WHEREINVEC Function

WHEREINVEC Function

Finds the vectors in a matrix that occur in a second matrix.

Usage

i = WHEREINVEC(b, c)

Input Parameters

b — (m,n) array.

c — (p,n) array.

Returned Value

i — Array of all indices j such that b(j,*) = c(k,*) for some k.

Keywords

note	For numerical data, a more efficient algorithm is used if keywords k and ck are not set.

k — (output) Array of all indices j such that c(j,*) = b(q,*) for some q.

ci — (output) The complement of i: array of all indices j such that b(j,*) ≠ c(k,*) for any k.

ck — (output) The complement of k: array of all indices j such that c(j,*) ≠ b(q,*) for any q.

bc — (output) Matrix of rows of b which are in c, i.e., b(i,*). This keyword is ignored if keyword k or ck is set.

zo — (output) An m-element array of 0's and 1's, where 1's indicate the rows of b which are in c. This keyword is ignored if k or ck is set.

note	A scalar -1 is returned if an output array would have no elements.

Example

b = RANDOMU(s,9,4)

c = RANDOMU(s,6,4)

c(0,*) = b(8,*)

c(2,*) = b(8,*)

c(5,*) = b(1,*)

i = WHEREINVEC( b, c, k=k, ci=ci, ck=ck )

PM, i, ' ', k, ' ', ci, ' ', ck