Factorio Productivity Modules and Speed Beacons.sm (9kb) downloaded 23 time(s).
I made a curve sketching with the equations on paper. Now I hoped to do it in SMath too, to make it easier an prettier. But I'm having problems all a round.

Write both functions: worked.

Insert one into the other to obtain two functions with only one var: worked manually.

Build the diff of both functions: worked, but the result is very complicated.
My results:
f'(c)=1-3a/c^2
f'(r)=3-a/r^3

Set the diffs=0 and obtain the extrema (positive only): no clue.
My results:
c=sqrt(3a)
r=sqrt(a/3)

Check them with the second derivative, if they are truly a minimum point: last results already missing.
My results:
Both are minima.

Get the relation of c/r...
My results:
c/r=3/1

But how do I get all of that at least semi-automatically in SMath?

Here's something I put together. You'll need the Maxima plugin to run it. SMaths built in symbolic engine is lacking and therefore it's generally better to use Maxima or maple plugins when solving symbolically.

Factorio_Productivity_Modules_and_Speed_Beacons_alyles.sm (25kb) downloaded 23 time(s). Factoria_Productivity_Modules_and_Speed_Beacons_alyles.pdf (328kb) downloaded 18 time(s).

Let's try something simple. Solve a triangle side length with Pythagoras. I want to know how long the longest side p is. The other sides are h and 1,5b long. So the formula goes p^2=... How do I get SMath to solve it for p, do I already need Maxima for that?
Pythagoras.sm (7kb) downloaded 14 time(s).

The maxima plugin is 160mb, when SMath is less than 3mb?!

Or calculating an angle in a right-angled triangle: Angle.sm (3kb) downloaded 12 time(s).
Can't solve that too! Also Maxima needed?

Edited by user 04 March 2020 01:17:14(UTC)  | Reason: Not specified

WHAT? I have no idea what that means.


The old versions are free? So use them instead of SMath?


That's not what I had in mind. Why do you clear h and b? Those were given for a reason (easy example). I just wanted to know a way, where SMath inserts the values from h and b in the "p^2=..."-formula and solves it for p (the greyed out block is the expected result, when I type "p=" below h=3 b=5 and p^2=..., but all the different equal sign and evaluate symbolically aren't working as I'd like them to).

https://web2.0calc.com/ is nearly enough (for now?) math wise: integrals, diff, solving functions...
I can go there paste "h=3 b=5 p^2=h^2+(1.5*^2" and it's solved (p=...) I just want a more permanent way, like the SMath or excel save files.
But in SMath no idea, even your example didn't help sadly.
You already transformed the formula to sqrt() yourself. Why did you clear the h and b? The section with sinus and alpha also doesn't calculate itself.

I specify sin(alpha)=... and I hope when I type "alpha=", it does what you did automatically, it will evaluate the last formula, realize D isn't needed anyway, reduce the fraction and calculate the asin(1/2) to get alpha. The webcalc fails with "sin(a)=(3/2D)/3D" too, but "sin(a)=(3/2)/3" works at least.

Exemplos simples

Pythagoras_R1.sm (22kb) downloaded 21 time(s).

Best Regards

Carlos

... more maths for your Pythagora [Area, Perimeter].

Maths Polygon Edu.sm (48kb) downloaded 13 time(s).
Maths Polygon Area_Perimeter.sm (56kb) downloaded 11 time(s).
Maths Polygon.sm (861kb) downloaded 13 time(s).

The Maxima plugin is 1.4mb and requires a standard installation of Maxima, which is another 660mb. Ideally, we would have an integrated maxima stripped down to the bare functionality, without front end, doc, source, packages. Yet, the maxima guys are very picky about license issues, therefore I don't distribute Maxima any more bundled with SMath.

If you don't care about legal issues, you can use the maple plugin, it uses a maple executable of just some mb without authorization.

Recently, there have been efforts to enhance the symbolic capabilities with native SMath tools, including some sort of solve function.

Perhaps symbolic solvers are overkill for your problem anyways, as the FindRoot() function from the Nonlinear solvers plugin can handle the example as well.

Pythagoras_Kr.sm (12kb) downloaded 14 time(s).