Genauigkeit einer Zahl

[Angelo2449]

Hallo alle,
Ich kann den Vergleich zwischen zwei Zahlen nicht kontrollieren, weil, glaube ich, die Genauigkeit durch die Näherung:

... 3313.1139,431.0565
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

< wird mit drei Dezimals (431.057) zurückgegeben, während die eingehenden Daten
> (substr ele1 (+ pos1 2)) < hat vier Zeichen nach Punkt (431.0565).
Wie kann ich mehr Dezimals haben?
Variablen werden so eingestellt :
(setvar "dimdec" 8)
(Setvar "luprec" 4)
Danke.

 

[rpor66]

atof schafft keine Annäherung:
(Setq v "431.0565")
(Sectq) c) (atof v) -> 431.057 (Ansicht 3 Dezimals)
(Setq c1 (rtos) c) 2 4) -> "431.0565"
Also, c) hat 4 Dezimalziffern.
um reale Zahlen zu vergleichen (doppelte Genauigkeit) verwendet gleiche Anzeige wie viele Dezimalzahlen betrachten.

 

[Angelo2449]

Danke rpor66,
Was ist > gleich <? Ich kann sie nicht in den Anweisungen finden.

 

[Angelo2449]

Ich habe mein Problem gelöst, indem ich den Wert der als Vergleich verwendeten Nummer stabilisierte:

 (setq cadrzeros (rtos (cadr poszero) 2 4)
(setq cadrzero (atof cadrzeros)); Vergleichsnummer
...
...
(falls (< (tof (substr ele1 (+ pos1 2))) cadrzero) ; so funktioniert der Vergleich immer

 

[rpor66]

http://docs.autodesk.com/acd/2011/enu/filesalr/ws1a9193826455f5ff1a32d8d10ebc6b7ccc-6a38.htm