    dd(i, k) = dd(i, k) &amp;
<a name="l00386"></a>00386                     + sqrt_tbl(j-i) * sqrt_tbl(j-k) * dlj * coshb
<a name="l00387"></a>00387                dd(i + 1, k) = dd(i + 1, k) &amp;
<a name="l00388"></a>00388                     - sqrt_tbl(i+1) * sqrt_tbl(j-k) * dlj * sinhb
<a name="l00389"></a>00389                dd(i, k + 1) = dd(i, k + 1) &amp;
<a name="l00390"></a>00390                     + sqrt_tbl(j-i) * sqrt_tbl(k+1) * dlj * sinhb
<a name="l00391"></a>00391                dd(i + 1,