So I was just making a piece for fun, with the idea that I'd build a grid by selecting for each integer pair a random quarter of the circle with radius 1 or edge of a square of width 1. I built an 8 member list, then tried to make a command like
Sequence(Sequence(Translate(RandomElement(l1), (i, j)), i, 1, n), j, 1, n)
It would only select a variety of segments or arcs but never a mix. About half undefined elements. Hmm. So I tried building an nxn matrix of RandomBetween(1,8) and selecting
Sequence(Sequence(Translate(Element(l1, Element(m4, i, j)), (i, j)), i, 1, n), j, 1, n)
with the same result. So I made a list of lists {{arc1, arc2, ...},{seg1,seg2,...}} and
Sequence(Sequence(Translate(RandomElement(RandomElement(l1)), (i, j)), i, 1, n), j, 1, n)
and got the same result.
It doesn't matter because this was just for fun, but can anyone help me understand what's going on?
ps: when I tried translating the whole list to each (i,j) it worked.
The same question 
It's not a problem of random. It's a problem of addressing the 2 dimensional list.
====================================================
l3 = {{<conic>,....<conic>}, {<segment>, ......<segment>}}
is a 2 dimensional list
.
for circles:
Sequence(Sequence(Translate(RandomElement(Element(l3, 1)), (i, j)), i, 1, n), j, 1, n)
.
for segments
Sequence(Sequence(Translate(RandomElement(Element(l3, 2)), (i, j)), i, 1, n), j, 1, n)
.
Note: circles and segments must be in separated Sequence() because a Sequence() [and also Zip()] can have only 1 object-type as output.
I tried them all in one dimensional list to no avail as a first try. And even as a 2D list, why wouldn't RandomElement(RandomElement(l3)) work to make a mix?
Note my note above.
"RandomElement(RandomElement(l3))" broke the rule in the note.
Not all is documented in GGB; but sure nothing what GGB does when a rule is broken.
I guess that at the time of precompiling (open file?) ggb decides which object type is to apply.
.
Open the attached file (test-version 0) 10 times: after opening one (1) random object type appears, but after each update-construction always the same as before. Also notice the "?" in the generated list l4. I think these are the random elements that broken the rule in my note above.
https://wiki.geogebra.org/e...
So why didn't the random number 1-8 matrix approach work? Do lists have to be all the same type always?
yo creo que lo más simple es crear tres listas: lista de arcos, lista de segmentos, lista de booleanos
entonces se eligen aleatoriamente un arco, un segmento y un booleano para cada punto y se muestra el arco o el segmento segun el valor del booleano
he intentado el truco de Michael y he encontrado un bug en la traslacion de circumcirculararc() definidos a partir de puntos especificados mediante coordenadas dentro de la instruccion
si los puntos dentro del parentesis se especifican mediante coordenadas y no como nombres de puntos la traslacion no es correcta
Fun thread to read - really cool result!
I used parametrics to have your set be all one object type :
https://www.geogebra.org/m/pxu3ddqj
fun is the favorite of mathematicians
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