我想计算对称矩阵的特征向量。 xcode上的模拟器给出了正确的答案，但ipad却没有。那个怎么样？我使用dsyevd_来获取它们。特征值是相同的，但特征向量并不完全相同，它们的结果如下所示。
逐列
模拟器：
-0.009208 -0.404135 -0.210490 -0.312938 0.319550 -0.054404 0.737996 0.211291
0.169398 0.066748 0.379263 -0.370896 -0.250928 -0.437742 -0.118876 0.645547
0.110466 0.209999 0.326172 0.103889 0.123889 0.783749 0.136729 0.422151
-0.104180 -0.116803 -0.608893 -0.361196 -0.518578 0.358588 -0.196926 0.194939
0.378676 0.302345 -0.023872 -0.680679 0.387809 0.109714 -0.193866 -0.318246
-0.084033 0.817684 -0.351129 0.104907 -0.057308 -0.193755 0.367770 0.118133
-0.418374 0.003169 -0.263900 0.056836 0.620621 -0.077634 -0.444729 0.403855
0.789095 -0.120198 -0.375779 0.381694 0.108631 -0.083484 -0.114602 0.209948
ipad设备：
-0.188080 -0.329016 -0.541892 0.066310 0.206281 -0.231312 0.263823 -0.626635
-0.043405 0.132373 -0.026365 0.363429 0.238327 0.861865 0.117671 -0.185366
-0.061033 0.293438 0.013891 0.331374 -0.284734 -0.111909 -0.702862 -0.461036
-0.104180 -0.116803 -0.608893 -0.361196 -0.518578 0.358588 -0.196926 0.194939
0.378676 0.302345 -0.023872 -0.680679 0.387809 0.109714 -0.193866 -0.318246
-0.084033 0.817684 -0.351129 0.104907 -0.057308 -0.193755 0.367770 0.118133
-0.418374 0.003169 -0.263900 0.056836 0.620621 -0.077634 -0.444729 0.403855
0.789095 -0.120198 -0.375779 0.381694 0.108631 -0.083484 -0.114602 0.209948
前三个元素完全不同，但其他五个元素完全相同。谁能帮助我？我试图弄清楚很多天。非常感谢你。
使用dsyevd _
添加计算特征向量的代码__CLPK_integer n = N, lda = LDA, info, lwork, liwork, iwkopt;
__CLPK_integer* iwork;
double wkopt;
double* work;
double s[N];
printf( " DSYEVD Example Program Results\n" );
lwork = -1;
liwork = -1;
dsyevd_( "Vectors", "U", &n, v, &lda, s, &wkopt, &lwork, &iwkopt, &liwork, &info );
lwork = (int)wkopt;
work = (double*)malloc( lwork*sizeof(double) );
liwork = iwkopt;
iwork = (__CLPK_integer*)malloc( liwork*sizeof(int) );
dsyevd_( "Vectors", "U", &n, v, &lda, s, work, &lwork, iwork, &liwork, &info );
if( info > 0 ) {
printf( "The algorithm failed to compute eigenvalues.\n" );
exit( 1 );
}