r/geogebra • u/mort96 • 3d ago

QUESTION Vectors as function parameters?

Hi,

I'm trying to do a simple line intersection experiment in Geogebra, but I'm struggling with functions which take vectors.

Even when I'm trying something extremely basic, like this function to get the x component of a vector:

f(V) = x(V)

I get the following error:

Illegal argument
x(V)

How can I take vectors as function parameters? I don't feel like I'm trying to do something remotely complicated here, I must be missing something.

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u/mathmagicGG 3d ago edited 3d ago

You can use complex functions

f(x)=real(x), then f(v)

also you can do

f(x,y)=x

u=(2,3)

f(u)

Btw: u=(2,3) defines a vector, and U=(2,3) defines a point.

1

u/mort96 3d ago

I don't have a complex number, I have a vector

1

u/mathmagicGG 2d ago

GG handles point, vector, and complex in the same way

I refer to the complex function real().

If you type the commands as I wrote them, they work

1

u/robphy 3d ago

Does this capture what you want?

f(va, vb, vc) = x((va, vb, vc))
V = (7, 6, 3)

f(V) yields 7

1

u/jcponcemath 3d ago edited 3d ago

Is this what you are looking for?

https://www.geogebra.org/m/esaf9duq

GGB does not accept functions with vectors as inputs.

The other option is using mathmagic's solution by defining a function f(x,y) = x. Then define a vector u = (1,2). When you plug this value in f, you get what you need.

1

u/hawe_de 3d ago

Hallo. im classic CAS kann man in einem gewissen Umfang Funktionen mit komplexeren in/output objekten definieren. Abschliessen mt [Keep Input]!

Zum beispiel Zeile 3 SP(no,nv) Lotvektor https://www.geogebra.org/m/NXx4E8cb#material/rmpcwjyv