Re: Sigma notation for 86

To: CALC-TI@LISTS.PPP.TI.COM
Subject: Re: Sigma notation for 86
From: Jeff Tyrrill <Jeff_Tyrrill@MSN.COM>
Date: Wed, 10 Dec 1997 21:00:48 -0800
Reply-To: Jeff Tyrrill <Jeff_Tyrrill@MSN.COM>

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/


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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