Re: Sigma notation for 86

To: CALC-TI@LISTS.PPP.TI.COM
Subject: Re: Sigma notation for 86
From: Ben Sultenfuss <bsultenfuss@SFASU.EDU>
Date: Thu, 11 Dec 1997 06:45:53 -0600
Comments: To: Jeff Tyrrill <Jeff_Tyrrill@MSN.COM>
Reply-To: Ben Sultenfuss <bsultenfuss@SFASU.EDU>

Combine the commands
sum(seq(2x,x,1,4))
prod(seq(2x,x,1,4))
------------------------------------------------------------------
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
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----------
> From: Jeff Tyrrill <Jeff_Tyrrill@MSN.COM>
> To: CALC-TI@LISTS.PPP.TI.COM
> Subject: Re: Sigma notation for 86
> Date: Wednesday, December 10, 1997 23:00
>
> Yes. Use the SEQ() function. For example, type:
>
> seq(2x,x,1,4)
>
> where 2x is the expression, x is the var to be changed, and 1 and 4 are the
> minimum and maximum. A list will be generated. An optional (I think it's
> optional) 5th argument says the step value. The default is 1. A step value
> of 3, for example, would increase x by 3 rather than 1. If the step value
> is negative, then the "minimum" value should be larger than the "maximum"
> value.
>
> If you get an ERROR: ARGUMENT, then add ,1 to the end of the function.
>
> To sum the list, type
>
> sum(Ans).
> ________________
>
> Jeff Tyrrill
> http://tyrrill-ticalc.home.ml.org/
> http://ti-philes.home.ml.org/
>
>
> -----Original Message-----
> From:   Undetermined origin c/o LISTSERV administrator
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> Sent:   Wednesday, December 10, 1997 8:44 AM
> To:     CALC-TI@LISTS.PPP.TI.COM
> Subject:        Sigma notation for 86
>
> Is there a way to do sigma notation on the 86 similar to:
>
> 4
> E 2x
> x=1
>
> And the calc will hopefully return:
>
> 2, 4, 6, 8