Getting started with KAlgebra/da

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Kalgebra er et regneprogram med symbolske og analytiske faciliteter, som både lader dig tegne grafer og 3D-plots og arbejde med matematiske udtryk.

Fanebladet Konsol

Lige når du starter KAlgebra, så ser du et tomt vindue; det er hovedsaligt her du arbejder med beregninger.

Lad os komme i gang med et lille eksempel på, hvordan KAlgebra virker. Skriv

2+2

og tast så Enter. Kalgebra viser dig så resultatet. Det var nemt nok.

However, KAlgebra is much more powerful than that. It started as a simple calculator, but now it's almost a CAS.

You can define variables this way:

k:=3

And use them normally:

k*4

And that will give you the result:

You can also define functions:

f:=x->x^2

And then use them:

f(3)

Which should return

9.

You can define a function with as many variables as you want:

g:=(x,y)->x*y

The possibilities of defining functions are endless if you combine this with the piecewise function. Let's define the factor function:

fact:=n->piecewise { n=0 ? 1, n=1 ? 1, ? n*fact(n-1) }

Yes! KAlgebra supports recursive functions. Give some values to n, to test it.

fact(5)
fact(3)

KAlgebra has recently started support for symbolic operations, to check it out, just type:

x+x+x+x

or

x*x

It doesn't work on some complex structures, though. Only basic support so far.

Moreover, KAlgebra has support for differentiation. An example of the syntax:

diff(x^2:x)

If you have used KAlgebra, you will have noticed the syntax completion support, which is very helpful.

Another resource that can be useful to learn more about KAlgebra comes with KAlgebra: The Dictionary tab

It contains examples of every function supported by KAlgebra. Maybe this is the best way to learn how to do things with KAlgebra.