The following is a rough guide to linear algebra operations
in the TI-85. Use this to find and familiarize yourself with
the corresponding operations in your own calculator. If necessary,
I can help you with this during office hours- but ordinarily I will
not use calculators in class.
MATRICES are entered by row vectors, with no commas between rows.
MENU ADDRESS FUNCTION
matrix/names names of existing matrices
matrix/edit change matrix entries, insert/delete columns or rows
/LU LU(A,L,U,P) given A, computes L,U and P in LU=PA (p.477)
matrix/ops/ident ident 2 = 2X2 identity matrix
aug(A,B) (resp. aug (A,v)) augments the matrix A by the matrix B
(resp. by the vector v).
/ref ref A returns the row echelon form of A
/rref rref A returns the reduced row-echelon form of A
VECTORS are entered as row vectors, treated as column vectors when acted upon by matrices.
vector/names names of existing vectors
vector/edit change entries
vector/math/cross cross(v,w) returns the cross-product of v and w
/norm norm v = norm of v
/dot dot(v,w)= dot product of v and w
vector/ops/>pol >pol [x,y] returns [x,y] in polar coords(similar for spherical)
the key MODE allow one to express angles in degrees (rather than radians), etc.
the operation "simult", which may be found with the key "CATALOG", solves linear systems
simult(A,v) returns the solution x to Ax=v
(only nonsingular A accepted!)