Adjoint matrix (my function): ok with numbers but not symbolics

[salvomic]

(11-10-2017 06:55 PM)parisse Wrote:  When you compute the det of a minor, it will return a symbolic expression, can you really store that in a Home local variable?

you are right, I didn't think it when I wrote the program.

Quote:Why don't you write a CAS program ?
What about defining adj(m):=adjoint_matrix(m)[2,size(m)]?

oh, well (it is not a bug, Tim)
In 2015 we hadn't adjoint_matrix()...

Thank you! Now is more and more simple. I'm rewriting the program as you suggest.
Only a little difference: adjoint_matrix([[1,2],[4,3]])[2,2] returns [[-3,2],[4,-1]] and my adj([[1,2],[4,3]]) returns [[3,-2],[-4,1]], that's the first result multiplied by -1 ...
Also with [[a,b],[c,d]] I get the difference * -1...