HP 12C "Solve LOG from TVM funtions"

10172017, 08:31 AM
(This post was last modified: 10182017 12:46 AM by Gamo.)
Post: #1




HP 12C "Solve LOG from TVM funtions"
LOGARITHMS FOR ANY BASE
The following keystrokes solve for the exponent c in the equation A^c = B when A and B are known. This procedure may be labeled "finding the logarithm of B to the base A". The natural logarithm of B will again be available in the y register Keystrokes: 1. A ENTER 1  100 x [i] 1 [PV] B [FV] [N] > c 2. [X<>Y] > ln B (base e) "this only work on HP80" Example: Find the exponent c in the equation: 16^c = 4096 1. 16 ENTER 1  100 x [i] 1 [PV] 4096 [FV] [N] > answer 3.00 (log 4096, base 16) 2. [X<>Y] > answer 8.32 (ln 4096, base e) 

10172017, 12:10 PM
Post: #2




RE: HP 12C "Solve LOG from TVM funtions"
Wouldn't this be simpler?
B [LN] A [LN] [÷] Example: Find the exponent c in the equation: 16^c = 4096 4096 [LN] 16 [LN] [÷] > answer 3.00 (log 4096, base 16) X<> c Joe 

10172017, 02:43 PM
Post: #3




RE: HP 12C "Solve LOG from TVM funtions"
Thank You Joe
I just wanna show that this can be done with TVM functions. Your procedures is much simpler too. Gamo 

10222017, 09:21 PM
Post: #4




RE: HP 12C "Solve LOG from TVM funtions"
Joe's right.
However, because the first two HP Financial calculators do not have the LN function, HP did provide a way to compute LOG & LN using the financial keys on the HP80, and LOG on the HP70. Since the HP80 does all its computations in the stack, if you follow HP's instructions to get a LOG, the LN is automatically left in the Y register. HP70, like all that follow, uses dedicated financial registers, so the Y reg will not contain LN, but there still is a way to compete LN on it if one puts the right input into the Interest (i) register. Regards, Bob 

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