Arrays.sort( ) Problem

[fatfox]

Hallo alle,

Ich habe ein Problem mit [c]Arrays.sort( )[/c].

Ich habe ein array (Type: float[ ] ), warum nach dem [c]Arrays.sort( )[/c] verändert die Summe des Arrays?

Hier ist meine Code:

1. zuerst lese ich die Daten in array a1[ ];
2. berechne ich die Summe des Arrays;
3. Nach Arrays.sort( ), berechne ich die Summe des Arrays;

Ausgabe:
Vor dem Arrays.sort(): sum = 1778.062
Nachdem Arrays.sort(): sum = 1778.063

Warum ist das Ergebnis um 0.001 unterschied? [c]float[/c] hat doch nach Komma 7 stellige Genauigkeit, oder?


Vielen Dank für eure Hilfe!

Hier ist meine Code:

		// Initialize the array a1[]
		String line = 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		String[] line_ele = line.split(",");
		float[] a1 = new float[line_ele.length];
		for(int i = 0;i<line_ele.length;i++) {
			a1[i] = Float.parseFloat(line_ele[i]);
		}		
		
		// Calculate the sum without Arrays.sort();
		float sum = 0;
		for(int i = 0;i<a1.length;i++){
			sum += a1[i];
		}
		System.out.println("Vor dem Arrays.sort(): sum = "+sum);
		
		
		// Calculate the sum with Arrays.sort();
		sum = 0;
		
		Arrays.sort(a1);
		
		for(int i = 0;i<a1.length;i++){
			sum += a1[i];
		}
		System.out.println("Nachdem Arrays.sort(): sum = "+sum);
		
	}

 

[thE_29]

Das ist die Unschönheit bei Gleitkommazahlen.. Hat IMHO fast jede Programmiersprache (zumindest bei Java und C kann ichs fix sagen 😀).

Mit Double gehts genauer oder gleich mit BigDecimal... Es gibt aber auch ein Keyword, nur fällt mir das grad nicht ein..

 

[MySelV]

Hi,

ich würde dir BigDecimal ans Herz legen. Zwar rechnet auch BigDecimal in besonderen Fällen nicht korrekt, da intern auch double genutzt wird, aber schon sehr viel besser als float. Ganz sicher ist man nur mit long und der Angabe von Nachkommastellen (wofür Java aber immernoch keine gekapselte Klasse besitzt)

Grüße

 

[fatfox]

Hi thE_29, aus Ram Grund darf ich leider nur [c]float[/c] float nehemen. 🙁

Was soll ich jetzt machen? soll ich Arrays.sort( ) order nicht? Welches Ergebnis ist richtig?

 

[fatfox]

Hi thE_29 und MySelV,

Alle Element in array ai[ ] haben höchsten nach dem Komma 4 Stelle. Also, [c]float[/c] reicht absolut. Nachdem Addieren, soll die Summe auch höchsten 4 Stellen nach dem Komma haben...

Ich finde, das Problem mit float vielleicht nicht zutun.

Woran ist der Fehler? Hat der Arrays.sort( ) meine [c]ai[ ][/c] verändert oder nicht?

 

[thE_29]

Tjo, da wirste immer ne Unschönheit haben..
Deswegen arbeitet man dort wo es genau gehen soll, auch immer mit Ganzzahlen (Kommazahl * 1000 oder gar 10000).

Der Fehler liegt einfach an den Gleitkommazahlen.. Die sind zu ungenau! Das kann dir beim Addieren auch passieren siehe hier:
http://javathreads.de/2009/03/niemals-mit-den-datentypen-float-oder-double-geldbetraege-berechnen/

 

[fatfox]

Hi, thE_29 und MySelV, vielen dank! Ich werde den Text mal gut lesen.

Aber das Problem ist wirklich so komisch, ich habe gestern ganze Nacht durch gesucht... 🙁

 

[thE_29]

So, habe endlich das Keywort gefunden 😀
Dh, strictfp

Probier mal das Wort bei deiner Klasse wo du rechnest/sortiest, davor hinzuschreiben!
Also

strictfp public class Rechne

 

[fatfox]

So, habe endlich das Keywort gefunden 😀
Dh, strictfp

Probier mal das Wort bei deiner Klasse wo du rechnest/sortiest, davor hinzuschreiben!
Also

strictfp public class Rechne

Ich habe die "strictfp" hinzugefügt, aber bekomme ich den gleich Ergebnis. Ich bin nicht sicher, ob ich richtig gemacht habe oder nicht. Ich habe nur "strictfp" hinzugefügt, sonst nicht.
Hier ist die Code:

	strictfp public static void testa(){
		
		// Initialize the array a1[]
		String line = 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		String[] line_ele = line.split(",");
		float[] a1 = new float[line_ele.length];
		int[] a2 = new int[line_ele.length];
		for(int i = 0;i<line_ele.length;i++) {
			a1[i] = Float.parseFloat(line_ele[i]);
		}
		for(int i=0;i<a2.length;i++){
			
		}
		
		// Calculate the sum without Arrays.sort();
		float sum = 0;
		for(int i = 0;i<a1.length;i++){
			sum += a1[i];
		}
		System.out.println("Vor dem Arrays.sort(): sum = "+sum);
		
		
		// Calculate the sum with Arrays.sort();
		sum = 0;
		
		Arrays.sort(a1);
		
		for(int i = 0;i<a1.length;i++){
			sum += a1[i];
		}
		System.out.println("Nachdem Arrays.sort(): sum = "+sum);
		
	}

 

[MySelV]

Hi,

nicht an die main() sondern an die Klasse. Auch wenn es so eigentlich auch gehen sollte oder????:L

Grüße

 

[fatfox]

Hi,

nicht an die main() sondern an die Klasse. Auch wenn es so eigentlich auch gehen sollte oder????:L

Grüße

Ich habe eben auch vor meine Class eingesetztzt, aber auch das gleiche Ergebnis... (T_T)

 

[SlaterB]

zu strictfp kann ich nichts sagen, aber als Beitrag hier eine verkürzte Kombination von Zahlen:

public class Test {
    public static void main(String[] args) {
        float a = 2.8788f;
        float b = 0.711f;
        float c = 2.5286f;

        System.out.println(a + b + c);
        System.out.println(a + c + b);
    }
}

Ausgabe:

6.1183996
6.1184

 

[fatfox]

zu strictfp kann ich nichts sagen, aber als Beitrag hier eine verkürzte Kombination von Zahlen:

public class Test {
    public static void main(String[] args) {
        float a = 2.8788f;
        float b = 0.711f;
        float c = 2.5286f;

        System.out.println(a + b + c);
        System.out.println(a + c + b);
    }
}

Ausgabe:

6.1183996
6.1184

Cool! Eingentlich ist 6.1184 der richtige Lösung. Also, meinst du auch, man soll nicht mit float rechnen, nicht war?

Funktioniert Keyword eigentlich oder nicht?

 

[SlaterB]

kommt drauf an was man vorhat, wie genau das Ergebnis sein muss usw.,
bei 7 Stellen wie in deinen ersten Ergebnis wäre mir float etwas knapp,
wenn aber auf ganze Zahlen oder eine Stelle nach dem Komma rundest, dann ginge es doch

in diesem Fall wäre es noch genauer und speichermäßig sparsamer, in int zu rechnen,
jede Zahl mit 10.000 malnehmen (wenn 4 Stellen nach Komma), auf int runden, die ints addieren

 

[fatfox]

kommt drauf an was man vorhat, wie genau das Ergebnis sein muss usw.,
bei 7 Stellen wie in deinen ersten Ergebnis wäre mir float etwas knapp,
wenn aber auf ganze Zahlen oder eine Stelle nach dem Komma rundest, dann ginge es doch

in diesem Fall wäre es noch genauer und speichermäßig sparsamer, in int zu rechnen,
jede Zahl mit 10.000 malnehmen (wenn 4 Stellen nach Komma), auf int runden, die ints addieren

habe verstanden.

Als ich gestern Nachts den Fehler suchte, habe ich wirklich an Geistergeischite gedacht!Ich habe ein echtes Geister getroffen! Der setzt gerade in mein Computer! Σ( ° △ °|||)︴