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musvaage
2024-09-22 10:03:26 -05:00
parent f2921f232b
commit 04b192a2b1
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@@ -238,7 +238,7 @@ arpack-ng - 3.5.0
* Improve cmake build system: disable C++ detection, set default build type.
[ Marco Atzeri]
* Use AC_PROG_FC instead of AC_PROG_F77 for proper inizialization
* Use AC_PROG_FC instead of AC_PROG_F77 for proper initialization
for the usage of AC_FC_LINE_LENGTH. Noted on Cygwin.
[ Denis Davydov ]
README.md
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@@ -93,7 +93,7 @@ About ISO_C_BINDING support:
- The install will now provide `arpack.h/hpp`, `parpack.h/hpp` and friends.
- Examples of use can be found in `./TESTS` and` ./PARPACK/TESTS/MPI`.
ISO_C_BINDING is a feature of modern Fortran meant to handle safely interoperability between Fortran and C (in practice, no more need to use ugly tricks to link F77 functions to C code using "underscored" symbols). Basically, ISO_C_BINDING make sure all fortran variables are typed (which may not always be the case when using `implicit` keyword in fortran): this way, C compilers can link properly. For more informations on ISO_C_BINDING, you can checkout the following links:
ISO_C_BINDING is a feature of modern Fortran meant to handle safely interoperability between Fortran and C (in practice, no more need to use ugly tricks to link F77 functions to C code using "underscored" symbols). Basically, ISO_C_BINDING make sure all fortran variables are typed (which may not always be the case when using `implicit` keyword in fortran): this way, C compilers can link properly. For more information on ISO_C_BINDING, you can checkout the following links:
- <http://fortranwiki.org/fortran/show/ISO_C_BINDING>
- <http://fortranwiki.org/fortran/show/Generating+C+Interfaces>
@@ -356,7 +356,7 @@ TARGET_INCLUDE_DIRECTORIES(main PUBLIC MPI::MPI_Fortran)
TARGET_LINK_LIBRARIES(main MPI::MPI_Fortran)
```
Note: Make sure to update `CMAKE_MODULE_PATH` env variable (otheriwse, `find_package` won't find arpack-ng cmake file).
Note: Make sure to update `CMAKE_MODULE_PATH` env variable (otherwise, `find_package` won't find arpack-ng cmake file).
### FAQ
@@ -373,7 +373,7 @@ Note: Make sure to update `CMAKE_MODULE_PATH` env variable (otheriwse, `find_pac
- Say I have an estimate of an eigen value, how to give this information to arpack?
You need to shift of an amount of about this estimate of `lambda`. Grep `backTransform` in `arpackSolver.hpp` to see an example.
For more informations, checkout "NUMERICAL METHODS FOR LARGE EIGENVALUE PROBLEMS" by Yousef Saad: https://www-users.cse.umn.edu/~saad/eig_book_2ndEd.pdf (paragraph 4.1.2. and section 4.1.).
For more information, checkout "NUMERICAL METHODS FOR LARGE EIGENVALUE PROBLEMS" by Yousef Saad: https://www-users.cse.umn.edu/~saad/eig_book_2ndEd.pdf (paragraph 4.1.2. and section 4.1.).
- Say I have an estimate of an eigen vector, how to give this information to arpack?