index and find cmd

[compsystems]

The functions that I expose if they are important, please verify in link, http://www.hpmuseum.org/forum/thread-8577-page-3.html

For example, it is necessary to detect specific data types, for this the funtion subtype() cmd is required


Xcas
subtype(set[a,a,b]),subtype(poly1[0,0,3,-1]),subtype(a,a,b) [↵] returns
2,10,1


Other function type commands to incorporate: equal2diff, list2exp

Sample
c:=circle(0,2);
b:=4x^2+3x*y+y^2-8;
a:=equal2diff(equation(c));
r:=resultant(a,b,x);
sy:=solve(r=0,y,'='); sx:=sy:;
list2exp(sy,y); [↵] returns

y=(-(sqrt((sqrt(17)+7)/3) or y=(-(sqrt((-(sqrt(17))+7)/3) or y=(sqrt((-(sqrt(17))+7)/3) or (y=(sqrt((sqrt(17)+7)/3)

Test on-line, press session Xcas sublink
https://xcas.univ-grenoble-alpes.fr/foru...28&p=10708