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PDG		#1 Posted : 16 June 2018 21:43:24(UTC)
Rank: Member Groups: Registered Joined: 02/12/2017(UTC) Posts: 12 Was thanked: 4 time(s) in 3 post(s)		I found small bug in Differential Equations Display. Simple example: Calculations are done. But symbolic evaluation do not show the outcome. The problem is not catastrophic. But I thought it worth it to report it.
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Jean Giraud		#2 Posted : 17 June 2018 03:59:33(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		Originally Posted by: PDG Calculations are done. But symbolic evaluation do not show the outcome. The problem is not catastrophic. But I thought it worth it to report it. Confirmed: no bug ... your screen is lazy to expand ... if that what you have !
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PDG		#3 Posted : 17 June 2018 12:58:08(UTC)
Rank: Member Groups: Registered Joined: 02/12/2017(UTC) Posts: 12 Was thanked: 4 time(s) in 3 post(s)		Jean, you misunderstood the "problem". Not the calculation is wrong. This is: As I wrote, it is not big and not a kind it is impossible to live with it. I am just reporting what I notice.
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Jean Giraud		#4 Posted : 17 June 2018 16:32:25(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		Originally Posted by: PDG As I wrote, it is not big and not a kind it is impossible to live with it. I am just reporting what I notice. There is no use to evaluate the Mathcad style. On the other hand, many direct expansion Mathcad style can't be copied for export. Thus, the best is the algorithmic construction. On that point, Smath is fully competent ... look @ the "Colibri" attached. Jean Spline De Boor [Colibri].sm (35kb) downloaded 15 time(s).
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Jean Giraud		#5 Posted : 18 June 2018 00:31:04(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		There are few more curiosities in Smath. In Smath, erf(x) is not a scalar function in the maths sense, Build the example and if you get the two red ones, "X-not defined" that you must read "erf(x) is not scalar" ... Thus: 1. vectorize the integrand 2. Pre-assign the X_Y plot Example from version 6179
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Andrey Ivashov		#6 Posted : 18 June 2018 00:53:50(UTC)
Rank: Administration Groups: Developers, Registered, Knovel Developers, Administrators, Advanced Member Joined: 11/07/2008(UTC) Posts: 1,616 Was thanked: 1978 time(s) in 666 post(s)		Thank you, PDG . Bug confirmed. Will look at it later.
		WWW
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PDG		#7 Posted : 18 June 2018 01:08:08(UTC)
Rank: Member Groups: Registered Joined: 02/12/2017(UTC) Posts: 12 Was thanked: 4 time(s) in 3 post(s)		I thank you Andrey. I use SMath almost 10 years now. Univ., Research, PhD, now at side projects. Great tool. Great work.
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Jean Giraud		#8 Posted : 18 June 2018 02:31:41(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		Originally Posted by: PDG I am just reporting what I notice. That one, X_Y refuses plotting at all !
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Jean Giraud		#9 Posted : 18 June 2018 05:23:28(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		Originally Posted by: PDG Jean, you misunderstood the "problem". I accept, but in turn you must accept the fundamental concept of transit algorithm in integration/derivation. Good thing it is this way, otherwise lot more advanced maths could not be done or would issue errors messages of all kinds. ... light red page 4. Jean Maths_0 Transit [The concept].sm (77kb) downloaded 12 time(s).
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Jean Giraud		#10 Posted : 18 June 2018 05:53:48(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		Originally Posted by: Jean Giraud transit algorithm ... this is another style of parametric solution. ODE_Laplace 1rst [Type 1].sm (25kb) downloaded 13 time(s).
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Jean Giraud		#11 Posted : 18 June 2018 06:32:23(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		Originally Posted by: Jean Giraud ... this is another style of parametric solution. ... a much different style of transit. At that times my brain diluted on that one ! Takes quite a while before "t_not defined" Jean Integrate Voltera IntEQUATION.sm (29kb) downloaded 18 time(s).
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