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Returning start/end indices

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# 1  
Old 01-13-2011
Returning start/end indices
I have an array of distances and a len, for example

Code:
len = 323
dist = [187 243 323 476 500 670 734 862]

I want to calculate the start and end index values around each distance in the array with a length of len from it. Values in dist are stored in ascending order.
# 2  
Old 01-13-2011
What language?
# 3  
Old 01-13-2011
C will do

---------- Post updated at 08:07 AM ---------- Previous update was at 07:31 AM ----------

Have created a subroutine in fortran doing something like this.

Code:
    SUBROUTINE SWNA3D_IDXWIN(IVA, IVB, V, WLEN, N)
    IMPLICIT NONE
    INTEGER    N
    REAL    V(N)
    INTEGER    IVA(N)
    INTEGER    IVB(N)
    REAL    WLEN
C
    REAL, ALLOCATABLE :: VA(:)
    REAL, ALLOCATABLE :: VB(:)
    INTEGER I
    LOGICAL    L_ASCENDING
C
    ALLOCATE(VA(:))
    ALLOCATE(VB(:))
C
    L_ASCENDING = .TRUE.
    DO I = 1, N-1
      IF (V(I) > V(I+1)) THEN
        L_ASCENDING = .FALSE.
        EXIT
      ENDIF
    ENDDO
    IF (L_ASCENDING == .FALSE.) PRINT *, 'V not ascending order'
C
    DO I = 1, N
      VA(I) = V(i) - (WLEN/2.0)
      VB(I) = V(i) + (WLEN/2.0)
C
      J = 1
      ISTART = 0
      DO WHILE ((V(J) < VA(I)).AND.(J <= N))
        ISTART = ISTART + 1
        J = J + 1
      END DO
      ISTART = ISTART + 1
C
      J = 1
      IEND = 0
      DO WHILE ((V(J) <= VA(I)).AND.(J <= N))
        IEND = IEND + 1
        J = J + 1
      END DO

    ENDDO

    RETURN
    END SUBROUTINE SWNA3D_IDXWIN

Last edited by kristinu; 01-13-2011 at 10:46 AM..
# 4  
Old 01-13-2011
For the values you provided post #1, what is the expected output?
# 5  
Old 01-13-2011
Here is an example

Code:
vlen = 10;
lwin = 250;
v = [187 243 323 476 500 670 734 862 912 1023];

for i = 1:vlen
  d(i,1) = v(i) - (lwin/2);
  d(i,2) = v(i) + (lwin/2);
end

This should give the following result

Code:
d =      62         312
         118         368
         198         448
         351         601
         375         625
         545         795
         609         859
         737         987
         787        1037
         898        1148

For the first set of values 62 and 312, the indices should be 1 and 2
For 118 and 368, indices should be 1 and 3
For 198 and 448, indices should be 2 and 4

and so on
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