Re: ReplacePart
- To: mathgroup at smc.vnet.net
- Subject: [mg131644] Re: ReplacePart
- From: Itai Seggev <itais at wolfram.com>
- Date: Sun, 15 Sep 2013 07:07:47 -0400 (EDT)
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On Sat, Sep 14, 2013 at 06:02:59AM -0400, man21 wrote:
> Hello,
>
> As a result of a calculation, I end up with a list of numerical values
> which contains some "Indeterminate".
>
> x ={-1.25664, 0.628319, -0.628319, 1.25664, Indeterminate, -1.25664,
> 0.628319, -0.628319, 1.25664, Indeterminate}
>
> I try to replace the "Indeterminate" by "0", using :
>
> ReplacePart[x, {5, 10} -> 0.]
>
> but this dosen't work. Any idea why, and how to do it ?
A flat list in ReplacePart is interpreted as a single multi-level part
specification. For example,
In[282]:= ReplacePart[Array[a, {2, 2}], {1, 2} -> 0.]
Out[282]= {{a[1, 1], 0.}, {a[2, 1], a[2, 2]}}
What you want is this.
In[280]:= ReplacePart[x, {{5}, {10}} -> 0.]
Out[280]= {-1.25664, 0.628319, -0.628319, 1.25664, 0., -1.25664, \
0.628319, -0.628319, 1.25664, 0.}
I think in any event it is easier and better to use ReplaceAll
In[283]:= x /. Indeterminate -> 0.
Out[283]= {-1.25664, 0.628319, -0.628319, 1.25664, 0., -1.25664, \
0.628319, -0.628319, 1.25664, 0.}
--
Itai Seggev
Mathematica Algorithms R&D
217-398-0700
- References:
- ReplacePart
- From: man21 <man21@free.fr>
- ReplacePart