calc: Error Messages
4.9 Error Messages
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Many situations that would produce an error message in other calculators
simply create unsimplified formulas in the Emacs Calculator. For
example, ‘1 <RET> 0 /’ pushes the formula ‘1 / 0’; ‘0 L’ pushes the
formula ‘ln(0)’. Floating-point overflow and underflow are also reasons
for this to happen.
When a function call must be left in symbolic form, Calc usually
produces a message explaining why. Messages that are probably
surprising or indicative of user errors are displayed automatically.
Other messages are simply kept in Calc’s memory and are displayed only
if you type ‘w’ (‘calc-why’). You can also press ‘w’ if the same
computation results in several messages. (The first message will end
with ‘[w=more]’ in this case.)
The ‘d w’ (‘calc-auto-why’) command controls when error messages are
displayed automatically. (Calc effectively presses ‘w’ for you after
your computation finishes.) By default, this occurs only for
“important” messages. The other possible modes are to report _all_
messages automatically, or to report none automatically (so that you
must always press ‘w’ yourself to see the messages).
Info Catalog
calc: Undo
calc: Introduction
calc: Multiple Calculators