RE: Union[{Pi, N[Pi]}]
- To: mathgroup at smc.vnet.net
- Subject: [mg12750] RE: [mg12739] Union[{Pi, N[Pi]}]
- From: Ersek_Ted%PAX1A at mr.nawcad.navy.mil
- Date: Wed, 10 Jun 1998 03:04:12 -0400
- Sender: owner-wri-mathgroup at wolfram.com
Mark McClure wrote:
|
|
|We've seen the Union[{0,0.}] discussion. Here's a little variation
|which seems a little trickier.
|
|In[8]:=
|N[{3.141592, Pi}, 3] // Union
|
|Out[8]=
|{3.14,3.14}
|
|
In[1]:=
N[{3.141592, Pi}, 3] //InputForm
Out[1]//InputForm=
{3.141592, 3.141592653589793}
You probably expected they would both get rounded to 3 decimal places.
N[expr, 3] gives the same result as N[expr]. At least that's what I
see from the lines below.
In[2]:=
x1=N[Pi,3];
x2=N[Pi];
In[3]:=
InputForm[x1]
Out[3]//InputForm=
3.141592653589793
In[4]:=
InputForm[x2]
Out[4]//InputForm=
3.141592653589793
In[5]:=
Precision/@{x1,x2}
Out[5]=
{16,16}
This also explains the other results you reported. _________________
Ted Ersek