R: R: ReplacePart -> eliminate
- To: mathgroup at smc.vnet.net
- Subject: [mg131671] R: R: ReplacePart -> eliminate
- From: "Brambilla Roberto Luigi (RSE)" <Roberto.Brambilla at rse-web.it>
- Date: Wed, 18 Sep 2013 06:29:24 -0400 (EDT)
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Many thanks Bob!
I find great
Cases[y, {_?NumericQ ..}]
Since it works both with simple list and couple list.
What the meaning of .. operator?
Roberto
Da: Bob Hanlon [mailto:hanlonr357 at gmail.com]
Inviato: mercoled=EC 18 settembre 2013 04:41
A: Brambilla Roberto Luigi (RSE)
Cc: MathGroup
Oggetto: Re: R: ReplacePart -> eliminate
y = Table[{n, 1/(3 - n)}, {n, 0, 5}] // Quiet
{{0, 1/3}, {1, 1/2}, {2, 1},
{3, ComplexInfinity},
{4, -1}, {5, -(1/2)}}
Note that your crtiteria in the Select does not produce a straight True or False
{NumberQ[#], NumberQ[#]} &[{2, 1}]
{False, False}
num = Select[y, And @@ NumericQ /@ # &]
{{0, 1/3}, {1, 1/2}, {2, 1},
{4, -1}, {5, -(1/2)}}
However, Cases is a better choice here
num ==
Cases[y, _?(And @@ NumericQ /@ # &)] ==
Cases[y, {_?NumericQ, _?NumericQ}] ==
Cases[y, {_?NumericQ ..}]
True
Bob Hanlon
On Tue, Sep 17, 2013 at 9:36 PM, Brambilla Roberto Luigi (RSE) <Roberto.Brambilla at rse-web.it> wrote:
Great!
Many thanks Alexei!
Now I have the following list of couples
y = Table[{n, 1/(3 - n)}, {n, 0, 5}]
{{0, 1/3}, {1, 1/2}, {2, 1}, {3, ComplexInfinity}, {4, -1}, {5, -(1/2)}}
The command
Select[y, {NumberQ[#], NumberQ[#]} &]
does not work. How can I modify your suggestion in order to eliminate the non-numerical couple {3,ComplexInfinity}
from the list (avoiding Transpose etc..)?
Rob.
-----Messaggio originale-----
Da: Alexei Boulbitch [mailto:Alexei.Boulbitch at iee.lu]
Inviato: marted=EC 17 settembre 2013 09:09
A: mathgroup at smc.vnet.net
Cc: Brambilla Roberto Luigi (RSE)
Oggetto: Re: ReplacePart -> eliminate
I'd like to eliminate the Indeterminate (or other non-numerical terms, as Infinite, etc...) items. Es.
x = {-1.25664, 0.628319, -0.628319, 1.25664, Indeterminate, -1.25664,
0.628319, -0.628319, 1.25664, Indeterminate};
or
x=Table[1/(3 - n), {n, 0, 5}])
{1/3, 1/2, 1, ComplexInfinity, -1,-1/2}
How can I do it with a simple command?
Many thanks, Roberto
Hi, Roberto,
Try this:
x = {-1.25664, 0.628319, -0.628319, 1.25664, Indeterminate, -1.25664,
0.628319, -0.628319, 1.25664, Indeterminate}; y = Table[1/(3 - n), {n, 0, 5}];
Select[x, NumberQ[#] &]
Select[y, NumberQ[#] &]
{-1.25664, 0.628319, -0.628319, 1.25664, -1.25664, 0.628319, \ -0.628319, 1.25664}
{1/3, 1/2, 1, -1, -(1/2)}
Have fun, Alexei
Alexei BOULBITCH, Dr., habil.
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- References:
- R: ReplacePart -> eliminate
- From: "Brambilla Roberto Luigi (RSE)" <Roberto.Brambilla@rse-web.it>
- R: ReplacePart -> eliminate