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本帖最后由 呆萌萱 于 2016-4-28 07:32 编辑
我用魏凤英老师的fortran程序计算线性倾向估计
spring600.txt
272.9870
272.9634
272.9492
272.9411
272.9330
272.9222
272.9073
272.8877
272.8614
272.8297
272.7959
272.7628
272.7351
272.7155
272.7054
272.7007
272.6993
272.6986
272.7027
272.7101
272.7195
272.7297
272.7371
272.7419
272.7473
272.7594
272.7776
272.8019
272.8229
272.8384
272.8472
272.8560
272.8708
272.8951
272.9269
272.9607
year.txt 1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
程序如下
C THIS IS A PROGRAM OF LINEAR REGRESSION BETWEEN
C X AND T(TIME OR YEAR),i.e. X=A+BT
C PROGRAM LR
PARAMETER (N=34)!常数声明
DIMENSION X(N),IT(N),RX(N)!定义数组
REAL A,B,R
C ***************************************************
C * N: SAMPLE SIZE *
C * X: ARRAY OF X *
C * IT: ARRAY OF YEAR *
C ***************************************************
OPEN(2,FILE='spring600.TXT')
READ(2,*)(X(I),I=1,N)
OPEN(3,FILE='year.TXT')
READ(3,*)(IT(I),I=1,N)
CALL SLR(N,X,IT,RX,A,B,R)
OPEN(6,FILE='LR600.TXT',STATUS='NEW')
WRITE(6,10)
10 FORMAT(20X,'LINEAR TREND ANALYSIS'/)
WRITE(6,20)A,B,R
20 FORMAT(5X,'CONSTANT OF REGRESSION A=',F10.4/
& 5X,'COEFFICIENT OF REGRESSION B=',F10.4/
& 5X,'CORRELATION COEFFICIENT R=',F10.4/5X,'--------------------')
DO 30 I=1,N
WRITE(6,40)IT(I),X(I),RX(I)
40 FORMAT(I6,F7.2,F7.2)
30 CONTINUE
STOP
END
C********************************************************************
SUBROUTINE SLR(N,X,IT,RX,A,B,R)
DIMENSION X(N),IT(N),RX(N)
REAL A,B,R
CX=0.0
CT=0.0
CXC=0.0
CTC=0.0
CXT=0.0
DO 10 I=1,N
CX=CX+X(I)
CT=CT+IT(I)
CXC=CXC+X(I)*X(I)
CTC=CTC+IT(I)*IT(I)
10 CXT=CXT+X(I)*IT(I)
DX=CXC-CX*CX/FLOAT(N)!FLOAT强制转换成浮点
DT=CTC-CT*CT/FLOAT(N)
DXT=CXT-CX*CT/FLOAT(N)
B=DXT/DT
A=CX/FLOAT(N)-B*CT/FLOAT(N)
R=DXT/SQRT(DX*DT)
DO 20 I=1,N
20 RX(I)=A+B*IT(I)
RETURN
END
C ---------------------END-------------------------------------
但是运行出来的错误如图所示,这是什么问题啊?
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