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RE: Mathcad question
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- Subject: RE: Mathcad question
- From: "Structuralist" <dennis.wish(--nospam--at)gte.net>
- Date: Mon, 29 Jan 2001 22:28:38 -0800
Mark, I found this out when creating the spreadsheet for Lateral Design. My opinion has changed, as a fudge factor does not help the engineer understand how the formula was derived. We had a number of threads regarding the Diaphragm deflection calculations and many responded that the formula was derived empirically and therefore many of the values contained constants. However, one engineer (or two) wrote in with a more complete explanation that showed us how to derive the formulas and proving that there were no constants or empirical formulas based on "fudge factors" but rather a rational derivation from the common deflection formula for a uniform load applied on a simple beam. My point is that before assuming that you need to apply a fudge factor because the formula was written in part to be unitless, there may be another reason based on actual derivation where the units are accounted for. Just my opinion that we can't simply assume unitless formulas when we might learn more if we dig into the history of the formula. Dennis -----Original Message----- From: Mark Gilligan [mailto:MarkKGilligan(--nospam--at)compuserve.com] Sent: Monday, January 29, 2001 8:56 PM To: INTERNET:seaint(--nospam--at)seaint.org Subject: Re: Mathcad question While you are lobbying Mathsoft you might ask them to include a standard system of units where a pound "lb" has force units. Another difficulty that I have is if you implement many of the many of the formulas in the codes in Mathcad, you will find that you do not get the right units and the correct numerical value until you add a fudge factor. There should be a special function that takes the result of the numerical operations and assigns the desired units to the result. Mark Gilligan +++++++++++++++++++++++++++++++++++++++++++++++ > I just got an e-mail last week from the Mathsoft people (it took a long while for them to respond) on this very topic. There isn't any way to display intermediate results, which is too bad because this would make the calculations very readable and easy to spot errors. The reason given to me was that there probably wasn't enough interest in this feature to warrant Mathsoft incorporating it. Maybe we could form a lobby to get them to consider it! <
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