https://www.ptcusercommunity.com/t5/Mathcad/Linear-Interpolation/m-p/1026112#M218044 <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Capture.JPG" style="width: 623px;"><img src="https://www.ptcusercommunity.com/t5/image/serverpage/image-id/126043i7002B94A9D183F11/image-size/large?v=v2&amp;px=999" role="button" title="Capture.JPG" alt="Capture.JPG" /></span></P> <P>Cheers</P> <P>Terry</P> Wed, 23 Jul 2025 14:32:19 GMT terryhendicott 2025-07-23T14:32:19Z https://www.ptcusercommunity.com/t5/Mathcad/Linear-Interpolation/m-p/1026105#M218043 <P>Hello,</P><P>Attached is a Mathcad Prime 9 sheet. I would like to perform linear interpolation as explained in the sheet. Thank you for your help.</P><P>&nbsp;</P><P>&nbsp;</P><P>Best regards,</P><P>Sam</P><P>&nbsp;</P><P>&nbsp;</P> Wed, 23 Jul 2025 13:22:07 GMT https://www.ptcusercommunity.com/t5/Mathcad/Linear-Interpolation/m-p/1026105#M218043 SFares 2025-07-23T13:22:07Z https://www.ptcusercommunity.com/t5/Mathcad/Linear-Interpolation/m-p/1026112#M218044 <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Capture.JPG" style="width: 623px;"><img src="https://www.ptcusercommunity.com/t5/image/serverpage/image-id/126043i7002B94A9D183F11/image-size/large?v=v2&amp;px=999" role="button" title="Capture.JPG" alt="Capture.JPG" /></span></P> <P>Cheers</P> <P>Terry</P> Wed, 23 Jul 2025 14:32:19 GMT https://www.ptcusercommunity.com/t5/Mathcad/Linear-Interpolation/m-p/1026112#M218044 terryhendicott 2025-07-23T14:32:19Z https://www.ptcusercommunity.com/t5/Mathcad/Linear-Interpolation/m-p/1026118#M218045 <P>This should do it. You may need to recalculate the sheet.</P> <P>Note that you don't need the IF statements. The function linterp will do extrapolation from the last two points on either side of the range, so just extend the range with an extra point on either side...</P> <P>&nbsp;</P> <P>Success!<BR />Luc</P> Wed, 23 Jul 2025 14:51:39 GMT https://www.ptcusercommunity.com/t5/Mathcad/Linear-Interpolation/m-p/1026118#M218045 LucMeekes 2025-07-23T14:51:39Z https://www.ptcusercommunity.com/t5/Mathcad/Linear-Interpolation/m-p/1026132#M218047 <P>Thank you so much, Terry!</P> Wed, 23 Jul 2025 15:03:25 GMT https://www.ptcusercommunity.com/t5/Mathcad/Linear-Interpolation/m-p/1026132#M218047 SFares 2025-07-23T15:03:25Z https://www.ptcusercommunity.com/t5/Mathcad/Linear-Interpolation/m-p/1026135#M218048 <P>Wonderful and I appreciate it. Thanks alot, Luc!</P> Wed, 23 Jul 2025 15:04:39 GMT https://www.ptcusercommunity.com/t5/Mathcad/Linear-Interpolation/m-p/1026135#M218048 SFares 2025-07-23T15:04:39Z