Re: Circular definition/TI92


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Re: Circular definition/TI92



The plus modul;e is supposed to get around this garbage.
Ben Sultenfuss wrote in message <003e01bd5e65$828f9e40$e4c06090@micron>...
>Older TI-92s did not incorporate a Circular Definition Error.
>Beginning with version 1.4 (about) TI included some code that gave a
circular
>definition error for what you are trying.
>
>To see the version type F5 then hold down the diamond key and press the
left
>paren ( key.
>
>I have a version 1.3 that performs the operation you describe, and a
version
>1.7 that gives the Circular Definition Error.
>
>To get around this, define the function as perhaps
>f(u,v)=5+4*u-2*u^2+3v-v^2
>then evaluate
>f(x,-x)
>------------------------------------------------------------------
>Ben Sultenfuss <bsultenfuss@sfasu.edu>
>Stephen F. Austin State University
>Department of Mathematics and Statistics
>1936 North Street, PO Box 13040, SFA Station
>Nacogdoches, Texas 75962-3040
>Voice: Office: 409-468-3805   Home: 409-560-5508
>Fax: Office: 409-468-1669   Home: 409-560-0038
>Office Hours:  Tuesday and Thursday: 9:00-10:30am Central
>                       Monday through Thursday: 2:30-4:30pm Central
>
>-----Original Message-----
>From: Christine Hood <hood@HOPI.DTCC.EDU>
>To: GRAPH-TI@LISTS.PPP.TI.COM <GRAPH-TI@LISTS.PPP.TI.COM>
>Date: Thursday, April 02, 1998 10:31
>Subject: Circular definition/TI92
>
>
>>Hi, I've been monitoring this list for quite some time now and have found
>>some of the discussions very interesting. Now I have ran across a problem
>>that has me baffled.
>>
>>I have entered the following into my 92:
>>
>>Define f(x,y)=5+4*x-2*x^2+3y-y^2
>>f(x,-x)
>>
>>The answer I received was: -3*x^2 + x + 5
>>
>>Two other students entered the same information into their 92's and got
>>the same answer.
>>
>>A third student entered the same information into his 92 and got the
>>error message "circular definition". Why?
>>
>>Thanks in advance for any help!


References: