I know this is outside of the normal topics discussed on this site but I felt a serious need inform others about hidden functionality on the Texas Instruments TI-89.
Recently in my math class I was required to use the log function on my TI-89 Titanium. I couldn’t find it except by using the catalog. I read the manual and searched on the internet, I couldn’t find a better method, I in fact fount a lot of worse methods. So sitting in class I started pushing the alternate function keys and pressing all the keys without their alternate function listed. The calculator does in fact have a quick key for the Log function. Diamond & 7
Total Commitment Blog 
Just one more example of the cryptic input for the TI-89. Shame on Texas Instruments.
sweet lord thank you. i
Thank you soooooooo much!
Diamond & 7? where is the diamond key?
The diamond key is the green key with the black diamond in the middle, the second key from top on the left hand side of the calculator.
PRAISE ALLAH
Thank you sooooo much. You do not believe how troubling this was for me.
Awesome find! Been searching online for this shortcut, glad someone found an easier way than scrolling through the catalog
I pressed diamond & 7 for log function. But I am not able to get it in TI 89. when I checked it using diamond EE, 7 has been assigned to some other KBDPRGM. How can I set it to log?
I have found also more like hidden key shortcuts if you press
DIAMOND & EE key (next to the number 4)
this helped a ton! just another way to find it, a little annoying but always certain.
http://www.wisc-online.com/objects/ViewObject.aspx?ID=eng13204
i am very thankful you found this! To get by this problem i found the following instructions that have worked for me for a while, it actually is pretty useful for a quick log function for non base 10 stuff: make a function that does the log base anything of anything. try this: define Logg(a,b)=ln(b)/ln(a) or you could do ln(b)/ln(a)-> Logg(a,b) (ps the ‘->’ is the store button on your calculator. I think define is f4 or something, if you can’t find it look in your catalogue)
Thank you so much Diamond and 7 is just what I needed to know!!!
Thank you!!!!!!! This was driving me crazy!!!
I knew there had to be another way!!!! geeeeeeez!!!! lol! Thank you!!!!
God bless you, sir.
Yes! God Bless you!!! Even over a year later after your post… I thank God I found it!!!
Thanks man… I was getting so tired of using ln(?)/ln(10) over and over again.
You Rock!! Thank you!! I was trying to figure out how to do these problems!!
Bless you sir, bless you!
thanks a lot!!!
THANKS!
Thank you soooo much! God bless you!
THANK YOU I LOVE YOU SO MUCH
THANK YOU SO MUCH FOR THIS! I was typing in LOG with the alpha key rather than go through the catalog. This makes my life so much easier as I needed the Log to find pH in chem class.
God Bless you you help me so much !!!THANKS A LOTTTTTTTTTTTTTTTTTTTT
THANK YOU!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Thanks!!! it has releived alot of headaches!
Thank you! I’ve have had my TI-89 Titanium for six years and had no idea you can get log without having to go into the catalog.
It really works. You’ve saved my day. Thank you so much for sharing, we really apreciate your kindness.
This is not so on the TI-89 just the TI-89 Titanium it would seem.
i need help how do i type in Log1200=x on my ti 89 titanium???
This was so helpful! I scavenged through so many websites and this saved me the day before my midterm. THANKYOOOOU!
THANK YOU for posting this! My brain hurt trying to find this in the catalog each time.
I happen to press diamond 7 and it does not work for me. Help?
Yo thanks this shit is beast fuck yeah you’re so sick the man bromanseph
fuck that shit was pissin me so off but saved day super cool man
To calculate log base 2 of a number type log(number,2)
Awesome! Thanks!
THANKS A LOT.
Thank you
Thank you!
ohhh wow! thanks a bunch! was raging last night just to find this button
most useful blog on the internet award goes to…..*opens envelope suspensefully* You! thanks for posting 😀
press (diamond) EE, there are shortcuts for the TI89. ie: (diamond then division key for factorial) (can’t live without that one!). diamond EE will bring you to the variety of commonly or not so commonly used shortcuts. they seem to be interchangeable between the two 89’s. both have a menu under the same (diamond) EE. diamond 7, however, is the titanium feature. check the individual menus
Thank you for sharing! You rock!
you just saved my life good sir.
THANK YOU VERY MUCH ANDTHANK YOU GOD!!!!!!!! WONDERFUL WORK MY GOOD SIR!!!
God bless you for sharing this! I bought this new Titanium a day before my Math test (not a very smart move) and I was trying to figure it out… Thank you! thank you!
ASDFGHJK THANK YOU!
Oh lordie thank you! I was falling behind in class because I couldn’t find this function for homework
I love you so much, WTF Ti morons
I have a ti-89 titanium and diamond 7 doesn’t work on mine! Please help!
Press [Diamond] and then [EE] to see a full layout of keys that are used with the diamond key. It should be on there. On my TI-89 titanium the [Diamond] key then the [7] key brings up log(
this is beautiful omg thank you so much
I jizzed in my pants! Thanks!
What a time-saver! Thanks a lot, you rock!
whoah this weblog is magnificent i like reading your posts.
Keep up the good work! You understand, many persons are hunting round for this info, you can help them greatly.
Thank you so much!! you are freaking awesome!!!!
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its very frustrating to buy an expensive calculate like the ti-89 and can’t really work with it in class because the instruction to navigate the product is only located on line. with the amount of money spent on this item it should have some kind of basic instruction. didn’t figure out the online business until toward the end of my semester. my math class is not based on using this calculator and computer product in class. it’s based on using only this product and knowing how to navigate it to solving problems such as the logarithms function which is not explain how to find the key functions.
Sweet program to help you in the next exam:
http://calculus-made-easy.blogspot.com/
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LORD HAVE MERCY ON YOUR SOUL
I was staring at my calculator thinking where the **** is the log key thank you so much for posting
Oh my God thank you
Diamond 7
thank you thank you thank you thank you
Hi there mates, its impressive post about educationand fully explained, keep it
up all the time.
Thanks so much!!!
Someone should slob your knob for this. Not me, but someone. Good lord what a helpful fucking thing to have discovered.
When I enter log(15) on my calculator, it gives me log(15) as an answer. How do I get the actual answer?
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I have spent soooo much time trying to figure this out, thank you so very much. Not sure why it should have been this difficult figure out. If you’re working with Logs, your not a dummy, shame on TI for not making this clear
This is awesome that the OP posted in 2009, and people like me are still finding this in 2015. I’m sure you’ve moved on, OP, but thank you, thank you, thank you!
thank youso much!!!
THANK YOU!!!!! Years after you posted this and I needed it so much today! Thank you, thank you!
THANKS BUDDYYYYYYYY
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