Services & Resources / Wolfram Forums / MathGroup Archive
-----

MathGroup Archive 2012

[Date Index] [Thread Index] [Author Index]

Search the Archive

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
>
>
>
>
>




  • Prev by Date: Re: Improvements to Mathematica 9 Frontend?
  • Next by Date: Re: Mathematica 9--Is This A Joke?
  • Previous by thread: Re: Improvements to Mathematica 9 Frontend?
  • Next by thread: Re: Mathematica 9--Is This A Joke?