The problem with command If

OK,

I understand, thanks you for the replies

@Mathmagik

You replaced polyline with linear functions-a useful tool! thanks

A am interested her possibility to include in the "If" these two different objects!...

very nice mathmagic.

@Roman

Can you specify your question or the properties of your polyline or your if-command?

If your polyline is a piecewise given function (you can use mathmagic's tool to get it) then you have, as the name sayed, two functions and the if-command should work, because they are of the same type (functions).

But if your polyline is not a function more details or informations may help to find a solution.

Kind regards

mire2

@mire

On a certain interval, depending on the conditions, it is required to specify various piecewise function. I often use the Polyline command. But it is not a function-list of segments!

The Intersect command finds the intersection points of Polyline and Functions! I thought that the If command works with them too... The suggested Mathmagic tool is also convenient as a Polyline command!

@Mathmagic

In the inequality F:...

If (x (Element (m, k)) ≤ x ≤ x (Element (m, k + 1)) must be ->

If (x (Element (m, k)) ≤ x <x (Element ( m, k + 1)),

otherwise at the joints points the function is added twice .

if(3<=x<=4,x,4<=x<=5,x+3) is equal to if(3<=x<=4,x,4<x<=5,x+3) but different to if(3<=x<4,x,4<=x<=5,x+3)

more if(3<=x<=4,x,4<=x<=5,x+3) is equal to if(3<=x<=4,x,3<=x<=5,x+3)

type the three functions and try f(4),g(4),(h(4))

you can change the tool if you like

@Mathmagic

my example in the attached file

excuse. I though I had made a nested if function. So you must to edit the tool.

the single strange points of tool1(list) are not visible, this confused me

Thank you very much for the work you are doing! I think that such a tool can be among the Geogebra commands!!!

I forgot it. really the command was in GG. see datafunction(). but it is not dynamic

it needs an update script

!!!!!!!!!!!!! super, but is not dynamic to use......

rami did something similar:

GGb-Formum - German - Funktion durch mehrere Punkte [Dreiecksfunktion]