Re: Mathematica 9--Is This A Joke?
- To: mathgroup at smc.vnet.net
- Subject: [mg128888] Re: Mathematica 9--Is This A Joke?
- From: Matthias Bode <lvsaba at hotmail.com>
- Date: Sun, 2 Dec 2012 05:00:01 -0500 (EST)
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Hola: The SI units' correct names are given in the singular form: Cf.: http://www.bipm.org/utils/common/pdf/si_brochure_8_en.pdf http://physics.nist.gov/cuu/Units/units.html The plural is wrong. The unit "siemens" is singular too although its last letter is s; it was named after after Ernst Werner von Siemens. Best regards, MATTHIAS BODE S 17.36398=B0, W 66.21816=B0,2'590 m. AMSL. > From: murray at math.umass.edu > Subject: Re: Mathematica 9--Is This A Joke? > To: mathgroup at smc.vnet.net > Date: Sat, 1 Dec 2012 04:35:30 -0500 > > 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> wro= te: > > > 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 > > > > > > =