System.out.println("Number B)
Time elapsed: " + elapsedTime + " ms");
    } Result:
Number A) Time elapsed: 3546 ms
Number B) Time elapsed: 110 ms
Thanks,
Diego

Verrry interrresting... After a few tweaks (sum & print multiplication result to prevent Hotspot from removing the entire loop, move stuff to one method to avoid code alignment effects or such, loop to get Hotspot compile everything; code below),
I find that "java -server" gives the same times for both the small and the big value, whereas "java -Xint" and "java -client" exhibit the unsymmetry. So should I conclude that my CPU floating point unit treats both values the same, but the client/server compilers do something ...what?
(You may need to add or remove a zero in "iterations" so that you get sane times with -client and -server.)
public class t
    public static void main(String[] args)
     for (int n = 0; n < 10; n++) {
         doit(Double.MIN_VALUE);
         doit(0.0008D);
    static void doit(double x)
        long iterations = 100000000;
        double result = 0;
        double number = 0.1D;
        long start = System.currentTimeMillis();
        for (int i=0; i < iterations; i++)
            result += number * x;
        long end = System.currentTimeMillis();
        System.out.println("time for " + x + ": " + (end - start) + " ms, result " + result);
}

SQL Loader and Floating Point Numbers

Hi
I have a problem loading floating point numbers using SQL Loader. If the number has more than 8 significant digits SQL Loader rounds the number i.e. 1100000.69 becomes 1100000.7. The CTL file looks as follows
LOAD DATA
INFILE '../data/test.csv' "str X'0A'"
BADFILE '../bad/test.bad'
APPEND
INTO TABLE test
FIELDS TERMINATED BY "," OPTIONALLY ENCLOSED BY '"'
Amount CHAR
and the data file as follows
"100.15 "
"100100.57 "
"1100000.69 "
"-2000000.33"
"-100000.43 "
the table defined as follows
CREATE TABLE test
Amount number(15,4)
) TABLESPACE NNUT050M1;
after loading a select returns the following
100.15
100100.57
1100000.7
-2000000
-100000.4
Thanks in advance
Russell

Actually if you format the field to display as (say) 999,999,999.99, you will see the correct numbers loaded via SQL Loader.
null

32 bit Floating Point

Hello,
Running FCP 5.1
Having audio sync issues and was double checking my settings.
Although the sequence presets are at 16 bit, they are showing up in the browser as 32bit Floating Point.
Any thoughts?
I generally capture now at 30 minute increments and actually have always had this issue. FCP 4.5 and 5.1
all settings are where they should be.
although I do notice, obviously when the device is off, the audio output defaults to 'default' not to firewire dv.
thanks
iMac intel Mac OS X (10.4.8)

Some more details please. What hardware device are you sourcing the audio clips from? The likely culprit is your capture settings. What preset are you using? Check Audio/Video Settings-Capture Presets and see if the preset you've selected records audio as 32 bit. It will say in the right column after you've selected your preset.
If it says 32 bit there, click Edit to get the Capture Preset Editor. Under Quicktime Audio Settings, the Format field should give you a selection of sample rates and possibly alternate bit depths. If your only choice is 32 bit, (as it is for me when I capture audio via my RME, 32 bit Integer in my case) then you'd be well served by bringing those files into Peak or Quicktime and saving them as 16 bit Integer files to match your sequence settings.
If you've imported these files into FCP from an audio editor that can create 32 bit floating point audio files, eg Kyma, Sequoia, Nuendo, etc. then the same advice applies. The 32 bit files are much larger than they need to be and may upset the apple cart (he he, pun) when pulled into a sequence with different settings. More cpu overhead for sure.
Let us know what you find.

Reading Floating Point PLC5 Registers Kills my ability to write to any register

When ever I create an object that reads a PLC5 Floating Point Register(F8:5),it kills my ability to write to any other PLC register. The problem only shows up with Floating Point registers. If I use integer registers (N7:121 etc.)I can read/write fine. It also severely slows down my normal driver scan update time. Even though it is set to scan every 30 seconds, I may only get an update every few minutes. Anyone else ever run into this? Thanks in advance!

Hi,
It might be helpful creating a log file to monitor com port activity.
Here's the Knowledgebase article about it.
http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/cac576863ff648a186256b5900794761?OpenDocument
Another way to check the serial port activity would be using "portmon"
software available at
http://www.sysinternals.com/ntw2k/freeware/portmon.shtml
I hope this helps.
Remzi A.
Applications Engineering
National Instruments

Cannot get Oracle 10g to start on a G5. Floating point exception

After a very painful 10g (EE) installation process i.e fixing all the following:
1) Created the missing /opt directory
2) Installation of XCode 1.2
3) Fixing the root.sh file
4) Downloaded the crstl file provided by Ron
5) Copied /etc/oratab/oratab to /etc/oratab
I tried bringing up the Oracle 10g instance by logging onto Sql*Plus as sysdba and running
startup nomount pfile ='/Users/oracle/admin/db01/scripts/init.ora''. The instance comes up for a few socunds and crashes. This is what i get in the alert.log
==========================================================
Sat Jul 17 11:40:08 2004
Starting ORACLE instance (normal)
LICENSE_MAX_SESSION = 0
LICENSE_SESSIONS_WARNING = 0
Picked latch-free SCN scheme 2
KCCDEBUG_LEVEL = 0
Using LOG_ARCHIVE_DEST_10 parameter default value as USE_DB_RECOVERY_FILE_DEST
Autotune of undo retention is turned on.
Dynamic strands is set to TRUE
Running with 2 shared and 18 private strand(s). Zero-copy redo is FALSE
IMODE=BR
ILAT =18
LICENSE_MAX_USERS = 0
SYS auditing is disabled
Starting up ORACLE RDBMS Version: 10.1.0.3.0.
System parameters with non-default values:
processes = 150
sga_target = 146800640
control_files = /Users/oracle/oradata/db01/control01.ctl, /Users/oracle/oradata/db01/control02.ctl, /Users/oracle/oradata/db01/control03.ctl
db_block_size = 8192
compatible = 10.1.0.2.0
db_file_multiblock_read_count= 16
db_recovery_file_dest = /Users/oracle/flash_recovery_area
db_recovery_file_dest_size= 2147483648
undo_management = AUTO
undo_tablespace = UNDOTBS1
remote_login_passwordfile= EXCLUSIVE
db_domain =
dispatchers = (PROTOCOL=TCP) (SERVICE=db01XDB)
job_queue_processes = 10
background_dump_dest = /Users/oracle/admin/db01/bdump
user_dump_dest = /Users/oracle/admin/db01/udump
core_dump_dest = /Users/oracle/admin/db01/cdump
db_name = db01
open_cursors = 300
pga_aggregate_target = 16777216
PMON started with pid=2, OS id=4037
MMAN started with pid=3, OS id=4039
DBW0 started with pid=4, OS id=4041
LGWR started with pid=5, OS id=4043
CKPT started with pid=6, OS id=4045
SMON started with pid=7, OS id=4047
RECO started with pid=8, OS id=4049
Sat Jul 17 11:40:16 2004
starting up 1 dispatcher(s) for network address '(ADDRESS=(PARTIAL=YES)(PROTOCOL=TCP))'...
CJQ0 started with pid=9, OS id=4051
Sat Jul 17 11:40:16 2004
starting up 1 shared server(s) ...
Sat Jul 17 11:40:18 2004
Errors in file /Users/oracle/admin/db01/bdump/db01_ckpt_4045.trc:
ORA-07445: exception encountered: core dump [semop+8] [SIGFPE] [Invalid floating point operation] [0xA0004CE4] [] []
Sat Jul 17 11:40:19 2004
Errors in file /Users/oracle/admin/db01/bdump/db01_mman_4039.trc:
ORA-07445: exception encountered: core dump [semop+8] [SIGFPE] [Invalid floating point operation] [0x41EDB3C] [] []
Sat Jul 17 11:40:21 2004
Errors in file /Users/oracle/admin/db01/bdump/db01_pmon_4037.trc:
ORA-00822: MMAN process terminated with error
Sat Jul 17 11:40:21 2004
PMON: terminating instance due to error 822
Instance terminated by PMON, pid = 4037
==========================================================
Any idea on what needs to be done to fix this error. I remember that i had the very same issue with the Oracle 9i R2 Developers release.
Any help will be greatly appreciated.

After a very painful 10g (EE) installation process
i.e fixing all the following:<snip>
Sat Jul 17 11:40:19 2004
Errors in file
/Users/oracle/admin/db01/bdump/db01_mman_4039.trc:
ORA-07445: exception encountered: core dump [semop+8]
[SIGFPE] [Invalid floating point operation]
[0x41EDB3C] [] []
Sat Jul 17 11:40:21 2004
Errors in file
/Users/oracle/admin/db01/bdump/db01_pmon_4037.trc:
ORA-00822: MMAN process terminated with error
Sat Jul 17 11:40:21 2004
PMON: terminating instance due to error 822
Instance terminated by PMON, pid = 4037==============================================> Any idea on what needs to be done to fix this error.
I remember that i had the very same issue with the
Oracle 9i R2 Developers release.
Any help will be greatly appreciated.You mentioned the 9ir2 release. Do you still have any reference to the 9ir2 software in your environment ? With a little luck you have, and in that case it not so hard to find a solution ...
Ronald.
http://homepage.mac.com/ik_zelf/oracle

How to gather a set of floating point numbers from a web page form?

I am pretty new to Java and I am working on a project to apply Benfords law to find the probability of digits submitted by the user. My first step is to gather set of floating point numbers from a web page. How do I go about doing this? Any suggestion or a proper site where I can learn this stuff will be highly appreciated.

I am using NetBeans IDE 5.5.1 and for this project. I have realized that the first question was not well phrased.
I created a web project with 2 jsp files and a class file in it. When my jsp file runs I ask the user to enter a number for finding the probablility based on Benfords law.
This is what I got so far:
This is input.jsp
<h1></h1>
Please enter a number to be checked
<form action="result.jsp" method="post">
<input type="number" name="number" >
<input type="submit" value="Check number">
</form>
</body>
</html>
This is result.jsp
String number=request.getParameter("number");

Using Floating Point

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