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Fortran LAPACK DYSEV 
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#1
May2412, 04:47 PM

P: 1

Hello
I am a beginner in programming with Fortran and I want to use the LAPACK DSYEV in my program. I am an example to determine the eigenvalues of a matrix (3x3) after I use it in my program but when I compile I get this error "" "" "** One entry to DSYEV parameter number 5 Had an illegal value" "" "" Here is my example: Program eigenvalue implicit none ! statements double precision :: A (3.3), w (3), Work (3) integer :: i INFO, LWORK, LDA = 3 character :: N, U ! A matrix A (1 : ) = (/ 3, 1, 3 /) A (2, : ) = (/ 1, 5, 6 /) A (3 : ) = (/ 3, 6, 5 /) CALL DSYEV ('N', 'U', 3, Q, W, LDA, WORK, LWORK, INFO) ! print the solution do i = 1, 3 write (*, 9) i, w (i) end do 9 format ('x [' i1 '] =', f5.2) end programs eigenvalue I know not how I met the LDA or WORK .. LWORK........ thank you 


#2
May2412, 05:41 PM

Mentor
P: 21,311

1) In this line  double precision :: A (3.3)  there should be a comma between the two 3s, not a period. 2) You passed Q in the call to DSYEV. That's the parameter that should be the array A. I found a link to some documentation on DSYEV  it explains what the parameters need to be  http://www.netlib.org/lapack/double/dsyev.f 


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