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[mathcad] Re: Units

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[mathcad] Re: Units
Author: Bryce-hesterman    Posted: Sun, 29 Dec 2002 21:00:28 +0000
Alberto, Click on the result of your equation and you will see a black box to the left of the result. This box is for specifying how units will be displayed. Click on the box and type N*m. Click outside the box or hit enter. The units will now be displayed in Newton-meters. If you enter W*s in the units box, you get Watt- seconds. If you type part of the units of the result in the box, Mathcad will supply the rest. For example, if you type m, Mathcad will fill in the N. If you type ft, it will fill in 3.281*N. You can define your own units in terms of fundamental units, and Mathcad will handle those as well. This is one of the handiestt features of Mathcad, especially when you have to enter data using a combination of metric and English units. If NASA had been using Mathcad a few years ago, they might not have crashed a probe on Mars as a result of mismatched units in their calculations. Bryce Hesterman > Dear mcad-users, > > I have a little problem with mathcad units. If I multiply a Newton and a > meter, I obtain a Joule: this is not always true, but I don't know how to force > mcad to mantain 1 N x 1 m = 1 N x m. > > Do you have a suggestion? > > Thank you in advance and merry christmas, > > Alberto Borboni > Università degli Studi di Brescia > Italy --- The Mathcad List - Discussion, Support & News Contributions: /> Hosted by: Adept Scientific http://www.adeptscience.com List Archive: http://lists.adeptscience.co.uk/ --- Would you like this to come to a different email address? --- Simply leave the mailing list (see below) and re-join by sending a blank email from the new address to: or --- If you do not want to be on the Mathcad list, simply send a blank email (no subject or message needed) to: />

[mathcad] Re: Units
Author: Borboni    Posted: Tue, 31 Dec 2002 13:46:14 +0100
Thank you Bryce for your help. I have tried your suggestion, but I didn't be able to solve my problem. I send you a mcad 2001i example. Alberto. wrote: > Alberto, > > Click on the result of your equation and you will see a black box to the left > > of the result. This box is for specifying how units will be displayed. Click > on > the box and type N*m. Click outside the box or hit enter. The units will now > be > displayed in Newton-meters. If you enter W*s in the units box, you get > Watt- > seconds. > > If you type part of the units of the result in the box, Mathcad will supply > the > rest. For example, if you type m, Mathcad will fill in the N. If you type > ft, > it will fill in 3.281*N. > > You can define your own units in terms of fundamental units, and Mathcad will > > handle those as well. ------------------------------------------------- This mail sent through IMP: http://horde.org/imp/
Attachments:  units00.mcd

[mathcad] Re: Units
Author: Bryce Hesterman    Posted: Tue, 31 Dec 2002 14:10:11 -0700
Alberto, You need to type your desired units into the units box for each equation that displays a result. I have attached a modified version of your file. If you don't enter your desired units, the default units will be used. Bryce -----Original Message----- From: /> /> Sent: Tuesday, December 31, 2002 5:46 AM To: Mathcad Discussion List Subject: [mathcad] Re: Units Thank you Bryce for your help. I have tried your suggestion, but I didn't be able to solve my problem. I send you a mcad 2001i example. Alberto.
Attachments:  units00-BH.mcd

[mathcad] Re: Units
Author: Ted Diehl    Posted: Thu, 2 Jan 2003 09:30:58 -0500
Alberto, You can also force Mathcad to return base units instead of units like Joule, etc. Under the Format menu option, pick Result, then the tab Unit Display, and then UNCHECK "Simplify Units When Possible". In my opinion, the Simplify Units When Possible feature can be dangerous. One example is if you redefine the unit of Hz to be Hz = 2 Pi rad/sec (when a mechanical engineer would expect), the Simplify Units feature will not recognize this and will output results assuming Hz = 1 / sec. This type of error can be very dangerous since it causes an error orf more than 6 (which is huge for a frequncy in mechanical eng.). I wish that Mathsoft would make the DEFAULT be that this feature was unchecked. Maybe someday! ted diehl DuPont "Bryce Hesterman" on 12/31/2002 04:10:11 PM Please respond to /> To: Mathcad Discussion List /> cc: Subject: [mathcad] Re: Units Alberto, You need to type your desired units into the units box for each equation that displays a result. I have attached a modified version of your file. If you don't enter your desired units, the default units will be used. Bryce -----Original Message----- From: /> /> Sent: Tuesday, December 31, 2002 5:46 AM To: Mathcad Discussion List Subject: [mathcad] Re: Units Thank you Bryce for your help. I have tried your suggestion, but I didn't be able to solve my problem. I send you a mcad 2001i example. Alberto. (See attached file: units00-BH.mcd) --- The Mathcad List - Discussion, Support & News Contributions: /> Hosted by: Adept Scientific http://www.adeptscience.com List Archive: http://lists.adeptscience.co.uk/ --- Would you like this to come to a different email address? --- Simply leave the mailing list (see below) and re-join by sending a blank email from the new address to: or --- If you do not want to be on the Mathcad list, simply send a blank email (no subject or message needed) to: /> This communication is for use by the intended recipient and contains information that may be privileged, confidential or copyrighted under applicable law. If you are not the intended recipient, you are hereby formally notified that any use, copying or distribution of this e-mail, in whole or in part, is strictly prohibited. Please notify the sender by return e-mail and delete this e-mail from your system. Unless explicitly and conspicuously designated as "E-Contract Intended", this e-mail does not constitute a contract offer, a contract amendment, or an acceptance of a contract offer. This e-mail does not constitute a consent to the use of sender's contact information for direct marketing purposes or for transfers of data to third parties. Francais Deutsch Italiano Espanol Portugues Japanese Chinese Korean http://www.DuPont.com/corp/email_disclaimer.html
Attachments:  units00-BH.mcd

[mathcad] Re: Units
Author: Borboni    Posted: Thu, 2 Jan 2003 20:03:09 +0100
Thank you Bryce and Ted, I have used the Bryce solution and I think is quite ok for me. I agree with Ted's observations. I think the problem is that, sometimes, mathcad treats angular quantities as dimensionless. This is not only a mathcad problem; perhaps a radical solution could be introducing a new dimension, angular dimension, in the fundamental dimension system, but I think this can be done only by mathcad authors. Happy New Year, Al. ------------------------------------------------- This mail sent through IMP: http://horde.org/imp/ --- The Mathcad List - Discussion, Support & News Contributions: /> Hosted by: Adept Scientific http://www.adeptscience.com List Archive: http://lists.adeptscience.co.uk/ --- Would you like this to come to a different email address? --- Simply leave the mailing list (see below) and re-join by sending a blank email from the new address to: or --- If you do not want to be on the Mathcad list, simply send a blank email (no subject or message needed) to: />

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