ctpsv.f.html
来自「famous linear algebra library (LAPACK) p」· HTML 代码 · 共 354 行 · 第 1/2 页
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354 行
</span><span class="comment">*</span><span class="comment">
</span> IF (<a name="LSAME.160"></a><a href="lsame.f.html#LSAME.1">LSAME</a>(TRANS,<span class="string">'N'</span>)) THEN
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment"> Form x := inv( A )*x.
</span><span class="comment">*</span><span class="comment">
</span> IF (<a name="LSAME.164"></a><a href="lsame.f.html#LSAME.1">LSAME</a>(UPLO,<span class="string">'U'</span>)) THEN
KK = (N* (N+1))/2
IF (INCX.EQ.1) THEN
DO 20 J = N,1,-1
IF (X(J).NE.ZERO) THEN
IF (NOUNIT) X(J) = X(J)/AP(KK)
TEMP = X(J)
K = KK - 1
DO 10 I = J - 1,1,-1
X(I) = X(I) - TEMP*AP(K)
K = K - 1
10 CONTINUE
END IF
KK = KK - J
20 CONTINUE
ELSE
JX = KX + (N-1)*INCX
DO 40 J = N,1,-1
IF (X(JX).NE.ZERO) THEN
IF (NOUNIT) X(JX) = X(JX)/AP(KK)
TEMP = X(JX)
IX = JX
DO 30 K = KK - 1,KK - J + 1,-1
IX = IX - INCX
X(IX) = X(IX) - TEMP*AP(K)
30 CONTINUE
END IF
JX = JX - INCX
KK = KK - J
40 CONTINUE
END IF
ELSE
KK = 1
IF (INCX.EQ.1) THEN
DO 60 J = 1,N
IF (X(J).NE.ZERO) THEN
IF (NOUNIT) X(J) = X(J)/AP(KK)
TEMP = X(J)
K = KK + 1
DO 50 I = J + 1,N
X(I) = X(I) - TEMP*AP(K)
K = K + 1
50 CONTINUE
END IF
KK = KK + (N-J+1)
60 CONTINUE
ELSE
JX = KX
DO 80 J = 1,N
IF (X(JX).NE.ZERO) THEN
IF (NOUNIT) X(JX) = X(JX)/AP(KK)
TEMP = X(JX)
IX = JX
DO 70 K = KK + 1,KK + N - J
IX = IX + INCX
X(IX) = X(IX) - TEMP*AP(K)
70 CONTINUE
END IF
JX = JX + INCX
KK = KK + (N-J+1)
80 CONTINUE
END IF
END IF
ELSE
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment"> Form x := inv( A' )*x or x := inv( conjg( A' ) )*x.
</span><span class="comment">*</span><span class="comment">
</span> IF (<a name="LSAME.231"></a><a href="lsame.f.html#LSAME.1">LSAME</a>(UPLO,<span class="string">'U'</span>)) THEN
KK = 1
IF (INCX.EQ.1) THEN
DO 110 J = 1,N
TEMP = X(J)
K = KK
IF (NOCONJ) THEN
DO 90 I = 1,J - 1
TEMP = TEMP - AP(K)*X(I)
K = K + 1
90 CONTINUE
IF (NOUNIT) TEMP = TEMP/AP(KK+J-1)
ELSE
DO 100 I = 1,J - 1
TEMP = TEMP - CONJG(AP(K))*X(I)
K = K + 1
100 CONTINUE
IF (NOUNIT) TEMP = TEMP/CONJG(AP(KK+J-1))
END IF
X(J) = TEMP
KK = KK + J
110 CONTINUE
ELSE
JX = KX
DO 140 J = 1,N
TEMP = X(JX)
IX = KX
IF (NOCONJ) THEN
DO 120 K = KK,KK + J - 2
TEMP = TEMP - AP(K)*X(IX)
IX = IX + INCX
120 CONTINUE
IF (NOUNIT) TEMP = TEMP/AP(KK+J-1)
ELSE
DO 130 K = KK,KK + J - 2
TEMP = TEMP - CONJG(AP(K))*X(IX)
IX = IX + INCX
130 CONTINUE
IF (NOUNIT) TEMP = TEMP/CONJG(AP(KK+J-1))
END IF
X(JX) = TEMP
JX = JX + INCX
KK = KK + J
140 CONTINUE
END IF
ELSE
KK = (N* (N+1))/2
IF (INCX.EQ.1) THEN
DO 170 J = N,1,-1
TEMP = X(J)
K = KK
IF (NOCONJ) THEN
DO 150 I = N,J + 1,-1
TEMP = TEMP - AP(K)*X(I)
K = K - 1
150 CONTINUE
IF (NOUNIT) TEMP = TEMP/AP(KK-N+J)
ELSE
DO 160 I = N,J + 1,-1
TEMP = TEMP - CONJG(AP(K))*X(I)
K = K - 1
160 CONTINUE
IF (NOUNIT) TEMP = TEMP/CONJG(AP(KK-N+J))
END IF
X(J) = TEMP
KK = KK - (N-J+1)
170 CONTINUE
ELSE
KX = KX + (N-1)*INCX
JX = KX
DO 200 J = N,1,-1
TEMP = X(JX)
IX = KX
IF (NOCONJ) THEN
DO 180 K = KK,KK - (N- (J+1)),-1
TEMP = TEMP - AP(K)*X(IX)
IX = IX - INCX
180 CONTINUE
IF (NOUNIT) TEMP = TEMP/AP(KK-N+J)
ELSE
DO 190 K = KK,KK - (N- (J+1)),-1
TEMP = TEMP - CONJG(AP(K))*X(IX)
IX = IX - INCX
190 CONTINUE
IF (NOUNIT) TEMP = TEMP/CONJG(AP(KK-N+J))
END IF
X(JX) = TEMP
JX = JX - INCX
KK = KK - (N-J+1)
200 CONTINUE
END IF
END IF
END IF
<span class="comment">*</span><span class="comment">
</span> RETURN
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment"> End of <a name="CTPSV.327"></a><a href="ctpsv.f.html#CTPSV.1">CTPSV</a> .
</span><span class="comment">*</span><span class="comment">
</span> END
</pre>
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