Calc
uses recursion in many of its calculations. Emacs Lisp keeps a
variable max-lisp-eval-depth which limits the amount
of recursion possible in an attempt to recover from program bugs.
If a calculation ever halts incorrectly with the message
“Computation got stuck or ran too long,” use the
M command (calc-more-recursion-depth) to
increase this limit. (Of course, this will not help if the
calculation really did get stuck due to some problem inside
Calc.)
The limit is always increased (multiplied) by a factor of two.
There is also an I M
(calc-less-recursion-depth) command which decreases
this limit by a factor of two, down to a minimum value of 200.
The default value is 1000.
These commands also double or halve
max-specpdl-size, another internal Lisp recursion
limit. The minimum value for this limit is 600.