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ChangeLog-5.20    128 lines (98 with data), 4.5 kB

   Maxima 5.20 change log
   Compiled 2009-12-13
   Thanks to Dieter Kaiser for most of this text


   Backwards-incompatible changes:

 * removed package jtroot3 (superseded by bfallroots)

 * internal symbols of specint replaced by more descriptive names:

    %f         --> hypergeometric
    %e         --> elliptic_ec
    %kelliptic --> elliptic_kc
    %p[a,b,c]  --> jacobi_p
    %p[a,b]    --> assoc_legendre_p
    %p[a]      --> legendre_p
    %q[a,b]    --> assoc_legendre_q
    %q[a]      --> legendre_q
    hstruve    --> struve_h
    lstruve    --> struve_l
    %d         --> parabolic_cylinder_d
    %m         --> whittaker_m
    %w         --> whittaker_w
    %ei        --> expintegral_ei
    %h[n,x]    --> hankel_1 and hankel_2
    %he        --> hermite


   New items in core:

 * general mechanism for functions to distribute over operators
   (distribute_over declaration)


   Other revisions:

 * improved Laplace transforms of special functions

 * assume database:

   The inferences between the declarations of variables as integer,
   real, complex, .. have been cut out. The constant %i is declared
   to be imaginary. The constants %pi, %e, %gamma, %phi are declared
   to be real.
  
   The database handles expressions with constants more completely.
   Facts like assume(x < %pi/2) are now handled correctly.
  
   The sign of sums of constant expressions is determined more
   correctly.
  
   Askinteger take into account more facts from the database.

 * improvements of special functions:

   More functionality for the Hankel 1 and 2 functions:
   Expansion for a half integral order has been implemented.

   More consistent numerical evaluation of Bessel and Hankel functions.

   More general integrals for Bessel functions and implementation of
   integrals for the Airy functions.

   Gamma function accepts a Taylor expansion as an argument.

   Implementation of Struve H and L functions:
   Numerical evaluation for real and complex numbers in float and
   bigfloat precision. Handling of specific values. Derivatives of the
   functions and expansion for a half integral order is implemented.

   Adding mirror symmetry for the Airy functions.

   Improving the limits of the log and factorial functions.

 * package fft: revised for greater speed
 * package to_poly_solver: improvements
 * regularize error and warning messages, and translate via gettext (ongoing)
 * bug fixes and other improvements in plotting code
 * bug fixes in translator


   Bug fixes:

   2906049: integration failure with option integrate_use_rootsof :true
   2901855: limit(sqrt(x),x,minf) not fully evaluated
   2886564: conjugate(atan2(y,x)) not simplified
   2882408: solve_rat_ineq returns false answers
   2876387: ode2 asks if sqrt(3) is an integer
   2876284: nicedummies of subscripted
   2876277: hgfred([3/2,-2],[5/2],-x) not fully simplified
   2873057: incorrect version is reported in manual front page
   2872605: abs_integrate bug
   2872505: Assume database inconsistent after reset()
   2847387: hgfred([3/2,-b],[5/2],-1) bogus
   2843705: limit of psi[i]
   2842198: next_prime speed improvement
   2842060: unsimplified result from integrate
   2841504: Limit of the factorial function - 4 problems
   2840566: defint fails to determine if one of its limit is real
   2836339: unsimplified negation
   2835634: logcontract broken
   2835098: SIGN-PREP strangeness
   2834336: ratsimp vs facsum
   2824360: missing bug reporting node in manual's detailed menu
   2808568: Reserved words that aren't reserved
   2802006: integrate(1/(sqrt(x)+1), x, 0, 1);
   2770575: rtestsum test 226
   2636628: solve_rat_ineq doesnt find all soloutions
   2609426: integrate(cos(a)/sqrt((tan(a))^2+1), a,-%pi/2,%pi/2);
   2148461: docs for factor refer to "the field of integers"
   2018842: unsimplified result from jacobi_p
   1977146: radexpand does not work as explained in documentation
   1725951: unsimplified boolean
   1646397: listofvars includes true
   1551310: mod and floor should distribute over matrix and list
   1038624: askinteger ignores asksign database
    840360: qunit(4) internal errors
    831163: part(x) should give warning
    816797: limit(%i*log(a),a,0) nounform (%i*und problem)
    788892: zeroa handled inconsistently
    752067: Can't untrace ?meval
    706455: Should powerseries do Laurent expansions?
    652470: Pickapart error (due to MEMSIMILAR)
    640332: Need to specdisrep more systematically
    627759: Ratdisrep of aggregates