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RE: [MATHCAD] V 8.03 are there bugs? or do I just need help?

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RE: [MATHCAD] V 8.03 are there bugs? or do I just need help?
Author: Dave Powley    Posted: Fri, 1 Oct 1999 10:45:07 +0100
The expression simplifies "correctly" in version 7 Pro if you use simplify,assume=RealRange(0,infinity). i.e. the variables are all positive real. Interesting that the earlier version 5 apparently finds the "correct" answer without this. I hadn't realised that this was happening (OK, I should have) - maybe it explains why some expressions I thought should simplify apparently didn't. Dave Powley > Second, I tried symbolically simplifying > ((a^(-1)*b^3)/(a*b))^(-1/2)*((a*b^(-1))/(a^4*b^2))^(1/3). Can someone verify > if it's my mistake and Mathcad does simplify to 1/b^2 (Please send me your > file if Mathcad provides you the correct simplification). ----------------------------------------------------------------------- This email and any files transmitted with it are confidential and intended for the exclusive use of the addressee only. If you are not the intended recipient, you should not use the contents nor disclose them to any other person and you should immediately notify the sender and delete the email. The statements and opinions expressed here may not represent those of the company. The parent company of the Renishaw Group is Renishaw plc, registered in England no. 1106260. Registered office: New Mills, Wotton-under-Edge, Gloucestershire, GL12 8JR, United Kingdom -----------------------------------------------------------------------

RE: [MATHCAD] V 8.03 are there bugs? or do I just need help?
Author: Ray Girvan    Posted: Fri, 1 Oct 1999 13:37:03 +0100
Dave Powley writes: > The expression simplifies "correctly" in version 7 Pro if you use > simplify,assume=RealRange(0,infinity). i.e. the variables are all > positive real. Ah! It works in v8 Pro too. I'm slow this morning; I was trying to do it by applying "assume" only to the variables. Having re-read p284, I've just twigged the crucial point that your above form makes all "indeterminates" positive real - not just variables. Otherwise the simplification can't go any further with expressions like SQRT(b^2/a^2). > Interesting that the earlier version 5 apparently finds the > "correct" answer without this. I can't remember where v5 was regarding handling of complex numbers. Presumably it just assumed all indeterminates were real? Ray -- +++ Technical Author +++ Topsham, Devon, UK http://www.users.zetnet.co.uk/rgirvan/ +++ The Apothecary's Drawer ------------------------------------------------------------- The Mathcad List - Discussion, Support & News Contributions: /> To unsubscribe: Send in the body: unsubscribe mathcad To: /> Hosted by: Adept Scientific http://www.adeptscience.com List Archive: http://lists.adeptscience.co.uk/

RE: [MATHCAD] Ray -- V 8.03 are there bugs? or do I just need help?
Author: William Hoffman    Posted: Fri, 1 Oct 1999 17:26:35 -0700
Ray, Would your MathCAD file show the tweaking necessary to achieve what I am looking for with version 8? William -----Original Message----- From: /> Behalf Of Ray Girvan Sent: Friday, October 01, 1999 5:37 AM To: /> Subject: RE: [MATHCAD] V 8.03 are there bugs? or do I just need help? Dave Powley writes: > The expression simplifies "correctly" in version 7 Pro if you use > simplify,assume=RealRange(0,infinity). i.e. the variables are all > positive real. Ah! It works in v8 Pro too. I'm slow this morning; I was trying to do it by applying "assume" only to the variables. Having re-read p284, I've just twigged the crucial point that your above form makes all "indeterminates" positive real - not just variables. Otherwise the simplification can't go any further with expressions like SQRT(b^2/a^2). > Interesting that the earlier version 5 apparently finds the > "correct" answer without this. I can't remember where v5 was regarding handling of complex numbers. Presumably it just assumed all indeterminates were real? Ray -- +++ Technical Author +++ Topsham, Devon, UK http://www.users.zetnet.co.uk/rgirvan/ +++ The Apothecary's Drawer ------------------------------------------------------------- The Mathcad List - Discussion, Support & News Contributions: /> To unsubscribe: Send in the body: unsubscribe mathcad To: /> Hosted by: Adept Scientific http://www.adeptscience.com List Archive: http://lists.adeptscience.co.uk/ ------------------------------------------------------------- The Mathcad List - Discussion, Support & News Contributions: /> To unsubscribe: Send in the body: unsubscribe mathcad To: /> Hosted by: Adept Scientific http://www.adeptscience.com List Archive: http://lists.adeptscience.co.uk/

RE: [MATHCAD] Ray -- V 8.03 are there bugs? or do I just need help?
Author: Ray Girvan    Posted: Sat, 2 Oct 1999 01:06:02 +0100
William Hoffman writes: > Ray, > Would your MathCAD file show the tweaking necessary to > achieve what I am looking for with version 8? Sure; rather than bother everyone with the attachment, I'll send you a copy directly. Ray -- +++ Technical Author +++ Topsham, Devon, UK http://www.users.zetnet.co.uk/rgirvan/ +++ The Apothecary's Drawer ------------------------------------------------------------- The Mathcad List - Discussion, Support & News Contributions: /> To unsubscribe: Send in the body: unsubscribe mathcad To: /> Hosted by: Adept Scientific http://www.adeptscience.com List Archive: http://lists.adeptscience.co.uk/

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