Convert float to Float

Hi,
How can I convert float to Float?
thanks
andrew

I got the answer myself, Float Q = new Float(q);

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Convert color to float

Hello!
I�m using a JColorChooser to pick a color and I wanted to convert this value in a float.
Using :
Color color = Painel_cores.getColor();
float[] myColor = { color.getRed(), color.getGreen(), color.getBlue() };
I get trash that can�t be used�
Using:
float corRed=color.getRed();
float corGreen=color.getGreen();
float corBlue=color.getBlue();
I get the 3 components separate. How ca I join them to have (255,255,255) ?
Thanks
Nuno

I�m using a JColorChooser to pick a color and I
wanted to convert this value in a float.A float array, I assume after reading the following:
Using :
Color color = Painel_cores.getColor();
float[] myColor = { color.getRed(), color.getGreen(),
color.getBlue() };
I get trash that can�t be used�That surprises me because you simply get a float array containing
three elements, all set to their correct values after being cast to type
float ...
Have you tried to print the three values and what were the results?
kind regards,
Jos

Convert int to float

How do I properly convert an int to a float?
I input a number such as 0x42c26163
The final number should be 97.19021
I thought I could just do a cast so I tried this:
int test = 0x42c26163;
float test2 = (float)test;
But test2 comes up 1.120035171 E9
How do I get to the final 97.19021?
In another project I'm working on using C#, the conversion works when I use the BitConverter class.
I'm sure I am just overlooking the obvious, but can someone can help me?

I suppose that int number is really the content of a float read back from raw memory or received from an instrument or on some communication channel. Rebuilding the float number has been discussed a couple of ways in the forums: I can suggest you look at this thread or this other one which give you feasible solutions.
This is basically a reflect of how floating point numbers are stored in memory according to IEEE754 standard, which you may want to take a look at to understand a bit how all the matter is treated.
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Convert Object to Float

Hello,
I'm trying to convert an Object to a Float and can't seem to get it to work properly. I'm using a HashMap to store object key-value pairs. The values inserted into the HashMap were originally of type float. I can extract the value found in the map, but I cannot then convert that to a float to be assigned to another variable. For example:
Object holdValue;
holdValue = someHashMap.get(someKey); // so far so good
float aFloatNumber = holdValue; // can't do this because
// holdValue stores an object
How do I convert "holdValue" from an Object to a float so that it can be assigned to "aFloatNumber"?
Thank you.

Well the keys could not have been of type float because float is a primative and HashMap will only take Objects as it's keys and data. So you have an incorrect notion of what is in your HashMap. If the key was a Float (the wrapper class of float) you can just cast it and you would be fine but there is no way to assign an Object to a float, you could convert threw some method (like fields 1 plus field 2 or something) but you can't just convert.

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 double to float

This problem only occurs when dealing with large numbers or numbers with a lot of fraction digits.
Here is an example:
double d = 7.1E9;
float f1 = (float)d;
float f2 = new Float(d).floatValue();
System.out.println( d + " " + f1 + " " + f2);
The result is:
7.1E9 7.1000003E9 7.1000003E9
I tried other ways of converting to float (using DecimalFormat) but unfortunately nothing works. The resulting float is not the same as the original double.
Any ideas?
Thanks.
Igor.

float is only 32 bit while double is 64 bit, so you can easily get differences like that.
Is it a problem? If you results gets inaccurate you should stay with double or use BigDecimal if you really care about the precision. If it's because you want to round the result of before you display it, you can use DecimalFormat.

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 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.

Converting Byte [] into float []

Hi, I read the contents of a file into a byte array and am now trying to convert it into a float array.
here is the code I am using
public static float [] bytetofloat(byte [] convert){
    float [] data = new float [convert.length/2];
    for(int i = 0;i<convert.length;i+=2){
        for(int j = 0; j <data.length;j++){
        short valueAsShort = (short)( (convert[i] << 8) | (convert[i+1] & 0xff));
        float valueAsFloat = (float)valueAsShort;
        System.out.println(valueAsFloat);
        valueAsFloat = data[j];
        System.out.println(data[j]);
    }can anyone see anythign wrong with the way I am doing this? I cant see anythign wrong but need to make sure its fine before I can continue.
any advice on this or a better way to do it would be much appreciated.

ultiron wrote:
I'm pretty sure they do. The way im doing it is by taking 2 byte values and changing them to a 16 bit float.
the way the bytes are shift they should only take up 16 bits.It's not that simple.
First, a float in Java is always 4 bytes. The fact that it has an integer value that can fit into two bytes is irrelevant
Second, floating point representation is not the same 2s complement that's used for byte, short, int, and long, so you're not just shifting the bits.
For eample:
1, int: 00000000 00000000 00000000 00000001
1, float: 00111111 10000000 00000000 00000000
-1, int: 11111111 11111111 11111111 11111111
-1, float: 10111111 10000000 00000000 00000000Having said that, you're casting, so your step of going from short to float is correct. It doesn't just shift; it does conversions like the above. The caveats are:
1) Is your conversion from bytes to short correct? That depends on what those bytes are supposed to be. If they're big-endian representations of 2-byte, 2s-complement numbers, then your code looks correct. You'll still have to test it of course. You'll want to focus on corner cases.
00 00 --> 0
00 01 --> 1
10 00 --> 4096
7f ff --> 32767
80 00 --> -32768
ff ff --> -1
2) Can float hold all of short's values? I think it can. It obviously can't hold all of int's values, but I think it's precision is sufficient to cover short.
By the way, is there a reason you're using float instead of double? Unless you're in an extremely memory-constrained environment, there's no reason to use double.

Looking for VI where i can convert covert a float number to Q 11.5 representation

looking for VI where i can convert covert a float number to Q 11.5 representation and what exactly Q 11.5 representation means.
Kindly help me on the same.
Solved!
Go to Solution.

Appears to be right, but don't forget to round to the nearest integer.
http://zone.ni.com/reference/en-XX/help/371361H-01/glang/round_to_nearest/
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Converting Vector with Floats to float[] typecast error?

Java Developers,
I am able to convert my String vector to a
String[] but just can't get the Vector with Floats to be converted to a float[] array. I have looked into google and java.sun.com Forums but still cant seem to find the answer. I would really appreciate your help!
This is how I am making the conversion from Vector(String) to String[]:
legendLabelsArray = new String[columnHeads.size()];
int k=0;
Iterator e = columnHeads.iterator();
while(e.hasNext()){
System.out.println("inside the enumerator");
legendLabelsArray[k] = e.next().toString();
System.out.println("Array elements at " + k + " are " + legendLabelsArray[k]);
System.out.println(k++);
How can I make something similar to work with a Vector with Floats to float[] instead of Strings?
Thanks,
Musaddiq
[email protected]

Something like this ...
float[] floatArray = new float[vectorOfFloats.size()];
int k=0;
Iterator e = vectorOfFloats.iterator();
while(e.hasNext()){
floatArray[k] = ((Float) e.next()).floatValue();
k++;

Cannot explicit convert double.MaxValue/double.MinValue/float.MaxValue/float.MinValue to decimal

I'm try set double.MaxValue/double.MinValue/float.MaxValue/float.MinValue to NumericUpDown's Maximun/Minimum
It fail (compile error)
but variable and constant's explicit conversion is OK.
can anyone tell me why?
the screenshot is in below
http://i.imgur.com/woZXr0i.png

yes, your right!
I has been tried
If I assign it(MinValue/MaxValue) to a variable first and then explicit convert to a decimal
it will be pass compile, but it will throw exception when runtime
screenshot
http://i.imgur.com/TpD8guJ.png

Convert float to Float lost precision?

Hi all,
float r = 3.456789012f;
Float R = new Float(r);
System.out.println (R.toString());
float y = R.floatValue();
System.out.println(y);
gives 3.4567890 in both cases.
Is the precision being truncated when changing from float to Float?
any help please to ensure all precision can be maintained?
thanks
andrew

Is the precision being truncated when changing from
float to Float?
Nope. Try System.out.println(r).
any help please to ensure all precision can be
maintained?
Nope. The float data type can't handle that much precision. You can use double to get a bit better precision, and the java.math.BigDecimal class to get arbitrary precision.

Conversion Vector of Floats to float[]: exception?

Java Developers,
I am able to convert my String vector to a
String[] but just can't get the Vector with Floats to be converted to a float[] array. I have looked into google and java.sun.com Forums but still cant seem to find the answer. I would really appreciate your help!
This is how I am making the conversion from Vector(String) to String[]:
legendLabelsArray = new String[columnHeads.size()];
int k=0;
Iterator e = columnHeads.iterator();
while(e.hasNext()){
System.out.println("inside the enumerator");
legendLabelsArray[k] = e.next().toString();
System.out.println("Array elements at " + k + " are " + legendLabelsArray[k]);
System.out.println(k++);
How can I make something similar to work with a Vector with Floats to float[] instead of Strings?
Thanks,
Musaddiq
[email protected]

Assuming Vector v with Float elements:
float[] a = new float[v.size()];
int n = 0;
for (Iterator i = v.iterator(); i.hasNext(); )
a[n++] = ((Float) i.next()).floatValue();

How to treat group propertys of float as float?

There is a group names "groupname" with a extra property
(Zusatzeigenschaft) named "X" of type float64. It's value is
"1,5"
Try this script:
msgbox GroupPropGet(GroupIndexGet("groupname") ,"X")
msgbox CStr(GroupPropGet(GroupIndexGet("groupname") ,"X"))
msgbox CDbl(CStr(GroupPropGet(GroupIndexGet("groupname") ,"X")))
msgbox CDbl(GroupPropGet(GroupIndexGet("groupname") ,"X"))
The last two outputs are different and wrong!
I need a (SUD-)dialog to edit a propperty of type float. For this I
have to convert it to string and after editing to convert back to
float.

I guess the problem is the decimalsign (dot / comma)
Try this little function
Option Explicit
msgbox GroupPropGet(GroupIndexGet("groupname") ,"X")
msgbox CStr(GroupPropGet(GroupIndexGet("groupname") ,"X"))
msgbox StringToFloat(CStr(GroupPropGet(GroupIndexGet("groupname") ,"X")))
'''Function to convert a string to a float value
Function StringToFloat(sInput)
Dim sDecimalCharacter
Dim sTempValue
If IsNumeric(sInput) Then
    'Determine the decimalsign (which depends on the regional settings)
    sDecimalCharacter = Mid(1.1, 2, 1)
    If Instr(sInput, ".") > 0 Then
      sTempValue = Replace(sInput, ".", sDecimalCharacter)
    Else
      sTempValue = Replace(sInput, ",", sDecimalCharacter)
    End if
    StringToFloat = CDbl(sTempValue)
Else
    StringToFloat = Null
End If
End Function

Convert float to Float

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