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Date: Mon, 12 Apr 2010 22:40:00 +0200
Message-ID: <p2sc9ae4b791004121340y53f03353o50d08c6feb5a659c@mail.gmail.com>
Subject: Re: Two dimensional matrices
From: Philippe <watcherfr@gmail.com>
To: user@cassandra.apache.org
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Eric, Dop,
Thanks for your answers.

If I understand what you're asking, a rectangle (identified by X and Y
> coordinates for a time-frame), will boil down to a single column. There
> are certainly no problems with retrieving a single sub-column from a
> super column.
>
I realize I wasn't clear enough. Getting cell {x,y} is easy, I understand
that.
I am interested in getting a slice of that grid : all cells {x,y} where

   - x_min<=x<=x_max
   - y_min<=y<=y_max

My understanding from the docs is that get_range_slices would do it but I
would like confirmation.
In fact, I believe this is the same question as Dop Sun is asking.


> > Will the result associate each value with its key and column ?
> The result will be a column that contains the binary value, which you
> obtained by using key, column family, and super column name. So, yes.
>
What about this new case ?

Philippe

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<div><div class=3D"gmail_quote"><div>Eric, Dop,</div><div>Thanks for your a=
nswers.=A0</div><div><br></div><blockquote class=3D"gmail_quote" style=3D"m=
argin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">If I underst=
and what you&#39;re asking, a rectangle (identified by X and Y<br>

coordinates for a time-frame), will boil down to a single column. There<br>
are certainly no problems with retrieving a single sub-column from a<br>
super column.<br></blockquote><div>I realize I wasn&#39;t clear enough. Get=
ting cell {x,y} is easy, I understand that.</div><div>I am interested in ge=
tting a slice of that grid : all cells {x,y} where=A0</div><div><ul><li>
x_min&lt;=3Dx&lt;=3Dx_max</li><li>y_min&lt;=3Dy&lt;=3Dy_max</li></ul><div>M=
y understanding from the docs is that get_range_slices would do it but I wo=
uld like confirmation.</div><div>In fact, I believe this is the same questi=
on as Dop Sun is asking.</div>
<div><br></div><div><br></div></div><blockquote class=3D"gmail_quote" style=
=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div class=3D"im"><br>
&gt; Will the result associate each value with its key and column ?<br>
</div>The result will be a column that contains the binary value, which you=
<br>
obtained by using key, column family, and super column name. So, yes.<br></=
blockquote><div>What about this new case ?</div><div><br></div><div>Philipp=
e</div></div></div>

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