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Matrix Manipulation based on index

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Mark Cejas
Mark Cejas 2013-8-23
Hi all,
I would appreciate assistance to do the following:
I have the following vector
v=[1
1
2
3
3
3
3
3
3
4
4
4
4
]'
each number of this vector is an index value that repeats a certain number of times, or not at all. I would like to use as a recipe to modify the following matrix M. The matrix M contains unique rows that pertain to a particular index value in the vector v as such:
M=
1 0.0127 5.0127
2 0.00266 5.00266
3 0.00263 5.00263
4 0.00266 5.00266
I would like to use the sequence of unique indices in v as a recipe to repeat the rows in the matrix M and produce the following matrix P:
P=
1 0.0127 5.0127
1 0.0127 5.0127
2 0.00266 5.00266
3 0.00263 5.00263
3 0.00263 5.00263
3 0.00263 5.00263
3 0.00263 5.00263
3 0.00263 5.00263
3 0.00263 5.00263
4 0.00272 5.00272
4 0.0129 5.0129
4 0.0129 5.0129
4 0.0129 5.0129
Notice the rows of matrix P are repeated in the exact sequence as listed in the index vector v.
I would greatly appreciate any help.
thank you,
Mark

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2013-8-23
编辑：Azzi Abdelmalek 2013-8-23
P=M(v,:);

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