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Repating a vector in a vector form

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Contributor
Posts: 38

Repating a vector in a vector form

Hi,

If I have a vector

v = [i

j

k]

I want to repeat a vector in a vector format couple of times:

v=[i

j

k

i

j

k

i

j

k

]

Actually I would like to use this in reshaping a matrix to a vector. but I want to add a column by the variable name as the first two columns:

z = [

1 2 3

4 5 6

7 8 9]

rowname = [ a b c]

calname = [i j k]

I am using Z = shape(Z, ncol*nrow, 1);

I want to create a table looks like:

a i 1

a j 2

a k 3

b i 4

b j 5

b k 6

c i 7

c j 8

c k 9

Thank you

SAS Super FREQ
Posts: 3,633

Re: Repating a vector in a vector form

You want to use the REPEAT function, as discussed in the Getting Started chapter of my book.

Several examples are here: http://blogs.sas.com/content/iml/2012/06/27/create-an-id-vector-for-repeated-measurements/

For the first two columns, you should read about the very useful Define2DGrid function, which wraps up some of the REPEAT and SHAPE functionality: http://blogs.sas.com/content/iml/2011/01/21/how-to-create-a-grid-of-values/

You can use that function to generate the indices for the first two columns:

ij = Define2DGrid(1, 3, 3, 1, 3, 3);

i = ij[,1];  j = ij[,2];

rname={a b c};

cname = {i j k};

c1 = rname;

c2 = cname;

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