# Category : Miscellaneous Language Source Code

Archive : FORTRN77.ZIP

Filename : STPLRG.FOR

C

C THIS SUBROUTINE WILL FOR A POLYNOMIAL OF DEGREE N

C TO M OBSERVATIONS, BY THE METHOD OF LEAST SQUARES.

C

DIMENSION X(1), Y(1), A(1), C(1)

N1 = N + 1

N2 = N1 + 1

NNPN = N*N1

N1PN1 = N1 + N1

N1N1 = NNPN + N1

C CLEAR 1ST ROW AND LAST TWO COLUMNS

I1J = 1

DO 30 J = 1,N

A(I1J) = 0.0

30 I1J = I1J + N1

L = NNPN + 1

DO 40 J = 1 + N1PN1

A(L) = 0.0

40 L = L + 1

C COMPUTE SUMS OF POWERS

DO 10 K = 1,M

XPWR = X(K)

I1J = N1 + 1

DO 20 J = 2,N1

JNP2 = N1N1 + J

A(I1J) = A(I1J) + XPWR

A(JNP2) = A(JNP2) + XPWR*Y(K)

XPWR = XPWR*X(K)

20 I1J = I1J + N1

DO 50 I = 2,N1

IN1 = NNPN + I

A(IN1) = A(IN1) + XPWR

50 XPWR = XPWR*X(K)

10 A(N1N1 + 1) = A(N1N1 + 1) + Y(K)

C FILL IN REST OF MATRIX A

A(1) = M

DO 60 I = 2,N1

IJ = I

DO 60 J = 1,N

IM1JP1 = IJ + N

A(IJ) = A(IM1JP1)

60 IJ = IJ + N1

C SOLVE EQUATIONS FOR COEFFICIENTS

NC = -N2

CALL MATINV(IFLAG,IFLAG,N1,NC,A,N1,I,XPWR)

K = N1N1 + N1

DO 70 I = 1,N1

C(I) = A(K)

70 K = K - 1

RETURN

END

Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!

This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.

But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: http://www.os2museum.com/wp/mtswslnk/