Message-ID: <1295294707803-3221255.post@n4.nabble.com>
Date: 2011-01-17T20:05:07Z
From: Pete Brecknock
Subject: How to doulbe all the value on a matrix
In-Reply-To: <1295293767474-3221252.post@n4.nabble.com>
I believe you want to select a subset of rows and subset of columns of your
original matrix m.
If you had wanted only the first row of m, you could have used m[1,]
Alternatively, if you had wanted only the second column of m then you could
have used m[,2]
m[1,2] would give you the element at row 1, column 2.
You are requesting rows 2,7, and 8 and columns 1,4,6 and 7.
The syntax is m[required rows, required columns]
c() allows you to specify multiple rows/columns at the same time.
HTH
Pete
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