AW: Question about precision.
- To: mathgroup at smc.vnet.net
- Subject: [mg38411] AW: [mg38405] Question about precision.
- From: Matthias.Bode at oppenheim.de
- Date: Sat, 14 Dec 2002 03:19:38 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
Hello Mr. Wen-Feng Hsiao, please try: N[Sqrt[13/10], 50] Best regards, Matthias Bode Sal. Oppenheim jr. & Cie. KGaA Koenigsberger Strasse 29 D-60487 Frankfurt am Main GERMANY Tel.: +49(0)69 71 34 53 80 Mobile: +49(0)172 6 74 95 77 Fax: +49(0)69 71 34 95 380 E-mail: matthias.bode at oppenheim.de Internet: http://www.oppenheim.de -----Ursprüngliche Nachricht----- Von: wfhsiao at libra.seed.net.tw [mailto:wfhsiao at libra.seed.net.tw] Gesendet: Freitag, 13. Dezember 2002 10:19 An: mathgroup at smc.vnet.net Betreff: [mg38405] Question about precision. Dear experts, I try to find the square root of 1.3, but obtain an not so correct answer. Could someone point me how to do? My trials are the followings. In[28]:= Sqrt[1.3] Out[28]= 1.14018 In[29]:= Precision[Sqrt[1.3]] Out[29]= 16 In[30]:= N[Sqrt[1.3], 50] Out[30]= 1.14018 In[31]:= 1.14018*1.14018 Out[31]= 1.30001 The more precise answer should be In[32]:= 1.140175425*1.140175425 Out[32]= 1.3 Thanks for your help! Wen-Feng Hsiao