Consider using: X=:conjunction def 'm +/ .* n'
with a new rule: use X to multiply, instead of asterisk. Thanks, -- Raul On Mon, Sep 22, 2014 at 9:39 AM, Kip Murray <[email protected]> wrote: > My experience was that college calculus students using J in a computer lab > had difficulty with > > 2*3+4 > 14 > > --their TI calculators gave the desired answer 10. I told them "always > parenthesize multiplications, divisions, exponentiations, and f x", but > they forgot. > > I supplied hidden definitions for fn, pi, sin, cos, etc. so that > > f =: '(2*y)+4' fn > > defined what is colloquially called the 2x+4 function. > > There I went beyond grade school, but the remark about TI calculators would > apply to grade school. Children are taught PEMDAS for order of operations: > Parentheses, Exponentiation, Multiplication, Division, Addition, > Subtraction. I am aware Ken pointed out inadequacies of this rule. TI's > Algebraic Logic System is complicated! > > On Monday, September 22, 2014, Brian Schott <[email protected]> wrote: > >> I suspect I have told this tale before, but JHS has renewed my enthusiasm >> for the results. >> >> Back in the '80s I was teaching in a brand new computerized classroom >> where each student had a computer and the instructor had both the computer >> and a large display screen. The computers were all linked to a school wide >> wired network and was administered by the IT department. One of the people >> in the IT department wrote a special program for me that enabled my >> students to anonymously type one-line messages on their own computer and >> the results were displayed on the instructor's computer and on the >> classroom's large screen. >> >> I would ask questions and the students could type their answers with >> confidence that others would not know their identity.Their answers were >> like today's text messages and did not have any calculation involved. From >> the front of the classroom I was able to comment on answers and help >> students who were having trouble very effectively, I think. >> >> Wouldn't JHS in a modern classroom enable a similar situation if each >> student brings his or her own tablet? And the messages could be typed in J >> phrases (even without a graphics result from the likes of plot and viewmat) >> or in NB.'ed text. >> >> Does anyone have experience with this? >> >> >> --- >> (B=) >> ---------------------------------------------------------------------- >> For information about J forums see http://www.jsoftware.com/forums.htm >> > > > -- > Sent from Gmail Mobile > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
