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.

Wrote

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 !

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.

Wrote

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 (34,57 KiB) scaricato 1146 volta(e).

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

Thank you, [USERLINK]PDG[/USERLINK].

Bug confirmed. Will look at it later.

I thank you Andrey.
I use SMath almost 10 years now.
Univ., Research, PhD, now at side projects.

Great tool. Great work.

Wrote

I am just reporting what I notice.

That one, X_Y refuses plotting at all !

Wrote

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 (76,77 KiB) scaricato 1142 volta(e).

Wrote

transit algorithm

... this is another style of parametric solution.

ODE_Laplace 1rst [Type 1].sm (24,7 KiB) scaricato 1161 volta(e).

Wrote

... 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 (28,22 KiB) scaricato 1370 volta(e).