Not sure where to put this....TI-83+

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Circuitbreaker8

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So i'm taking an exam for my business/finance class on monday and it has those god aweful matrices. My friend that took the class before said it was 25x35 and if you mess up on any little thing you pretty much fucked the entire test up. I'm not gonna fake, I never understood them. I tried recalling through my notes and online and they make some sense but not once you get into the really long detailed ones. The prof. said we can use our calculators but only to check, and there is going to be one problem that is worth 25% of the test. Go figure.

This is where my TI-83+ comes into play. I can't remember the last time I had to deal with matrices so I need a little help from you folks :) Is there any way to have the TI-83+ show all steps involved in solving a matrix? I know if you go to matrix->ref (or rref) you pretty much get the answer but I need the juicy details in between....

Any tips regarding these stupid things is highly appreciated!!
 
you want it to show the steps?

nope, thats not possible on an 83.. sorry.. you can make a program that does every step for it though... that will show em.
 
SippieCup said:
you want it to show the steps?

nope, thats not possible on an 83.. sorry.. you can make a program that does every step for it though... that will show em.
Click to expand...

I figured. Are there websites with user based programs out there?

Also, I know how to find the inverse (easy) but how would I solve a system of eq. using the inverse on the TI-83+?
 
You have to handle 25x35 matrices by hand?

That just sounds painful, and I actually like math.
 
Circuitbreaker8 said:
I figured. Are there websites with user based programs out there?

Also, I know how to find the inverse (easy) but how would I solve a system of eq. using the inverse on the TI-83+?
Click to expand...

the programming language is called TI basic i believe.. its reallllly easy.

when i program stuff for it i do this..

1) i pick a problem thats pretty simple.
2) solve the problem as detailed as possible.
3) see what i do in each step, and then step by step program it into the calculator, making sure every step is right before continuing.
4)once done, put the problem you did into the calculator and have it run, if the number is wrong.. go back and debug.

you can check out the wiki, it'll tell you the basic functions to use.

be sure that the output is correct and as you want it to be seen.. for example when converting from degrees to radians, dont use pi in the program at all (as it will always been in the numerator), until the end.. where you just add it to the end of the output function that outputs the answer.. this is a little more advanced but here is an example:

Output(2,1,ANS) this will display the variable ANS at row 2 column 1
Output(2,4,"pi") this will display the text "pi" starting at row 2 and column 4

you can replace pi w/ the pi symbol ofc.
Click to expand...
 
It's been about 8 years since I've had to use a TI brand calc. From what I remember, the lower end models (82, 83, 85) never had any step by step solving abilites. The higher end ones like the 89 and 92 did. I'm sure you could probably find a matrix solver on this website: http://www.ticalc.org/
 
Wow 25x35 matrix exam problem and you have to reduce it by hand? What is your professor thinking?

There are a few red flags with that problem. I'll give you a hint to solve such a problem.

Assuming that there is linear independence (meaning that each variable has a corresponding value), this tells me that 10 linear equations (rows) can be reduce down to 0's. So the first thing I would look for is to see if there are linear equations that are some linear combination (multiple) of each other. If this is the case, then you can toss out all the formulas that are a linear combination of another. This will reduce the number of rows you have to deal with.

Best of luck.
 
I used to write notes in the program editor and then to read them you just go back and edit the program. That requires you to find the steps on your own though.
 
well this is going to take a long time....... what class requires you?!!! to do matrix
 
Anything over 4x4 is just retarded, it would take you forever, literally all day, to do something that huge.
 
Yeah I seriously doubt he will have to solve a matrix that large. It would take an insane amount of tedious algebra that leaves alot of room for error. The only real way to solve a matrix like that would be something like Maple or Mathematica. That said, why doesn't the op just learn the math like he is suppose to rather than trying to have a calculator do it for him?
 
nope...
My math teacher (notice teacher so im not college yet) has read the manuals for the ti 83 and 84 inside and out and there is no way to do it.... just plug in numbers and let er chug.

though your professor sounds like a sadist who likes to see you guys sweat and suffer.

man and i had troubles getting 4x4's....and im sitting here trying to figure out how to do it again xD

Best of Luck!
 
Won't they clear the memory before the exam? I always had to.
 
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