topic Re: Getting different results for the same argument? Why in Mathcad https://www.ptcusercommunity.com/t5/Mathcad/Getting-different-results-for-the-same-argument-Why/m-p/275390#M107713 <HTML><HEAD></HEAD><BODY><P>Thank you</P></BODY></HTML> Mon, 14 Dec 2015 14:31:19 GMT h_nas 2015-12-14T14:31:19Z Getting different results for the same argument? Why https://www.ptcusercommunity.com/t5/Mathcad/Getting-different-results-for-the-same-argument-Why/m-p/275386#M107709 Hi All,Could you please have a look at the attached file and let me know why I am getting different answers?if the number in question is an input you I get the answer I am looking for, if the output is a result form say interpolation I will get wrong answer!!!Why, this is happening, Thu, 03 May 2018 14:49:39 GMT https://www.ptcusercommunity.com/t5/Mathcad/Getting-different-results-for-the-same-argument-Why/m-p/275386#M107709 h_nas 2018-05-03T14:49:39Z Re: Getting different results for the same argument? Why https://www.ptcusercommunity.com/t5/Mathcad/Getting-different-results-for-the-same-argument-Why/m-p/275387#M107710 <HTML><HEAD></HEAD><BODY><P>This is an effect which you have to take in account when you are working with float numbers. Never compare float numbers for equality.</P><P></P><P>Its a roundoff effect. While the interpolated value R should be exactly 17.85 its actually slightly smaller - approx. -3.5*10^(-15). Evaluate R-Rd to see it yourself.</P><P></P><P>WE</P></BODY></HTML> Mon, 14 Dec 2015 13:30:55 GMT https://www.ptcusercommunity.com/t5/Mathcad/Getting-different-results-for-the-same-argument-Why/m-p/275387#M107710 Werner_E 2015-12-14T13:30:55Z Re: Getting different results for the same argument? Why https://www.ptcusercommunity.com/t5/Mathcad/Getting-different-results-for-the-same-argument-Why/m-p/275388#M107711 <HTML><HEAD></HEAD><BODY><P>Hellow,</P><P></P><P>How can I overcome this issue then? Any advise</P></BODY></HTML> Mon, 14 Dec 2015 13:59:18 GMT https://www.ptcusercommunity.com/t5/Mathcad/Getting-different-results-for-the-same-argument-Why/m-p/275388#M107711 h_nas 2015-12-14T13:59:18Z Re: Getting different results for the same argument? Why https://www.ptcusercommunity.com/t5/Mathcad/Getting-different-results-for-the-same-argument-Why/m-p/275389#M107712 <HTML><HEAD></HEAD><BODY><P>On the "Calculation" tab, select "Calculation Options" and "Approximate Equality".</P></BODY></HTML> Mon, 14 Dec 2015 14:27:27 GMT https://www.ptcusercommunity.com/t5/Mathcad/Getting-different-results-for-the-same-argument-Why/m-p/275389#M107712 RichardJ 2015-12-14T14:27:27Z Re: Getting different results for the same argument? Why https://www.ptcusercommunity.com/t5/Mathcad/Getting-different-results-for-the-same-argument-Why/m-p/275390#M107713 <HTML><HEAD></HEAD><BODY><P>Thank you</P></BODY></HTML> Mon, 14 Dec 2015 14:31:19 GMT https://www.ptcusercommunity.com/t5/Mathcad/Getting-different-results-for-the-same-argument-Why/m-p/275390#M107713 h_nas 2015-12-14T14:31:19Z