Re: Mathematica 9--Is This A Joke?

*To*: mathgroup at smc.vnet.net*Subject*: [mg128860] Re: Mathematica 9--Is This A Joke?*From*: Kevin Wheelock <jiyajbe at gmail.com>*Date*: Sat, 1 Dec 2012 04:32:09 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-newout@smc.vnet.net*Delivered-to*: mathgroup-newsend@smc.vnet.net*References*: <20121130105725.8B47768B0@smc.vnet.net> <668C2D8E-5B87-42CF-A504-88E897F3DC12@math.umass.edu>

Hi, Yes, I read the docs after one of my existing documents failed. (Naively, I initially assumed my docs created in version 8 would work in version 9...Nope.) And, your description of how to get units points to my comment about Usability Testing. In what universe is typing M := Quantity[ (okay, hold on, let's find out what the unit is; Control+= 1 Newton --> Wolfram|Alpha, <wait...> Okay, it's "Newtons", not "Newton") 10, "Newtons"] better than typing M := 10 Newtons? It takes ten times as long, and the resulting code is far less readable. I have run into several other major bugs already, but I will try to keep to one topic per post. I don't want to rant--though this Math9 is testing my restraint... On Nov 30, 2012, at 6:53 AM, Murray Eisenberg wrote: > No need to be "horrified". Just read the docs! > > Yes, there's not "Newton". But did you notice that "Kilograms", "Meters", and "Seconds" are all plural. So is "Newtons"! > > This is easy to discover: Use the Control + = special input form for calling Wolfram|Alpha with input > > 1 Newton > > (You'll get result 1 N.) But then put //InputForm on the cell and evaluate again. You'll get: > > Quantity[1, "Newtons"] > > > On Nov 30, 2012, at 5:57 AM, Kevin Wheelock <jiyajbe at gmail.com> wrote: > >> I just installed Mathematica 9. I am horrified. How did this get past QA and Usability Testing? >> >> Example: Newton's 2nd Law >> >> In Mathematica 8: >> >> In[1]:= Needs["Units`"] >> >> In[2]:= M := 5 Kilogram >> >> In[3]:= a := 10 Meter/Second^2 >> >> In[4]:= F := M a; F >> >> Out[4]= (50 Kilogram Meter)/Second^2 >> >> In[5]:= Convert[%, Newton] >> >> Out[5]= 50 Newton >> >> >> >> In Mathematica 9: >> >> In[1]:= M := Quantity[5, "kg"] >> >> In[2]:= a := Quantity[10, "m/s^2"] >> >> In[3]:= F := M a; F >> >> Out[3]= 50kg m/(s)^2 >> >> {At this point, Mathematica pops up a dialog offering, among other = things, to let me convert this unit. Okay, I enter "N" in the field I = was presented} >> >> In[4]:= UnitConvert[ >> Quantity[50, ("Kilograms" "Meters")/("Seconds")^2], "N"] >> >> During evaluation of In[4]:= UnitConvert::unkunit: Unable to = interpret unit specification N. >> >> >> Out[4]= UnitConvert[50kg m/(s)^2,N] >> >> {Huh. Okay, I try other things...} >> >> In[5]:= UnitConvert[ >> Quantity[50, ("Kilograms" "Meters")/("Seconds")^2], N] >> >> During evaluation of In[5]:= UnitConvert::unkunit: Unable to = interpret unit specification N. >> >> >> Out[5]= UnitConvert[50kg m/(s)^2,N] >> >> In[7]:= UnitConvert[ >> Quantity[50, ("Kilograms" "Meters")/("Seconds")^2], "Newton"] >> >> During evaluation of In[7]:= UnitConvert::unkunit: Unable to = interpret unit specification Newton. >> >> >> Out[7]= UnitConvert[50kg m/(s)^2,Newton] >> >> In[8]:= UnitConvert[ >> Quantity[50, ("Kilograms" "Meters")/("Seconds")^2], "Newtons"] >> >> Out[8]= 50N >> >> {Ha! I finally guessed right!} >> >> Who the HELL thinks this is better????? "M := Quantity[5,"kg"]"??? = Are you KIDDING ME???? >> >> Give me back version 8, and QUICKLY! > > --- > Murray Eisenberg = murray at math.umass.edu > Mathematics & Statistics Dept. > Lederle Graduate Research Tower phone 413 549-1020 (H) > University of Massachusetts 413 545-2838 = (W) > 710 North Pleasant Street fax 413 545-1801 > Amherst, MA 01003-9305 > > > > >