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SUBMX.FOR
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1985-11-29
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63 lines
C
C ..................................................................
C
C SUBROUTINE SUBMX
C
C PURPOSE
C BASED ON VECTOR S DERIVED FROM SUBROUTINE SUBST OR ABSNT,
C THIS SUBROUTINE COPIES FROM A LARGER MATRIX OF OBSERVATION
C DATA A SUBSET MATRIX OF THOSE OBSERVATIONS WHICH HAVE
C SATISFIED CERTAIN CONDITION. THIS SUBROUTINE IS NORMALLY
C USED PRIOR TO STATISTICAL ANALYSES (E.G., MULTIPLE REGRES-
C SION, FACTOR ANALYSIS).
C
C USAGE
C CALL SUBMX (A,D,S,NO,NV,N)
C
C DESCRIPTION OF PARAMETERS
C A - INPUT MATRIX OF OBSERVATIONS, NO BY NV.
C D - OUTPUT MATRIX OF OBSERVATIONS, N BY NV.
C S - INPUT VECTOR OF LENGTH NO CONTAINING THE CODES DERIVED
C FROM SUBROUTINE SUBST OR ABSNT.
C NO - NUMBER OF OBSERVATIONS. NO MUST BE > OR = TO 1.
C NV - NUMBER OF VARIABLES. NV MUST BE > OR = TO 1.
C N - OUTPUT VARIABLE CONTAINING THE NUMBER OF NON-ZERO CODES
C IN VECTOR S.
C
C REMARKS
C MATRIX D CAN BE IN THE SAME LOCATION AS MATRIX A.
C
C SUBROUTINES AND FUNCTION SUBPROGRAMS REQUIRED
C NONE
C
C METHOD
C IF S(I) CONTAINS A NON-ZERO CODE, I-TH OBSERVATION IS
C COPIED FROM THE INPUT MATRIX TO THE OUTPUT MATRIX.
C
C ..................................................................
C
SUBROUTINE SUBMX (A,D,S,NO,NV,N)
DIMENSION A(1),D(1),S(1)
C
L=0
LL=0
DO 20 J=1,NV
DO 15 I=1,NO
L=L+1
IF(S(I)) 15, 15, 10
10 LL=LL+1
D(LL)=A(L)
15 CONTINUE
20 CONTINUE
C
C COUNT NON-ZERO CODES IN VECTOR S
C
N=0
DO 30 I=1,NO
IF(S(I)) 30, 30, 25
25 N=N+1
30 CONTINUE
C
RETURN
END