Finding local max, min, and saddle points

[engenheiro civil]

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Define ext()=
Prgm
Local fx,fy,fxx,fyy,f1,po,x,y
Disp "Finding local max, min, and saddle points"
Request "Type function",f1
fx:=d/dx(f1,x)
fy:=d/dy(f1,y)


Now how can I do

Code: Select all

solve(system(f1=0,f2=0),{x,y}) and put in a two distinct variables


Would be with a matrices or a list?
And how to do?
Im not finish but I am not knowing where to go from here

TY for any help…

Code: Select all

Disp x
Disp y
Disp "Partial in terms of X : ",fx
Disp "Partial in terms of Y: ",fy
EndPrgm


[critor]

Try nsolve instead of solve for example.

It doesn't return an expression but a list.

[Bisam]

You can also use "expr>list" which takes an answer from "solve" and converts it to a list of all the possible solutions (the "list" being a matrix if the "solve" was on multiple variables).