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Forum: Fortran Library

Fortran Library information and discussions

  1. DAESL implementation problem

    Dear all, I am trying to change the solver for our system of ordinary differential equations from IVPAG to DAESL. My code is running flawlessly...

    Started by maximus‎, 09-15-2014 11:36 AM
    • Replies: 1
    • Views: 151
    09-28-2014, 12:01 PM Go to last post
  2. Bug in IVOAM

    I think that there is a bug in the IVOAM implementation in FNL7. If the differential equations are autonomous, with initial conditions y=y0 at t=t0,...

    Started by mecej4‎, 02-16-2014 06:56 AM
    • Replies: 2
    • Views: 230
    06-11-2014, 02:47 PM Go to last post
  3. How to decide of check the workspace of LSLXG in IMSL

    Hi everyone, I have a question about the value of workspace in IMSL. Now I use the function of LSLXG to solve a sparse system of linear equations....

    Started by jorsey‎, 04-02-2014 03:15 AM
    lslxg workspace iparam wk
    • Replies: 5
    • Views: 224
    04-14-2014, 11:35 AM Go to last post
  4. Am I missing an agument in IVOAM?

    I'm attempting to use IVOAM, a variable Adams Method, for a three dimensional 2nd order differential equation. I'm running IMSL Fortran Library ver....

    Started by starfighter‎, 02-13-2014 12:17 AM
    • Replies: 5
    • Views: 258
    02-16-2014, 07:04 AM Go to last post
  5. 3-dimension interpolation

    Has anyone used the 3-dimension interpolation tools such as bs3in? I typed in exactly the same codes as those in the IMSL Math/Library documention...

    Started by li1991‎, 06-19-2008 09:18 AM
    • Replies: 8
    • Views: 3,694
    02-06-2014, 02:35 PM Go to last post
  6. Unexpected behavior from BSINT

    Consider this example, which is almost the same as the manual example for BSINT, but with slightly different input data points, a different function...

    Started by mecej4‎, 01-26-2014 02:54 PM
    • Replies: 0
    • Views: 128
    01-26-2014, 02:54 PM Go to last post
  7. tol in differential equation solvers

    tol in differential equation solvers is said to control the local error so that the global error is proportional to tol. I have searched but the...

    Started by fortran90‎, 11-24-2013 03:26 PM
    • Replies: 0
    • Views: 172
    11-24-2013, 03:26 PM Go to last post
  8. Typographical error in listing of example program for LFTZG, FNL-7 manual

    The documentation for IMSL Fortran Library Version 7 (HTML and PDF version) shows, in the example program listing for Routine LFTZG: COMPLEX ...

    Started by mecej4‎, 11-22-2013 06:01 PM
    • Replies: 0
    • Views: 134
    11-22-2013, 06:01 PM Go to last post
  9. how to do LU factor of an s_hbc_sparse matrix

    This is the first time I have tried to use the sparse matrix features in IMSL. My matrix is sparse, symmetric, and positive definite. I want to do...

    Started by xlrotor‎, 08-30-2013 03:37 PM
    • Replies: 0
    • Views: 231
    08-30-2013, 03:37 PM Go to last post
  10. Finding the smallest zero

    I have a function that looks like this Is there a routine to find the smallest zero using imsl? I tried ZBREN but it does not get me the...

    Started by ignacio82‎, 11-21-2012 03:13 PM
    • Replies: 6
    • Views: 684
    08-22-2013, 10:33 AM Go to last post
  11. Rank of matrix function, rank(A), gives wrong results when used in Genetic Algorithm

    Dear friends, I have got the problem with function of 'rank' when using it as a function calculating rank of a matrix in subroutine which has been...

    Started by hoangxd‎, 08-20-2013 02:37 AM
    genetic algorithm, rank, rank of matrix
    • Replies: 0
    • Views: 339
    08-20-2013, 02:37 AM Go to last post
  12. solve linear equation system faster

    Hi I have a code in intel fortran 2011, in this code several AX=B linear equation systems should be solved, "A" matrx is real and not sparse. I've...

    Started by Marzieh‎, 07-10-2013 07:50 AM
    • Replies: 0
    • Views: 245
    07-10-2013, 07:50 AM Go to last post
  13. Thread data sharing using IMSL and OpenMP

    Hello, I have to run a series of minimizations for the same function but with different argument values. I achieve this in a do-loop and I am...

    Started by cjb_1‎, 05-23-2013 12:37 PM
    • Replies: 1
    • Views: 453
    07-08-2013, 12:12 PM Go to last post
  14. Speed issues with version 7

    I'm not sure if this is the right place for this or if this should be filed in a bug report or something so please let me know. I work with...

    Started by rdamadeo‎, 06-14-2013 06:45 AM
    • Replies: 3
    • Views: 349
    06-20-2013, 03:05 PM Go to last post
  15. Migrating from DNCONF to NNLPF

    we are currently migrating our code that uses DNCONF to NNLPF. We are really looking for the migration steps to migrate to new version of IMSL...

    Started by spamujula‎, 05-21-2013 02:17 PM
    • Replies: 2
    • Views: 384
    05-24-2013, 01:02 PM Go to last post
  16. NNLPF in IMSL

    Is NNLPF is functionally EQUIVALENT to DNCONF (which was available in previous version)? or Am I barking up the wrong tree?

    Started by spamujula‎, 05-23-2013 12:22 PM
    • Replies: 0
    • Views: 247
    05-23-2013, 12:22 PM Go to last post
  17. How to make IMSL and MPICH2 work together?

    I want to know how to make IMSL and MPICH2 work together? I writed a program that follow an example. include 'LINK_FNL_SHARED.H' include...

    Started by tzy85222‎, 02-25-2013 10:01 PM
    mpich2 imsl fortran
    • Replies: 0
    • Views: 377
    02-25-2013, 10:01 PM Go to last post
  18. Interpolation in more than 2 dimensions?

    Is there a module in IMSL to do interpolation in more than 2 dimensions? I seek an estimate of y(x1, x2, . . . , xn) from an n-dimensional grid of...

    Started by ignacio82‎, 01-07-2013 12:37 PM
    • Replies: 3
    • Views: 448
    01-08-2013, 09:04 AM Go to last post
  19. exponents of a matrix

    Hello, Is there a routine to calculate the exponent of a matrix?

    Started by yan1982‎, 01-02-2013 03:15 PM
    • Replies: 2
    • Views: 448
    01-05-2013, 01:16 AM Go to last post
  20. solve a differential equation using the routine IM2RK

    Hello, I'm trying to solve a differential equation using the routine IM2RK. But I get this error message in the terminal after displaying some...

    Started by yan1982‎, 12-26-2012 01:59 PM
    • Replies: 7
    • Views: 590
    12-28-2012, 08:29 AM Go to last post

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