[Maxima-discuss] Maxima does not define hstep

[Thomas D. D. <to...@wa...>]

Maxima branch_5_47_base_1500_g32a79c344 https://maxima.sourceforge.io
using Lisp GNU Common Lisp (GCL) GCL 2.6.14 git tag Version_2_6_14
Distributed under the GNU Public License. See the file COPYING.
Dedicated to the memory of William Schelter.
The function bug_report() provides bug reporting information.
(%i1) ??hstep


  -- Function: hstep (<x>)
      The Heaviside unit step function, equal to 0 if <x> is negative,
      equal to 1 if <x> is positive and equal to 1/2 if <x> is equal to
      zero.

      If you want a unit step function that takes on the value of 0 at
      <x> equal to zero, use 'unit_step'.

(%o1)                                true
(%i2) hstep(x);
file_search1: pwilt not found in file_search_maxima,file_search_lisp.
  -- an error. To debug this try: debugmode(true);

(%i3) hstep(x):= if x<0 then 0
elseif x<1 then 1
else 0;
define: warning: redefining the built-in function hstep
(%o3)       hstep(x) := if x < 0 then 0 elseif x < 1 then 1 else 0
(%i4)

Tom Dean