zher2k.f.html
来自「famous linear algebra library (LAPACK) p」· HTML 代码 · 共 393 行 · 第 1/2 页
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393 行
INFO = 2
ELSE IF (N.LT.0) THEN
INFO = 3
ELSE IF (K.LT.0) THEN
INFO = 4
ELSE IF (LDA.LT.MAX(1,NROWA)) THEN
INFO = 7
ELSE IF (LDB.LT.MAX(1,NROWA)) THEN
INFO = 9
ELSE IF (LDC.LT.MAX(1,N)) THEN
INFO = 12
END IF
IF (INFO.NE.0) THEN
CALL <a name="XERBLA.192"></a><a href="xerbla.f.html#XERBLA.1">XERBLA</a>(<span class="string">'<a name="ZHER2K.192"></a><a href="zher2k.f.html#ZHER2K.1">ZHER2K</a>'</span>,INFO)
RETURN
END IF
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment"> Quick return if possible.
</span><span class="comment">*</span><span class="comment">
</span> IF ((N.EQ.0) .OR. (((ALPHA.EQ.ZERO).OR.
+ (K.EQ.0)).AND. (BETA.EQ.ONE))) RETURN
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment"> And when alpha.eq.zero.
</span><span class="comment">*</span><span class="comment">
</span> IF (ALPHA.EQ.ZERO) THEN
IF (UPPER) THEN
IF (BETA.EQ.DBLE(ZERO)) THEN
DO 20 J = 1,N
DO 10 I = 1,J
C(I,J) = ZERO
10 CONTINUE
20 CONTINUE
ELSE
DO 40 J = 1,N
DO 30 I = 1,J - 1
C(I,J) = BETA*C(I,J)
30 CONTINUE
C(J,J) = BETA*DBLE(C(J,J))
40 CONTINUE
END IF
ELSE
IF (BETA.EQ.DBLE(ZERO)) THEN
DO 60 J = 1,N
DO 50 I = J,N
C(I,J) = ZERO
50 CONTINUE
60 CONTINUE
ELSE
DO 80 J = 1,N
C(J,J) = BETA*DBLE(C(J,J))
DO 70 I = J + 1,N
C(I,J) = BETA*C(I,J)
70 CONTINUE
80 CONTINUE
END IF
END IF
RETURN
END IF
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment"> Start the operations.
</span><span class="comment">*</span><span class="comment">
</span> IF (<a name="LSAME.240"></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 C := alpha*A*conjg( B' ) + conjg( alpha )*B*conjg( A' ) +
</span><span class="comment">*</span><span class="comment"> C.
</span><span class="comment">*</span><span class="comment">
</span> IF (UPPER) THEN
DO 130 J = 1,N
IF (BETA.EQ.DBLE(ZERO)) THEN
DO 90 I = 1,J
C(I,J) = ZERO
90 CONTINUE
ELSE IF (BETA.NE.ONE) THEN
DO 100 I = 1,J - 1
C(I,J) = BETA*C(I,J)
100 CONTINUE
C(J,J) = BETA*DBLE(C(J,J))
ELSE
C(J,J) = DBLE(C(J,J))
END IF
DO 120 L = 1,K
IF ((A(J,L).NE.ZERO) .OR. (B(J,L).NE.ZERO)) THEN
TEMP1 = ALPHA*DCONJG(B(J,L))
TEMP2 = DCONJG(ALPHA*A(J,L))
DO 110 I = 1,J - 1
C(I,J) = C(I,J) + A(I,L)*TEMP1 +
+ B(I,L)*TEMP2
110 CONTINUE
C(J,J) = DBLE(C(J,J)) +
+ DBLE(A(J,L)*TEMP1+B(J,L)*TEMP2)
END IF
120 CONTINUE
130 CONTINUE
ELSE
DO 180 J = 1,N
IF (BETA.EQ.DBLE(ZERO)) THEN
DO 140 I = J,N
C(I,J) = ZERO
140 CONTINUE
ELSE IF (BETA.NE.ONE) THEN
DO 150 I = J + 1,N
C(I,J) = BETA*C(I,J)
150 CONTINUE
C(J,J) = BETA*DBLE(C(J,J))
ELSE
C(J,J) = DBLE(C(J,J))
END IF
DO 170 L = 1,K
IF ((A(J,L).NE.ZERO) .OR. (B(J,L).NE.ZERO)) THEN
TEMP1 = ALPHA*DCONJG(B(J,L))
TEMP2 = DCONJG(ALPHA*A(J,L))
DO 160 I = J + 1,N
C(I,J) = C(I,J) + A(I,L)*TEMP1 +
+ B(I,L)*TEMP2
160 CONTINUE
C(J,J) = DBLE(C(J,J)) +
+ DBLE(A(J,L)*TEMP1+B(J,L)*TEMP2)
END IF
170 CONTINUE
180 CONTINUE
END IF
ELSE
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment"> Form C := alpha*conjg( A' )*B + conjg( alpha )*conjg( B' )*A +
</span><span class="comment">*</span><span class="comment"> C.
</span><span class="comment">*</span><span class="comment">
</span> IF (UPPER) THEN
DO 210 J = 1,N
DO 200 I = 1,J
TEMP1 = ZERO
TEMP2 = ZERO
DO 190 L = 1,K
TEMP1 = TEMP1 + DCONJG(A(L,I))*B(L,J)
TEMP2 = TEMP2 + DCONJG(B(L,I))*A(L,J)
190 CONTINUE
IF (I.EQ.J) THEN
IF (BETA.EQ.DBLE(ZERO)) THEN
C(J,J) = DBLE(ALPHA*TEMP1+
+ DCONJG(ALPHA)*TEMP2)
ELSE
C(J,J) = BETA*DBLE(C(J,J)) +
+ DBLE(ALPHA*TEMP1+
+ DCONJG(ALPHA)*TEMP2)
END IF
ELSE
IF (BETA.EQ.DBLE(ZERO)) THEN
C(I,J) = ALPHA*TEMP1 + DCONJG(ALPHA)*TEMP2
ELSE
C(I,J) = BETA*C(I,J) + ALPHA*TEMP1 +
+ DCONJG(ALPHA)*TEMP2
END IF
END IF
200 CONTINUE
210 CONTINUE
ELSE
DO 240 J = 1,N
DO 230 I = J,N
TEMP1 = ZERO
TEMP2 = ZERO
DO 220 L = 1,K
TEMP1 = TEMP1 + DCONJG(A(L,I))*B(L,J)
TEMP2 = TEMP2 + DCONJG(B(L,I))*A(L,J)
220 CONTINUE
IF (I.EQ.J) THEN
IF (BETA.EQ.DBLE(ZERO)) THEN
C(J,J) = DBLE(ALPHA*TEMP1+
+ DCONJG(ALPHA)*TEMP2)
ELSE
C(J,J) = BETA*DBLE(C(J,J)) +
+ DBLE(ALPHA*TEMP1+
+ DCONJG(ALPHA)*TEMP2)
END IF
ELSE
IF (BETA.EQ.DBLE(ZERO)) THEN
C(I,J) = ALPHA*TEMP1 + DCONJG(ALPHA)*TEMP2
ELSE
C(I,J) = BETA*C(I,J) + ALPHA*TEMP1 +
+ DCONJG(ALPHA)*TEMP2
END IF
END IF
230 CONTINUE
240 CONTINUE
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="ZHER2K.366"></a><a href="zher2k.f.html#ZHER2K.1">ZHER2K</a>.
</span><span class="comment">*</span><span class="comment">
</span> END
</pre>
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