Convert string to floating-point

Hi all,
..very basic question, but I tryed it for hours and only received short-dumps
<b>How can I convert a string into a floating-point number?</b>
Kind regards,
Stefan

hi
try this
to convert string to float.
data : a type f,
s type string value '1.023'.
a = s.
write :/ a.
to convert float to string.
data : a type f value '1.023',
s type string.
s = a.
write : s.

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Converting string to float

I have a decimal string "122339994" which i am trying to convert to float using Float.parseFloat. This results in incorrect value of 1.22339992E8.
I thought for floats precsision comes into effect after decimal places.
public static void main(String[] args) {
String floatString = "122339994";
float floatNumber = Float.parseFloat(floatString);
System.out.println("Float is "+floatNumber+". Now double "+Double.valueOf(floatString));
}

See this API
[Java2SE Float|http://download-llnw.oracle.com/javase/6/docs/api/java/lang/Float.html#valueOf%28java.lang.String%29]
Note that trailing format specifiers, specifiers that determine the type of a floating-point literal (1.0f is a float value; 1.0d is a double value), do not influence the results of this method. In other words, the numerical value of the input string is converted directly to the target floating-point type. In general, the two-step sequence of conversions, string to double followed by double to float, is not equivalent to converting a string directly to float. For example, if first converted to an intermediate double and then to float, the string
"1.00000017881393421514957253748434595763683319091796875001d"
results in the float value 1.0000002f; if the string is converted directly to float, 1.0000001f results.
Its better to see the Java APIs first for any information, we will get almost all the information we need from APIs
Regards,
Venkatesh

Convert string to float

It seems extremely rudimentary but I haven't been able to find an answer yet.
I would like to pass in a string representing a human-readable floating point (ie, non IEEE 754) and get its value.
A straight up assignment of a string variable into a f variable doesn't work for thousand dividers. We would also need it for every scenarios:
123.456
123,456
123456
123456,789
123.456,789
123,456.789
all should be valid inputs and the resolution should be dependent on system setting for number formats.
I would like a built-in ABAP call with no manual processing. I'm sure this problem has been encountered thousands of times and solved thousands of times. No point reinventing the wheel.

Tested Code
Output as below
String : 123,456,789,123.456
String : 123456789123.456
Float : 1.2345678912345599E+11
DATA v_str TYPE STRING VALUE '123,456,789,123.456'.
DATA v_flt TYPE F.
WRITE: / 'String :', v_str. "With Commas
REPLACE ALL OCCURRENCES OF ',' IN v_str WITH ''.
WRITE: / 'String :', v_str. "Without Commas
CATCH SYSTEM-EXCEPTIONS ARITHMETIC_ERRORS = 1
CONVERSION_ERRORS = 2.
MOVE v_str TO v_flt.
ENDCATCH.
WRITE: / 'Float :', v_flt. "Float value

Converting binary to floating point?

ok, i am programming a little java program at the consulter
the main idea of the program is to convert a decimal number to IEEE (floating point)
i am almost done except the exponent part
i dont understand the logic behind it
so, for example:
-6.625 = 110.101 (binary)
after normalization it will be -1.10101 * 2^2
so the IEEE will be
1 10000001 10101000000000000000000
i understand the sign part and the fraction part
but i have no idea how the exponent part came like this
the book say that 129-127=+2 so the exponent is 10000001
da, where it came from ???
i will appreciate it if someone explain this part for me step by step
thank you,
Edited by: abdoh2010 on Jan 26, 2008 2:37 AM

got it
thank you for viewing my question

Parse string to floating points

Hi,
I'm trying unsucessfully to parse the following string out to multiple outputs of floating point. Any idea?
Input String:
              Data     1            5           8          11
                      15.134 12.682   3.583    0.534
Want output to look like
output1: 15.134
output2: 12.682
output3: 3.583
output4: 0.534
thanks,
Anh

Anh
If thats what you want then you can get around it. Just wire the error out from the scan from string to a case statement selector. It will automatically fill out the error and no error. Pass through the scan from string values through both cases. Like this
David
Message Edited by David Crawford on 05-12-2006 10:28 AM
Attachments:
Scan From String Error Defaults.jpg ‏13 KB

Problem in Converting string to float

Hi,
I am reading from textField and trying to convert that string value to float.
Compiler is giving error cannot find symbol toFloat even though I have included java.lang in my program.
Please help me with this one.
Thanks.

Use
float f = Float.parseFloat(inputString); //where inputString is the string you want to parse

Converting string to float number

Here's what I'm trying to do. The user types a number, such as 12.011, in an input box. I want to check to see if the number they typed is between two numbers, such as 12 and 12.1. Therefore, I want to convert the string in the input box to a float number, not an integer, so I can check to see if it's in the correct range. How do I convert a string into a float number?
thanks
Mark

Did you try:
Number(textinput1.text);
if(Number(textinput1.text)>12 && Number(textinput1.text)<12.1)

Right justification of floating point values

Hi all
i need to convert a incoming floating point value into (8.2) format i.e. (33678.9956 into 33678.99) i.e. spaces should be padded before if number of digits before decimal is less than 8 and i need to right justify all the incoming values..
pls help me in doing that through graphical mapping.

Hi Barry,
sorry, the format given in the previous post is incorrect...
the required format is just opposite to that..i.e. all DOTS in the same column.
hope my requirement is clear..
Regards,
Manohar

Using Floating Point

I write mobile java program using float point operations
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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 :-(

Convertion Hex String to 32bits Decimal floating point??

Hi,
I would like to know how to convert hexa like: 416b0ac3 in decimal 32bits floating-point. The result of this string is suppose to be 14.690127.
So i must be able to do:
From 32-bit Hexadecimal Representation To Decimal Floating-Point
Thanks for your support
RiderMerlin

RiderMerlin
You can use the typecast function to do this.
David
Message Edited by David Crawford on 09-06-2006 03:31 PM
Attachments:
Typecast to Single.jpg ‏6 KB

Convert from String to float

How do I convert from String to float?

Hi,
you can use a Double for example - assuming value is that string to parse
float f;
try { Double d = new Double(value); f = d.floatValue(); }
catch (NumberFormatException e) { f = 0.0; } // error - string value could not be parsed
// here use your float fHope, that helps
greetings Marsian
P.S.: the Double class is usefull for that, because you also can get intValue(), doubleValue() or longValue() out of it for example. The StreamTokenizer for example parses numbers also only to double.

BUG: Large floating point numbers convert to the wrong integer

Hi,
When using the conversion "bullets" to convert SGL, DBL and EXT to integers there are some values which convert wrong. One example is the integer 9223370937343148030, which can be represented exactly as a SGL (and thus exactly as DBL and EXT as well). If you convert this to I64 you get 9223370937343148032 instead, even though the correct integer is within the range of an I64. There are many similar cases, all (I've noticed) within the large end of the ranges.
This has nothing to do with which integers can be represented exactly as a floating point value or not. This is a genuine conversion bug mind you.
Cheers,
Steen
CLA, CTA, CLED & LabVIEW Champion
Solved!
Go to Solution.

Yes, I understand the implications involved, and there definetely is a limit to how many significant digits that can be displayed in the numeric controls and constants today. I think that either this limit should be lifted or a cap should be put onto the configuration page when setting the display format.
I ran into this problem as I'm developing a new toolset that lets you convert all the numeric formats into any other numeric format, just like the current "conversion bullets". My conversion bullets have outputs for overflow and exact conversion as well, since I need that functionality myself for a Math toolset (GPMath) I'm also developing. Eventually I'll maybe include underflow as well, but for now just those two outputs are available. Example:
I do of course pay close attention to the binary representation of the numbers to calculate the Exact conversion? output correctly for each conversion variation (there are hundreds of VIs in polymorphic wrappers), but I relied in some cases on the ability of the numeric indicator to show a true number when configured appropriately - that was when I discovered this bug, which I at first mistook for a conversion error in LabVIEW.
Is there a compliancy issue with EXT?
While doing this work I've discovered that the EXT format is somewhat misleadingly labelled as "80-bit IEEE compliant" (it says so here), but that statement should be read with some suspicion IMO. The LabVIEW EXT is not simply IEEE 754-1985 compliant anyways, as that format would imply the x87 80-bit extended format. An x87 IEEE 754 extended precision float only has 63-bit fraction and a 1-bit integer part. That 1-bit integer part is implicit in single and double precision IEEE 754 numbers, but it is explicit in x87 extended precision numbers. LabVIEW EXT seems to have an implicit integer part and 64-bit fraction, thus not straight IEEE 754 compliant. Instead I'd say that the LabVIEW EXT is an IEEE 754r extended format, but still a proprietary one that should deserve a bit more detail in the available documentation. Since it's mentioned several places in the LabVIEW documentation that the EXT is platform independent, your suspicion should already be high though. It didn't take me many minutes to verify the apparent format of the EXT in any case, so no real problem here.
Is there a genuine conversion error from EXT to U64?
The integer 18446744073709549568 can be represented exactly as EXT using this binary representation (mind you that the numeric indicators won't display the value correctly, but instead show 18446744073709549600):
EXT-exponent: 0x100000000111110b
EXT-fraction: 0x1111111111111111111111111111111111111111111111111111000000000000b
--> Decimal: 18446744073709549568
The above EXT value converts exactly to U64 using the To Unsigned Quad Integer "bullet". But then let's try to flip the blue bit from 0 to 1 in the fraction part of the EXT, making this value:
EXT-exponent: 0x100000000111110b
EXT-fraction: 0x1111111111111111111111111111111111111111111111111111100000000000b
--> Decimal: 18446744073709550592
The above EXT value is still within U64 range, but the To Unsigned Quad Integer "bullet" converts it to U64_max which is 18446744073709551615. Unless I've missed something this must be a genuine conversion error from EXT to U64?
/Steen
CLA, CTA, CLED & LabVIEW Champion

Converting strings to the floating number and plotting

Hello,
I have a question regardting converting string of numbers to the floating bumbers and plot for voltage vs. weight.
The load cell for the ADC resolution is 16 bits, and the voltage will be in between +-5 volts.
The problem, I have the most is converting the string of numbers to the floating numbers, in my case is the weight.
Attachments:
tunnelv1.vi ‏139 KB

When you say "string of numbers" do you mean an array? What is the specific issue you are having? You seem to have orange wires running all over the place. Give a small example demonstrating the problem.
Mike...
Certified Professional Instructor
Certified LabVIEW Architect
LabVIEW Champion
"... after all, He's not a tame lion..."
Be thinking ahead and mark your dance card for NI Week 2015 now: TS 6139 - Object Oriented First Steps

Profibus data type converting to floating point

Hi,
Is there an efficient way to convert the incoming data to the floating point in the NI cRIO Profibus system?
1) The system is : NI cRIO 9068 Controller with Comsoft profibus slave module. The lavview we are using is 2013.
2) We are using profibus slave example and are able to see a array of unsigned 8 bit data. Please see the Output data shown in the attachement.
3) On the other side of profibus system, thrid party profibus master are converting floating points and tranmit the converted data to NI profibus slave.
Attachments:
Screenshoot.png ‏7 KB

If it's just a matter of converting data types once you have the data in LabVIEW, you can always manually scale and convert the data using the arithmetic functions and the "To Double Precision Float" or "To Single Precision Float" functions. You just have to know what floating point value the unsigned byte integer corresponds to. Is that what you're asking?
If you're asking for a way to this inherently with the Profibus functions, I'm afraid I can't be of much help...
Ryan K.

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

Convert string to floating-point

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