Help FFT subroutine fortran 77

In summary, the FFT subroutine fortran 77 is a programming tool used for fast Fourier transform calculations. It is commonly used in scientific and engineering applications to efficiently analyze and process data. The subroutine is implemented in the fortran 77 programming language and is known for its high speed and accuracy. It is widely used by researchers and professionals to perform complex mathematical operations and signal processing tasks.
  • #1
seanshee
3
0
Does someone have an effective two-dimensional FFT subroutine in Fortran 77?
 
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  • #2
Numerical building blocks like matrix algebra, linear algebra, or FFTs are not normally programmed by yourself, but taken from libraries. The reason for this is that getting those building blocks right is *very* difficult[1], and you get absolutely nothing from doing them yourself. FFT routines are, for example, provided by MKL or ACML (which are recommended because you also get the matrix stuff), but you can also take them from FFTW, which comes in packages for all linux systems (install fftw3) and can also be used from Fortran.

Note: You mean "efficient". "Effective" and "efficient" are not the same things.

[1] And in the matrix multiplication case, you simply cannot beat BLAS. It's impossible.
 
  • #3
FFTW is wonderful, but if you want a quicker solution, check Ooura's Mathematical Software Packages. I found Ooura's FFT routines to be efficient and easy to use.
 
  • #5


I am not able to provide a specific subroutine for the two-dimensional FFT in Fortran 77, but I can offer some guidance on how to approach this problem. Firstly, it is important to understand the fundamentals of the FFT algorithm and how it can be implemented in Fortran 77. There are many resources available online that provide detailed explanations and examples of FFT subroutines in Fortran 77.

Additionally, it may be helpful to consult with other scientists or programmers who have experience with FFT subroutines in Fortran 77. They may be able to provide insight or even share their own subroutine with you.

Furthermore, it is important to thoroughly test and debug any subroutine before implementing it in your own code. This will ensure that it functions correctly and efficiently.

Finally, it may also be beneficial to consider using a more modern programming language, such as Fortran 90 or 95, which have built-in libraries for FFT calculations. This may save time and effort in developing your own subroutine.

Overall, with a solid understanding of the FFT algorithm and some assistance from other experts, you should be able to find or create an effective two-dimensional FFT subroutine in Fortran 77.
 

Related to Help FFT subroutine fortran 77

What is a FFT subroutine in Fortran 77?

A FFT (Fast Fourier Transform) subroutine in Fortran 77 is a set of instructions written in the Fortran 77 programming language that allows for efficient computation of the discrete Fourier transform. It is commonly used in scientific and engineering applications for analyzing signals and data.

How do I use the FFT subroutine in Fortran 77?

To use the FFT subroutine in Fortran 77, you must first include the necessary libraries and modules in your program. Then, you can call the subroutine with the appropriate parameters, such as the input data array and the desired output array. It is important to follow the specific syntax and guidelines for the particular FFT subroutine you are using.

What are the advantages of using the FFT subroutine in Fortran 77?

The FFT subroutine in Fortran 77 offers several advantages, including faster computation time, reduced memory usage, and improved accuracy compared to other methods of computing the discrete Fourier transform. It also allows for easy implementation in a variety of applications and programming languages.

Are there any limitations to using the FFT subroutine in Fortran 77?

One limitation of using the FFT subroutine in Fortran 77 is that it is not as user-friendly as some other programming languages, as it requires a basic understanding of Fortran 77 syntax and structure. Additionally, it may not perform well for certain types of data or signals, so it is important to carefully select the appropriate subroutine for your specific needs.

Where can I find resources for learning more about the FFT subroutine in Fortran 77?

There are many online resources available for learning more about the FFT subroutine in Fortran 77, including tutorials, documentation, and forums where you can ask questions and discuss with other users. You can also refer to books and textbooks on Fortran programming or signal processing for more in-depth information on the FFT subroutine and its applications.

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