我正在写一个程序。该程序求解矩阵。矩阵与用户在命令行参数中指定的一样大。我希望程序解决非常大的矩阵，所以当我完成所有线性代数的东西，包括 umfpack、lapack、suitespares、arpack ......我试图通过删除未使用的数组来释放内存空间。我找到了 3 个完全未使用的数组，它们仅用于调试解决矩阵的其他问题。
当我从声明和分配中删除变量时，程序开始表现不同。矩阵解决方案现在是错误的。我已经回到我的备份文件，它仍然可以正常工作。我确信删除未使用数组的声明和分配会阻止我的程序找到正确的解决方案。
这几天我一直在玩弄这个问题。我真的无法想象删除未使用的数组会如何改变我的程序的执行。任何帮助表示赞赏。
program HHSolver
use MathOperations
integer :: O, NEV, i, j, k, a, col, row
integer :: coeff, p, b, NTerms, NextCoeff
integer :: m, n, symbolic, numeric
integer :: TermIndex, ido, NCV,LDV, LWorkL, info2,ierr
double precision :: x, y, sigmai, sigmar
Character(128) :: String, term, factor
character(1) :: bmat
character(2) :: which
double precision, dimension(:, :), allocatable :: polynomial !this stores the polynomial boundary equation
double precision, dimension(:, :), allocatable :: lap !this stores the polynomial boundary equation
double precision, dimension(:, :), allocatable :: temp !this stores the polynomial boundary equation
double precision, dimension(:, :), allocatable :: R !this stores the polynomial boundary equation
double precision, dimension(:, :), allocatable :: vec !this stores the polynomial boundary equation
double precision, dimension(:, :), allocatable :: lwork !this stores the polynomial boundary equation
double precision, dimension(:), allocatable :: alphar, beta
double precision, dimension(:), allocatable :: alphai, work
double precision, dimension(1, 1) :: dummy
double precision, dimension(:), allocatable :: RESID
double precision, dimension(:, :), allocatable :: V, z
double precision, dimension(:), allocatable :: workd, workl
double precision, dimension(:), allocatable :: workev
double precision, dimension(:), allocatable :: Ax, DI, DR
integer, dimension(:), allocatable :: Ap, Ai
integer, dimension(11) :: IPARAM
integer, dimension(14) :: IPNTR
integer, dimension(1) :: h
double precision :: control(20), info(90), tol
logical, dimension(:), allocatable :: select
logical :: rvec(1)
double precision, dimension(:), allocatable :: tempvec
external daxpy, dnrm2, dpttrf, dpttrs, dlapy2
intrinsic abs
call get_command_argument(1, String)
read(String, '(i10)') O
call get_command_argument(2, String)
read(String, '(i10)') NEV
call get_command_argument(3, String)
write(*, *) 'try to allocate enough memory for full matrices'
!this is wh the matrix is created
allocate(lap((O + 1)**2, (O + 1)**2)) !this stores the polynomial boundary equation
allocate(temp((O + 1)**2, (O + 1)**2)) !this stores the polynomial boundary equation
allocate(R((O + 1)**2, (O + 1)**2)) !this stores the polynomial boundary equation
allocate(alphar((O+1)**2)) !this stores the polynomial boundary equation
allocate(alphai((O+1)**2)) !this stores the polynomial boundary equation
allocate(beta((O+1)**2)) !this stores the polynomial boundary equation
allocate(vec((O + 1)**2, (O + 1)**2)) !this stores the polynomial boundary equation
allocate(work(8*((O+1)**2))) !this stores the polynomial boundary equation
allocate(lwork(2*((O+1)**2), 2*((O+1)**2))) !this stores the polynomial boundary equation
allocate(RESID((O+1)**2)) !this stores the initial and last eigenvector
allocate(V((O+1)**2,20+NEV)) !this stores the eigenvectors
allocate(workd(3*((O+1)**2))) !this stores the eigenvectors
allocate(workl(30*(20+NEV)**2 + 60*(20+NEV))) !this stores the eigenvectors
allocate(workev(3*(20+NEV))) !this stores the eigenvectors
allocate(tempvec((O+1)**2)) !this stores the eigenvectors
allocate(DI(NEV+1)) !this stores the eigenvectors
allocate(DR(NEV+1)) !this stores the eigenvectors
allocate(select(20+NEV)) !this stores the eigenvectors
allocate(z((O+1)**2,1+NEV)) !this stores the eigenvectors
write(*, *) 'memory for matrices allocated'
!create the matrix to be solved
!solver the matrix
write(*, '(25F20.5)') DI !these are the real and imaginary part of solution
write(*, '(25F20.5)') DR
end program
当我尝试删除 alphai、alphar、lwork 时，一切都崩溃了。他们甚至没有被使用。