Repatch (from linux) of OSX IRAF

1 files changed, 107 insertions, 0 deletions

diff --git a/math/ieee/chap1/r8tx.f b/math/ieee/chap1/r8tx.f
new file mode 100644
index 00000000..9cc4f591
--- /dev/null
+++ b/math/ieee/chap1/r8tx.f
@@ -0,0 +1,107 @@
+c
+c-----------------------------------------------------------------------
+c subroutine:  r8tx
+c radix 8 iteration subroutine
+c-----------------------------------------------------------------------
+c
+      subroutine r8tx(nxtlt, nthpo, lengt, cr0, cr1, cr2, cr3, cr4,
+     *    cr5, cr6, cr7, ci0, ci1, ci2, ci3, ci4, ci5, ci6, ci7)
+      dimension cr0(2), cr1(2), cr2(2), cr3(2), cr4(2), cr5(2), cr6(2),
+     *    cr7(2), ci1(2), ci2(2), ci3(2), ci4(2), ci5(2), ci6(2),
+     *    ci7(2), ci0(2)
+      common /con2/ pi2, p7
+c
+      scale = pi2/float(lengt)
+      do 30 j=1,nxtlt
+        arg = float(j-1)*scale
+        c1 = cos(arg)
+        s1 = sin(arg)
+        c2 = c1**2 - s1**2
+        s2 = c1*s1 + c1*s1
+        c3 = c1*c2 - s1*s2
+        s3 = c2*s1 + s2*c1
+        c4 = c2**2 - s2**2
+        s4 = c2*s2 + c2*s2
+        c5 = c2*c3 - s2*s3
+        s5 = c3*s2 + s3*c2
+        c6 = c3**2 - s3**2
+        s6 = c3*s3 + c3*s3
+        c7 = c3*c4 - s3*s4
+        s7 = c4*s3 + s4*c3
+        do 20 k=j,nthpo,lengt
+          ar0 = cr0(k) + cr4(k)
+          ar1 = cr1(k) + cr5(k)
+          ar2 = cr2(k) + cr6(k)
+          ar3 = cr3(k) + cr7(k)
+          ar4 = cr0(k) - cr4(k)
+          ar5 = cr1(k) - cr5(k)
+          ar6 = cr2(k) - cr6(k)
+          ar7 = cr3(k) - cr7(k)
+          ai0 = ci0(k) + ci4(k)
+          ai1 = ci1(k) + ci5(k)
+          ai2 = ci2(k) + ci6(k)
+          ai3 = ci3(k) + ci7(k)
+          ai4 = ci0(k) - ci4(k)
+          ai5 = ci1(k) - ci5(k)
+          ai6 = ci2(k) - ci6(k)
+          ai7 = ci3(k) - ci7(k)
+          br0 = ar0 + ar2
+          br1 = ar1 + ar3
+          br2 = ar0 - ar2
+          br3 = ar1 - ar3
+          br4 = ar4 - ai6
+          br5 = ar5 - ai7
+          br6 = ar4 + ai6
+          br7 = ar5 + ai7
+          bi0 = ai0 + ai2
+          bi1 = ai1 + ai3
+          bi2 = ai0 - ai2
+          bi3 = ai1 - ai3
+          bi4 = ai4 + ar6
+          bi5 = ai5 + ar7
+          bi6 = ai4 - ar6
+          bi7 = ai5 - ar7
+          cr0(k) = br0 + br1
+          ci0(k) = bi0 + bi1
+          if (j.le.1) go to 10
+          cr1(k) = c4*(br0-br1) - s4*(bi0-bi1)
+          ci1(k) = c4*(bi0-bi1) + s4*(br0-br1)
+          cr2(k) = c2*(br2-bi3) - s2*(bi2+br3)
+          ci2(k) = c2*(bi2+br3) + s2*(br2-bi3)
+          cr3(k) = c6*(br2+bi3) - s6*(bi2-br3)
+          ci3(k) = c6*(bi2-br3) + s6*(br2+bi3)
+          tr = p7*(br5-bi5)
+          ti = p7*(br5+bi5)
+          cr4(k) = c1*(br4+tr) - s1*(bi4+ti)
+          ci4(k) = c1*(bi4+ti) + s1*(br4+tr)
+          cr5(k) = c5*(br4-tr) - s5*(bi4-ti)
+          ci5(k) = c5*(bi4-ti) + s5*(br4-tr)
+          tr = -p7*(br7+bi7)
+          ti = p7*(br7-bi7)
+          cr6(k) = c3*(br6+tr) - s3*(bi6+ti)
+          ci6(k) = c3*(bi6+ti) + s3*(br6+tr)
+          cr7(k) = c7*(br6-tr) - s7*(bi6-ti)
+          ci7(k) = c7*(bi6-ti) + s7*(br6-tr)
+          go to 20
+  10      cr1(k) = br0 - br1
+          ci1(k) = bi0 - bi1
+          cr2(k) = br2 - bi3
+          ci2(k) = bi2 + br3
+          cr3(k) = br2 + bi3
+          ci3(k) = bi2 - br3
+          tr = p7*(br5-bi5)
+          ti = p7*(br5+bi5)
+          cr4(k) = br4 + tr
+          ci4(k) = bi4 + ti
+          cr5(k) = br4 - tr
+          ci5(k) = bi4 - ti
+          tr = -p7*(br7+bi7)
+          ti = p7*(br7-bi7)
+          cr6(k) = br6 + tr
+          ci6(k) = bi6 + ti
+          cr7(k) = br6 - tr
+          ci7(k) = bi6 - ti
+  20    continue
+  30  continue
+      return
+      end