Getting different results for the same argument? Why

Forum|Forum|10 years ago
December 14, 2015
4 replies
2858 views

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, and how to overcome it?

Regards,

H

1_Glitch-in-MathCad-mcdx.zip

Other

W

Werner_E

25-Diamond I

This is an effect which you have to take in account when you are working with float numbers. Never compare float numbers for equality.

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.

WE