Calculation bug in f(x) parameter window

magnusn — Tue, 16 Jan 2024 13:44:13 GMT

Hi,

I sometimes use the user parameters in the f(x) parameter window to calculate areas, forces, speeds etc to help me with the design, since the software supports a large set of physical parameters. For some time (years actually), I have noticed that inventor tries to fix some calculations by adding parentheses wrongly. This time I wanted to calculate the total area of a set of round holes, but when writing PI * d_holes^2 / 4 * n_holes, Inventor incorrectly turned it into (PI * d_holes) ^ 2 ul / 4 ul * n_holes, which of course yields an error of a huge magnitude. Still, it might not be that easy to spot instantly, like other autocorrected mistakes including very obvious ones.

I solved it by adding some parentheses myself: PI * ( d_holes ^ 2 ) / 4 ul * n_holes, which Inventor further changed to PI * ( (d_holes) ^ 2 ul ) / 4 ul * n_holes. Unfortunately, I don't recall with certainty if any other formulas has been autocorrected wrongly, but at least formulas similar to this one, with pi multiplied by a radius or diameter squared, have been subject to the error.

I use inventor Professional 2023. Perhaps this error is fixed in newer versions, and if so, all is well. If not, then please try to fix this. It might cause some major design errors if not noticed and corrected.

Re: Calculation bug in f(x) parameter window

davidt162003 — Wed, 17 Jan 2024 16:38:12 GMT

This should definitly go to the ideas board

topic Re: Calculation bug in f(x) parameter window in Inventor Forum

Calculation bug in f(x) parameter window

Re: Calculation bug in f(x) parameter window