Mathematica 9--Is This A Joke?

• To: mathgroup at smc.vnet.net
• Subject: [mg128850] Mathematica 9--Is This A Joke?
• From: Kevin Wheelock <jiyajbe at gmail.com>
• Date: Fri, 30 Nov 2012 05:57:25 -0500 (EST)
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• Delivered-to: l-mathgroup@wolfram.com
• Delivered-to: mathgroup-newout@smc.vnet.net
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```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!

```

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