Then 2 X 3^2 36
On Monday, September 22, 2014, Raul Miller <[email protected]> wrote: > 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] > <javascript:;>> 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] > <javascript:;>> 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 > -- Sent from Gmail Mobile ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
