Casio Reckon User Manual page 3

i, √ −1, is mapped to SHIFT 0 (labelled i). Note, currently complex i and lower-case i are the same
character. This might change.
VARS is used by reckon for unit conversions (see section). For convenience VARS enters the # symbol and
automatically engages alpha lock.
When operating in RPN, differences apply to number entry. The pre-minus (-) key acts to change the sign of
the mantissa and then of the exponent after EXP is used.
single term within RPN mode. For example entering the formula, 2����
Additionally, RPN mode supports free-form entry. This allows algebraic style syntax to be used to enter a
building the expression from RPN parts. Free form entry in RPN is initiated by the keys (, [ or single quote
(SHIFT COMMA).
Once initiated, the reminder of the current input works as if in ALG mode, until EXE or AC is hit.
Furthermore, DEL works the same as ALG mode and there is no immediate input syntax checking.
Opening parentheses in RPN is useful, when you want to enter a subexpression that you wish to evaluate
on EXE. The following example in RPN makes use of an ALG subexpression.
2 EXE 3 + ( 2 + 3 EXE –
Note that the free-form initiator key must be used at the start of expected RPN input. Square bracket is
used as a free-form initiator to allow easy entry of vectors and matrices in RPN. e.g.
[ 2,3 EXE EXE +
Additionally single quote ' is accepted as a free-form initiator. This is the quote operator and acts to prevent
evaluation. It is useful for entering the name of a variable when that variable is already bound. e.g. as an
expression or as argument to Purge().
You can use quote with expressions involving numbers, but they will not be evaluated. e.g.
> '1+2
1+2
Using quote is handy for Plot() in RPN. e.g.
' SIN X EXE 0 EXE 2π PLOT
This gives an alternative to the usual RPN way, X SIN 0 EXE 2π PLOT
All trig operations work in radians, there is no DEG/RAD/GRAD mode. So, sin(90) finds the sine of 90
ALPHA ^ labelled θ). e.g. sin(90°) will result in sin 90 ����������������������������.
radians. If you want to enter an angular quantity, postfix the value with the degree symbol, °, (bound to
radians. So sin(90.3045°) calculates sin 90°30"45 ����������������������������.
Note: the deg symbol applies DMS, in the format DDD.MMSS to degrees, and then converts degrees to
To go the other way say, for example, from arcsine back to DMS, use the angle operator (SHIFT XθT
labelled ∠. e.g. Asin(1)∠ is 90. Again the result is transformed from radians to degrees and then to DMS
with the format DDD.MMSS. The same applies in RPN mode, except you will see the conversions happening
immediately you press the conversion operations.
Other keys not used (currently):
EXIT, QUIT, CAPTURE, PASTE, PGRM, CATALOG, LIST, CR (SHIFT EXE). SETUP, F1, F2, F3, F6
Variables
Variable names can be more than one letter. Variables must start with a letter and thereafter
alphanumeric. So XX is not X*X, but a different variable.
− ���� + 1 is easier as written than
2 4