fortran

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Given a huge symmetric positive definite matrix, how to calculate a few diagonal elements of its inverse?

Update: This is a pure Fortran question now; I put the maths stuff on M.SE. Consider a PxP symmetric and positive definite matrix A (P=70000, i.e. A is roughly 40 GB using 8-byte doubles). We want to[详细]

2023-04-04 11:42 分类：问答
Calling function in same module in Fortran90

I am new to Fortran90 and I haven\'t found an answer to a problem I have. I have a module written in Fortran with the some functions inside a module.[详细]

2023-04-03 18:13 分类：问答
No output from a Fortran program using the Gnu Scientific Library via a c wrapper

I\'m trying to write a wrapper to use the gsl library with Fortran. I have managed to get a simple wrapper to work - the example from http://www.helsinki.fi/~fyl_tlpk/luento/ohj-13-GSL-e.html[详细]

2023-04-03 17:46 分类：问答
What is the difference between the various compiler debug flags?

I have found the list of ifort debug flags. However, I am开发者_JAVA百科 confused about some explanation of debug flags. As it stated, -debug can be configured as all, full, minimal and none. May I as[详细]

2023-04-03 14:21 分类：问答
Passing c arrays into fortran as a variable sized matrix

So, i\'ve been commissioned to translate some fortran subroutines into C.These subroutines are being called as part of the control flow of a large porgram based primarily in C.[详细]

2023-04-03 09:53 分类：问答
Fortran compilers/viewers that let you see the dependencies of a given module [duplicate]

This question already has answers here: How can I visualize Fortran (90 or later) source code, e.g. using Graphviz? [closed][详细]

2023-04-02 10:43 分类：问答
Fortran nested loops with one continue

I\'m rewriting some legacy code and came across this: DO 4 I=1,N ... DO 4 J=1,N ... 4 CONT开发者_StackOverflowINUE[详细]

2023-04-02 08:10 分类：问答
Methods for entering equations while programming in C/C++ , Python or Fortran

I am writing a code which had long mathematical equations with many trigonometric and othe开发者_运维技巧r identities. Is there a way of visualising the same expression in latex and making a C or pyth[详细]

2023-04-02 06:22 分类：问答
Linking FORTRAN and C++ objects files

I am going to call a C++ function from FORTRAN, for which I am using ISO_C_Binding module. After compaction of the FORTRAN main file and C++ function with commands[详细]

2023-04-02 03:44 分类：问答
How to find where a library call returns?

I am analyzing an external FORTRAN library which is quite huge. Anyways, the whole point of the library is to fit parameters values for a function I supply. The entry point is one method call with god[详细]

2023-04-02 03:40 分类：问答