https://www.ptcusercommunity.com/t5/Mathcad/units-are-not-compatible/m-p/719805#M195045 <P>Pretty simple to see.</P> <P>You can't add apples to pears.</P> <P>M.Omax has unit N,</P> <P>M.k1 has unit kN*mm</P> <P>Those units are not the same, so you cannot add them, even if you squared the variables.</P> <P>&nbsp;</P> <P>Success!<BR />Luc</P> Fri, 19 Mar 2021 12:57:25 GMT LucMeekes 2021-03-19T12:57:25Z https://www.ptcusercommunity.com/t5/Mathcad/units-are-not-compatible/m-p/719539#M195043 <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Snímek obrazovky (200).png" style="width: 400px;"><img src="https://www.ptcusercommunity.com/t5/image/serverpage/image-id/39063iA4F5AC97E8EAADED/image-size/medium?v=v2&amp;px=400" role="button" title="Snímek obrazovky (200).png" alt="Snímek obrazovky (200).png" /></span>&nbsp;any idea ?</P> <P> </P> <P> </P> Fri, 19 Mar 2021 12:48:29 GMT https://www.ptcusercommunity.com/t5/Mathcad/units-are-not-compatible/m-p/719539#M195043 LD_9872416 2021-03-19T12:48:29Z https://www.ptcusercommunity.com/t5/Mathcad/units-are-not-compatible/m-p/719805#M195045 <P>Pretty simple to see.</P> <P>You can't add apples to pears.</P> <P>M.Omax has unit N,</P> <P>M.k1 has unit kN*mm</P> <P>Those units are not the same, so you cannot add them, even if you squared the variables.</P> <P>&nbsp;</P> <P>Success!<BR />Luc</P> Fri, 19 Mar 2021 12:57:25 GMT https://www.ptcusercommunity.com/t5/Mathcad/units-are-not-compatible/m-p/719805#M195045 LucMeekes 2021-03-19T12:57:25Z https://www.ptcusercommunity.com/t5/Mathcad/units-are-not-compatible/m-p/719821#M195053 <P>your first 3 moments are in N because 1/2 has no unit (it is a lenght?). Add a unit to 1/2 !</P> Fri, 19 Mar 2021 13:56:57 GMT https://www.ptcusercommunity.com/t5/Mathcad/units-are-not-compatible/m-p/719821#M195053 JXBWk 2021-03-19T13:56:57Z