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zyj8119

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CODE:
PROGRAM main
REAL,DIMENSION(1:5,1:5)::a
REAL::det,determinate
a=reshape((/0.0,-3.0,-1.0,2.0,3.0,1.0,0.0,3.0,7.0,-2.0,3.0,&
-1.0,0.0,5.0,-5.0,2.0,6.0,-4.0,1.0,2.0,-2.0,5.0,0.0,&
-1.0,3.0/),(/5,5/))
det=determinate(a,5)
WRITE(*,'("Value of determinate A=",F8.2)')det
END PROGRAM main
!
FUNCTION determinate(a,n) RESULT(det)
INTEGER::n,rn,i,j,k,m
REAL::a(1:n,1:n),det,eps=1E-8
out:DO i=1,n-1
       rn=i
           IF(ABS(a(i,i)) in:        DO
           rn=rn+1
                   IF(rn>n)THEN
                   det=0.0;EXIT
                   ELSEIF(ABS(a(rn,i))>eps)THEN
                    DO m=i,n
           a(i,m)=a(i,m)+a(m,m)
                        END DO
                        EXIT in
                END IF
        END DO in
END IF
DO k=i+1,n
DO j=i+1,n
  a(k,j)=a(k,j)-a(i,j)*a(k,i)/a(i,i)
END DO
END DO
END DO out
det=1.0
DO i=1,n
det=det*a(i,i)
END DO
END FUNCTION determinate

[ Last edited by ÓàÔó³É on 2010-9-13 at 11:05 ]
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zyj8119(½ð±Ò+2):лл»ØÌû¡£ 2010-09-01 10:27:33
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sxf2012

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zyj8119(½ð±Ò+1):лл²ÎÓë
zyj8119(½ð±Ò+2):Êǵġ£ 2010-09-01 16:02:41
ÒýÓûØÌû:
Originally posted by zyj8119 at 2010-09-01 00:51:00:
[code]PROGRAM main
REAL,DIMENSION(1:5,1:5)::a
REAL::det,determinate
a=reshape((/0.0,-3.0,-1.0,2.0,3.0,1.0,0.0,3.0,7.0,-2.0,3.0,&
-1.0,0.0,5.0,-5.0,2.0,6.0,-4.0,1.0,2.0,-2.0,5.0,0.0,&
- ...

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3Â¥2010-09-01 11:06:28
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nono2009

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No gains, no pains.

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zyj8119(½ð±Ò+1):лл²ÎÓë
zyj8119(½ð±Ò+3):ʹµÃ£¬Êý×éÔ½½çµÄÎÊÌâºÜÍ·Í´¡£ 2010-09-01 16:02:30
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sxf2012

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nono2009(½ð±Ò+1):¹ÄÀøÓ¦Öú¡£ 2010-09-03 06:55:37
ÒýÓûØÌû:
Originally posted by sxf2012 at 2010-09-01 11:06:28:


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5Â¥2010-09-02 20:20:17
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zyj8119

ľ³æ (ÖøÃûдÊÖ)

ÒýÓûØÌû:
Originally posted by sxf2012 at 2010-09-02 20:20:17:


ÎÒÔËÐеÄʱºò£¬ÊdzöÏÖA = NAN£¬¸ÄÁ˸öAÖеÄÊý¾Ý£¬¾ÍËã³öÀ´Ò»¸öÊý£¬Ã»³öÏÖÊý×éÔ½½ç°¡~

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