(maxima.info)Functions and Variables for Affine
24.2 Functions and Variables for Affine
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-- Function: fast_linsolve ([<expr_1>, ..., <expr_m>], [<x_1>, ...,
<x_n>])
Solves the simultaneous linear equations <expr_1>, ..., <expr_m>
for the variables <x_1>, ..., <x_n>. Each <expr_i> may be an
equation or a general expression; if given as a general expression,
it is treated as an equation of the form '<expr_i> = 0'.
The return value is a list of equations of the form '[<x_1> =
<a_1>, ..., <x_n> = <a_n>]' where <a_1>, ..., <a_n> are all free of
<x_1>, ..., <x_n>.
'fast_linsolve' is faster than 'linsolve' for system of equations
which are sparse.
'load("affine")' loads this function.
-- Function: grobner_basis ([<expr_1>, ..., <expr_m>])
Returns a Groebner basis for the equations <expr_1>, ..., <expr_m>.
The function 'polysimp' can then be used to simplify other
functions relative to the equations.
grobner_basis ([3*x^2+1, y*x])$
polysimp (y^2*x + x^3*9 + 2) ==> -3*x + 2
'polysimp(f)' yields 0 if and only if <f> is in the ideal generated
by <expr_1>, ..., <expr_m>, that is, if and only if <f> is a
polynomial combination of the elements of <expr_1>, ..., <expr_m>.
'load("affine")' loads this function.
-- Function: set_up_dot_simplifications
set_up_dot_simplifications (<eqns>, <check_through_degree>)
set_up_dot_simplifications (<eqns>)
The <eqns> are polynomial equations in non commutative variables.
The value of 'current_variables' is the list of variables used for
computing degrees. The equations must be homogeneous, in order for
the procedure to terminate.
If you have checked overlapping simplifications in
'dot_simplifications' above the degree of <f>, then the following
is true: 'dotsimp (<f>)' yields 0 if and only if <f> is in the
ideal generated by the equations, i.e., if and only if <f> is a
polynomial combination of the elements of the equations.
The degree is that returned by 'nc_degree'. This in turn is
influenced by the weights of individual variables.
'load("affine")' loads this function.
-- Function: declare_weights (<x_1>, <w_1>, ..., <x_n>, <w_n>)
Assigns weights <w_1>, ..., <w_n> to <x_1>, ..., <x_n>,
respectively. These are the weights used in computing 'nc_degree'.
'load("affine")' loads this function.
-- Function: nc_degree (<p>)
Returns the degree of a noncommutative polynomial <p>. See
'declare_weights'.
'load("affine")' loads this function.
-- Function: dotsimp (<f>)
Returns 0 if and only if <f> is in the ideal generated by the
equations, i.e., if and only if <f> is a polynomial combination of
the elements of the equations.
'load("affine")' loads this function.
-- Function: fast_central_elements ([<x_1>, ..., <x_n>], <n>)
If 'set_up_dot_simplifications' has been previously done, finds the
central polynomials in the variables <x_1>, ..., <x_n> in the given
degree, <n>.
For example:
set_up_dot_simplifications ([y.x + x.y], 3);
fast_central_elements ([x, y], 2);
[y.y, x.x];
'load("affine")' loads this function.
-- Function: check_overlaps (<n>, <add_to_simps>)
Checks the overlaps thru degree <n>, making sure that you have
sufficient simplification rules in each degree, for 'dotsimp' to
work correctly. This process can be speeded up if you know before
hand what the dimension of the space of monomials is. If it is of
finite global dimension, then 'hilbert' should be used. If you
don't know the monomial dimensions, do not specify a
'rank_function'. An optional third argument 'reset', 'false' says
don't bother to query about resetting things.
'load("affine")' loads this function.
-- Function: mono ([<x_1>, ..., <x_n>], <n>)
Returns the list of independent monomials relative to the current
dot simplifications of degree <n> in the variables <x_1>, ...,
<x_n>.
'load("affine")' loads this function.
-- Function: monomial_dimensions (<n>)
Compute the Hilbert series through degree <n> for the current
algebra.
'load("affine")' loads this function.
-- Function: extract_linear_equations ([<p_1>, ..., <p_n>], [<m_1>,
..., <m_n>])
Makes a list of the coefficients of the noncommutative polynomials
<p_1>, ..., <p_n> of the noncommutative monomials <m_1>, ...,
<m_n>. The coefficients should be scalars. Use
'list_nc_monomials' to build the list of monomials.
'load("affine")' loads this function.
-- Function: list_nc_monomials
list_nc_monomials ([<p_1>, ..., <p_n>])
list_nc_monomials (<p>)
Returns a list of the non commutative monomials occurring in a
polynomial <p> or a list of polynomials <p_1>, ..., <p_n>.
'load("affine")' loads this function.
-- Option variable: all_dotsimp_denoms
Default value: 'false'
When 'all_dotsimp_denoms' is a list, the denominators encountered
by 'dotsimp' are appended to the list. 'all_dotsimp_denoms' may be
initialized to an empty list '[]' before calling 'dotsimp'.
By default, denominators are not collected by 'dotsimp'.
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