sub-matrix block size
Tena koe Santosh It is not clear to me precisely what your blocking rules are (e.g., where should matrix[4,4] go, is matrix[5:7,5:7] to be considered as a different block to matrix[8:10,8:10]). Also, what happens if there is an isolated 1 (e.g., in location matrix[9,6])? However, I imagine something could be achieved with judicious use of diag() and rle(). HTH .... Peter Alspach
-----Original Message----- From: r-help-bounces at r-project.org [mailto:r-help-bounces at r- project.org] On Behalf Of Santosh Sent: Wednesday, 27 April 2011 12:14 p.m. To: r-help Subject: [R] sub-matrix block size Dear Rxperts Below is a small vector of values of zeros and non-zeros... was wondering if there is an efficient way to get the block sizes of submatrices of a big matrix similar to the one shown below? diagonal elements can be zero too. Rows with only a diagonal element may be considered as a unit block size. c(1,0,0,0,0,0,0,0,0,0,0, 1,1,0,0,0,0,0,0,0,0,0, 0,0,1,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,1,0,0,0,0,0,0, 0,0,0,0,1,1,0,0,0,0,0, 0,0,0,0,1,1,1,0,0,0,0, 0,0,0,0,0,0,0,1,0,0,0, 0,0,0,0,0,0,0,1,1,0,0, 0,0,0,0,0,0,0,1,1,1,0, 0,0,0,0,0,0,0,0,0,0,0) Thanks much! Santosh [[alternative HTML version deleted]]
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