fx-82MS fx-82TL fx-9860GII TI-83
ln
On a Casio calculator you can calculate natural logarithms
ln
or via the CATALOG as
CATALOG P
INPUT SHIFT 4 ln F1
Example 1
To calculate ln (1) = 0
ln 1 EXE ln 1 0
Example 2
To calculate ln (e) = 1
ex ln e1 ln SHIFT ln 1 EXE 1
Example 3
To calculate ln (e2) = 2 × ln (e) = 2 × 1 = 2
ex ln e2 ln SHIFT ln 2 EXE 2
Example 4
To calculate ln (√7) = 0.97295...
√ ln SHIFT x² 7 EXE ln √7 0.9729550745
and also ln (√7) = ½ ln (7) = 0.97295...
ln(7
1 ab/c 2 ▷ ln 7 EXE 0.9729550745
Example 5
To calculate eln (7) = 7
ex eln 7 SHIFT ln ln 7 EXE 7
and this demonstrates the definition of the logarithm.
Details
The functions ln and ex are on the same key. This makes sense because these functions all deal with the number e.