Question about Texas Instruments TI-84 Plus Calculator

# Log base key has been disabled - Texas Instruments TI-84 Plus Calculator

Posted by Anonymous on

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Posted on Jan 02, 2017

If you have the latest version of the firmware (2.53) you can use the logBASE function available in the CATALOG. If you don't have the latest firmware, you can get it from http://education.ti.com

Regardless of the firmware version, you can always compute the logarithm to any base by using the relationship

logb(x) = log(x)/log(b) = ln(x)/ln(b)

Posted on May 02, 2010

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## Related Questions:

### Log 3 base 10

Press LOG 3 ENTER.

The LOG key on the keyboard gives you base-10 (common) logs while the LN key gives you base-e (natural) logs. If you want the log to another base you can use the logBASE function found in the catalog.

Apr 07, 2014 | Texas Instruments TI-84 Plus Calculator

### Change base log

http://education.ti.com/guidebooks/scientific/30xii/teacher_guide/30xiitg-eng_.pdf page 108 may shed light on this. This may not be your exact model but the keys work the same.

Nov 29, 2013 | Texas Instruments Ti 30x Iis Scientific...

### How do i use log functions on the HP 39g+. For instance i want to use log10 1000 which should equal 3 or 3^5=243 so log3 243 should equal 5. If i press log the calculator shows: log( If i...

To calculate the common log ( LOG base 10) of a positive number, just press the LOG key, the one above the blue Division key, then enter the number and close the right parenthesis. Press the ENTER key to get the result.

If you want to calculate the log in a base other than e (natural) or 10 (decimal) logarithms, you need to make use of one of the equivalent formulas below

log_a(b)=log_10(b) / [ log_10(a)] or
log_a(b)= ln(b)/ln(a)

Apr 19, 2011 | HP 39g Calculator

### Conversion of log base 10 to log base 2

To calculate the log base 2 of a value, calculate its log and then divide by the log of 2. You can use either the log or the ln keys, but be consistent. For example, to calculate the log base 2 of 16, you can calculate either log(16)/log(2) or ln(16)/ln(2).

Nov 27, 2010 | Casio FX570MS Scientific Calculator

### Is there a log button? if not is there another way

Yes, there is a [LOG] key to calculate decimal logarithms (logs in base 10) it is marked LOG, and another key marked [LN] to calculate the natural logarithms (logs in base e).
You enter a positive number, then press the appropriate log key (LOG or LN) and the result will be displayed.

Jul 25, 2010 | Texas Instruments TI-30XA Calculator

### How do i calculate the log to a specific Base?

If you have the latest version of the firmware (2.53) you can use the logBASE function available in the CATALOG. If you don't have the latest firmware, you can get it from http://education.ti.com

Regardless of the firmware version, you can always compute the logarithm to any base by using the relationship

logb(x) = log(x)/log(b) = ln(x)/ln(b)

May 02, 2010 | Texas Instruments TI-83 Plus Calculator

### How do you change the base on the log function so you can do for example log with the base of 2 instead of base 10

Hi,
Your calculator cannot compute directly the logarithms in an arbitrary base, but you have the means to obtain that indirectly.
You can use either of the conversion formulas shown on the screen capture (on the right). On screen capture ln stands for natural logarithm.

If you want binary logarithms (logs in base 2) you use the relation
log_2 (x) =ln(x)/ln(2)
or
log_2(x)=log(x)/log(2)

Use whichever formula is shorter to key in (without pressing the 2nd key).

Hope it helps.

Nov 16, 2009 | Texas Instruments TI-86 Calculator

### How can I use the Log function on my calculator?

Hi ;

for log base 10 use the the "log" key

example :

log(2) + log(3) = log(6)

enter 2 press the log key you will get 0.30102999 press the '+" key than 3 log you should get 0.47712125 for it Press the "=" or enter and you should get 0.778151250 for a answer than press inv or 2nd log and you should get 6 for a answer

and that all there is to it

Oct 07, 2009 | Texas Instruments BA-II Plus Calculator

### Random based logarithms

to do logarithms with other bases, use change-of-base. let's say you want to do log base 5 of 25. for clarity i'll write this as log(5) 25. you would have to do log(10) 25 / log(10) 5 to get 2. key sequence: [LOG], 2, 5, ), / (divide), [LOG], 5, )

Apr 03, 2009 | Texas Instruments TI-83 Plus Calculator

### How to convert log

Hello, The first remark is this. The ratio log(0.8)/log(2) is by definition binary log of 0.8 ( meanibg log in base 2 of 0.8) The second remark is good news for you.: When in MathIO, [SHIFT][MODE][1:MathI0], your calculator can compute directly the log in any base of any number. To use the functionality, you press the key below [ON]. It is a log symbols with a small solid square, and and erect empty rectangle.
When you press the key the screen shos a template. In the smaller and lowered square goes the base (here 2). When you enter the base, press the right arrow to move cursor to the rectangle inside the parentheses and type in 0.8. Use the right arrow to move the cursor out of the parentheses.
Practice: try that. the result should be -0.321928095. Good. Now use the replay button to move cursor to the command line outside the right parenthesis. I am going to give you the other key stokes. Let log(2,0.8) be my representation for log in base2 of 0.8. Then you enter the rest of the calculation as
log(2, 0.8) [*] [ ( ] [(-)] 0.321 [ ) ] [*] 2500 [=]
Here [*] is the multiplication sign [(-)] is the negation (change sign), just above the [RCL] key.
[ ( ] is the left parenthesis and [ ) ] its matching right parenthesis. Both of them enclose the number -0.321. It underlined them for clarity.
The result should be 259.0716344
If you do not like what I did above, you can always do things the old way. You use the log key just above the [COS] key. In that case -0.3219*[LOG] (0.80)/[LOG] 2 * 2500. Do not to supply the ) for both log. The calculator inserts the left ones by default.
Hope it helps.

Dec 03, 2008 | Casio fx-300ES Calculator

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