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Messages - apcalc
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646
« on: January 14, 2011, 04:03:32 pm »
I would say it is very stable. I have been using it for a few weeks not and I have not had any problems for a while! 
647
« on: January 13, 2011, 11:09:29 pm »
I'll take a guess even though I know I'll probably be wrong... Sir Issac Newton EDIT: Yep, I wrong. Way off. 
648
« on: January 13, 2011, 09:55:04 pm »
Sadly, Ndless 1.7 does not work on OS 2.0.1 The current development version of Ndless, Ndless 2.0, will work on that OS, but binaries are not being distributed now. In order to use it, you have to build it yourself. The purpose of overclocking the Nspire would be to make it do stuff faster, essentially. That is why TI uses it themselves in OS 2.1!
649
« on: January 13, 2011, 07:15:08 pm »
Happy Birthday!  * apcalc looks around for a bag of birthday peanuts
650
« on: January 13, 2011, 06:34:21 pm »
Also, there is already a data collection app, but I forgot how to access it.
Access it with ctrl+D, I believe.
651
« on: January 13, 2011, 03:25:36 pm »
Lets hope they don't do away with the TI-84 emulator to try to save some space. 
652
« on: January 12, 2011, 08:38:16 pm »
Thank you for your information, critor! I updated the original post to reflect these new developments!
653
« on: January 12, 2011, 07:11:03 pm »
Does this work with Ndless 2.1 with a touchpad?
this looks good and I'd like to use it.
Even if the surviving binaries of this were released, it would only be compatible with Ndless 1.1 (unless someone wanted to hex edit it), essentially, it would not work with the touchpad.
654
« on: January 12, 2011, 03:15:21 pm »
While browsing the TI website today, I came across this link: http://education.ti.com/educationportal/sites/US/productDetail/us_nspire_lab_station.htmlApparently, TI is releasing a new "lab attachment" for the TI-Nspire that will act much like CBL 2 for the TI z80/68k series of calculators. Apparently, this device attaches to the Nspire much like the wifi adapter for TI-Navigator. Before the release of this, the Nspire had limited capabilities with previous lab collection devices, with the CBL only working on the non-CAS Nspire in TI-84+ mode. This new tool could also be a possible reason why TI started using BSD code starting in OS 2.0: http://ourl.ca/6366/127170UPDATE:After checking Vernir's website, critor reports that this accessory will require TI-Nspire OS Version 3.0. Likewise, there is a mention of an "App" for this new data collection software. TI has traditionally refereed to the "Calculator", "Graph", "Notes", etc. features of the Nspire as "Apps", but it would seem useless to require everyone to have the "App" for this data collection accessory, since most Nspire users will most likely never even see it. Could this mean that true "App" support is coming? Only time will tell, but we will know before April 2011, the set release date for this new accessory. What could be in store with a new OS 3.0? This accessory suggests individual App support, but what other features might come? Will 3-D graphs finally be added to the Nspire? Will the hack of Ndless 2.0 be officially blocked? Will there be tougher downgrade protection? Only time will tell! Thank you, critor, for you further investigations of this on Vernir's website! Here is the link: http://www.vernier.com/calc/ti-nspire/cradle.htmlHere is a picture of the new lab station from the above page on TI's website: 
655
« on: January 11, 2011, 08:22:30 pm »
There is a really amazing algorithm for finding the area of ANY closed shape, not just triangles, if you know the coordinates of all the verticies. For instance, take any pentagon with verticies (X1,Y1) through (X5,Y5). You can find the area by listing the pairs clockwise and making the first point appear at the end too:
X1 Y1
X2 Y2
X3 Y3
X4 Y4
X5 Y5
X1 Y1
Then you multiply diagonally down on each side and find the sums of those 2 columns:
X1 Y1
Y1*X2 / X2 Y2 \ X1*Y2
Y2*X3 / X3 Y3 \ X2*Y3
Y3*X4 / X4 Y4 \ X3*Y4
Y4*X5 / X5 Y5 \ X4*Y5
Y5*X1 / X1 Y1 \ X5*Y1
______ ______
SumLeft SumRight
The area of the shape is simply the difference of these 2 sums: |SumLeft - SumRight|
It even works if the lines pass through each other or the shape has holes in it.
That is the Shoelace formula I was talking about earlier! After writing that post, I made a nice Java program to do that formula for you! Ah yes, I could be wrong, but I think I recall something like that done to find an approximate value for Pi
Do you mean when they used shapes like a regular 100-gon, found the area of that, and used that to estimate Pi?
656
« on: January 11, 2011, 05:59:10 pm »
Or, use Hero's formula:
Area = the square root of ( s (s-a) (s-b) (s-c) ) when a, b, and c are the three sides and s is the semi-perimeter ( 1/2(a+b+c) )
you mean Heron's?
This can be refered to as both Hero's and Heron's formula. When I was in geometry, I remember reading ahead in my book to get this formula, and it said that both names are commonly used. I think there also is a formula called the "Shoelace Formula" for finding the area of a triangle, but I never really investigated on how to go about using that formula. EDIT: Er, I guess the Shoelace Formula can be used to find the area of any polygon where the verticices are given ordered pairs as points.
657
« on: January 11, 2011, 05:36:30 pm »
Hello! While updating the level passwords in Block Dude to be compatible with OS 2.1, I discovered that my current method of inputing a password isn't working. As a solution to this, I would like to be able to use a dialog box with an input field where one could type in the password instead of having to rely on key combinations. Is this possible to do, or is it only possible to make a dialog box with the single "OK" button? Thank you in advance for any help!
658
« on: January 11, 2011, 04:20:31 pm »
But, a ti8x version of nleash would probably be made a few days later
I would say it would probably be made within a day.
659
« on: January 11, 2011, 03:37:09 pm »
On a side note, the PDF I linked to on the first post mentions that the OS on the Nspire is OS 2.56MP. Would this mean a release of OS 2.2 is imminent?
I would say most definately. We have been expecting an OS update for the Nspire in feb/march since the release of OS 2.1 (to coincide with T^3). Likewise, there is some discussion of OS 2.2 on TI-Bank.
660
« on: January 11, 2011, 03:34:10 pm »
Wasn't expecting this today... When I first read "OS 2.55MP" released, I thought it would be a joke They must have some hidden motive for releaseing an OS with almost no updates ( * apcalc remembers OS 2.1 )...
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