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Laplace Transform Programs for the TI-89/92+

LZTRAN - LAPLACEX - INVLAPX 
to calculator page - start page - difeq main

Update: 02/13/03
.LZT

The menu program LZTRAN for the TI-89 top

This program and it's components are from ti.org (This program solves stuff that the others won't and it seems to be much quicker for the more difficult problems)
You need Graphlink and a cable.  See the Calculator page for more info and links.

It does Laplace transforms and inverse transforms and much more.  Use h(t - a) for usf's.

Nobody but you are responsible if you mess up your calculator with this software...just like Microsoft.

Don't forget that on tests, unless you show work, you will not get any (0) credit even if your answer is correct.

If work is shown and it incorrectly leads to a correct answer ("does not follow"), you may get 15 points taken from a 10 point problem (for trying to pull a fast one on your instructor).

If you want to read the lzt.txt document, you need to read the following first:  It must be read in DOS mode (if you want to read it...there are some examples...you can try it in Windows if you want...some is readable) or not all characters will be readable.  When you get done reading it and want to leave DOS mode, type "end" or your computer will not re-start in Windows Mode and you may have to spend the rest or your computer life in DOS mode (until you type end when in DOS mode).  To get in DOS mode, click Start and Shut Down then select the button Restart in MS-DOS mode.  You need to have saved the text file in a convenient place to find it since finding it in DOS mode is not pleasurable except for GEEKS.  I suggest saving it in the WINDOWS directory since that's where you may start when in DOS mode.   Type "dir|more" to see if it is in the directory that you are in and then type "type lzt.txt|more" to read the file.  If you don't type the vertical | and more, you better be prepared to read very fast. the file name is (in caps) LZT.TXT

lzt.txt (if you want to read it in DOS mode, click File on your browser (top left) and save it to the Windows directory so you know where it is...then follow the instructions in the paragraph above)

Installation:

Send the file named lztr7.89g to your calc lztR7.89g
on calc: Run lzt\install() and choose "Archive"

Check by pressing MODE if these options are set before using:

ANGLE to RADIAN
COMPLEX FORMAT to RECTANGULAR
EXACT/APPROX to AUTO

These functions will be Included after installation in the lzt directory:

ltrn( f(t) , t , s ) Laplace transformation
invl( F(s) , s , t ) inverse Laplace transformation
finvl( F(s) , s , t ) fast - || -
ztrn( f(k) , k , z ) Z transformation
invz( F(z) , z , k ) inverse Z tr.
finvz( F(z) , z , k ) fast inv. Z tr.
heav2dir( f(k) , k ) heaviside -> discrete dirac

You will probably have this problem unless you have installed a kernel.

Q: It produces an error "Invalid program reference"
A: It means that you are using Advanced Mathematics Software (AMS) 2.0x
without any installed kernel.
1. Patch the OS (don't if already patched)
    Send and run file hw2patch.89z and delete it after. hw2patch.9xz
2. Send and run file kerno.89z KerNO.9xz You can delete this also if you like...to uninstall, run it again.
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!! Install only one kernel !!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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The person that wrote this is obviously an excellent programmer and knows his DifEq.  See the text file.

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LAPLACEX

This program has origin unknown at the moment.
You need Graphlink and a cable.  See the Calculator page for more info and links.

It does Laplace transforms. Use u(t - a) for usf's.

Nobody but you are responsible if you mess up your calculator with this software...just like Microsoft.

Don't forget that on tests, unless you show work, you will not get any (0) credit even if your answer is correct.

If work is shown and it incorrectly leads to a correct answer ("does not follow"), you may get 15 points taken from a 10 point problem (for trying to pull a fast one on your instructor).

Installation:

Send the file named LAPLACEX.89F to your calc 

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INVLAPX

This program has origin unknown at the moment.
You need Graphlink and a cable.  See the Calculator page for more info and links.

It does inverse Laplace transforms.

Nobody but you are responsible if you mess up your calculator with this software...just like Microsoft.

Don't forget that on tests, unless you show work, you will not get any (0) credit even if your answer is correct.

If work is shown and it incorrectly leads to a correct answer ("does not follow"), you may get 15 points taken from a 10 point problem (for trying to pull a fast one on your instructor).

Installation:

Send the file named INVLAPX.89F to your calc

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