# Feature Request **URL:** https://community.freefem.org/c/features-request/6.md?page=1 [Latest](https://community.freefem.org/latest.md) · [Categories](https://community.freefem.org/categories.md) **Page:** 2 --- ## [Error in the compilator](https://community.freefem.org/t/error-in-the-compilator/2583)
**Author:** [@Gooyoon](https://community.freefem.org/u/Gooyoon)\ **Replies:** 0\ **Last updated:** [July 5, 2023, 11:12am UTC](https://community.freefem.org/t/error-in-the-compilator/2583 "2023-07-05T11:12:37Z")
Dear all, I am very new to the FreeFem++ program. So I need your help. I want to continue to do simulations of bending objects. However, the following error continues to appear. – mesh: Nb of Triangles = 1440, Nb… --- ## [Request software data information](https://community.freefem.org/t/request-software-data-information/2540)
**Author:** [@cyrill](https://community.freefem.org/u/cyrill)\ **Replies:** 0\ **Last updated:** [June 13, 2023, 6:06am UTC](https://community.freefem.org/t/request-software-data-information/2540 "2023-06-13T06:06:24Z")
Dear community, I am a mechanical engineering student at RPTU and currently writing my master thesis in the field of topology optimization. Within the scope of the work, I would like to mention detailed information abo… --- ## [Which equations should you use to find the maximum stresses of a beam in FreeFren?](https://community.freefem.org/t/which-equations-should-you-use-to-find-the-maximum-stresses-of-a-beam-in-freefren/2455)
**Author:** [@cielo](https://community.freefem.org/u/cielo)\ **Replies:** 0\ **Last updated:** [May 14, 2023, 4:22am UTC](https://community.freefem.org/t/which-equations-should-you-use-to-find-the-maximum-stresses-of-a-beam-in-freefren/2455 "2023-05-14T04:22:48Z")
Determine the displacements, maximum stresses and deformations by means of finite elements in a bisupported beam --- ## [Multiple border syntax](https://community.freefem.org/t/multiple-border-syntax/2417)
**Author:** [@denis.crete](https://community.freefem.org/u/denis.crete)\ **Replies:** 3\ **Last updated:** [April 28, 2023, 8:19am UTC](https://community.freefem.org/t/multiple-border-syntax/2417 "2023-04-28T08:19:12Z")
Under Linux, the following feature exists and works well: the instruction border bordername(t=0,1;i) { … X\[i\]…} generates a set of borders with index i, one for each component of the array X. Unfortunately, this featu… --- ## [Hyphens/Dashes in variable name](https://community.freefem.org/t/hyphens-dashes-in-variable-name/2388)
**Author:** [@ffeppon](https://community.freefem.org/u/ffeppon)\ **Replies:** 5\ **Last updated:** [April 17, 2023, 8:54am UTC](https://community.freefem.org/t/hyphens-dashes-in-variable-name/2388 "2023-04-17T08:54:11Z")
Dear developers, So far, it seems that FreeFEM does not allow variable names with hyphens or dashes, for instance: real a\_variable\_with\_hyphens = 3; Is there a good reason for this ? Sometimes, using hyphens improves … --- ## [Versioning issue for savesol/readsol use?](https://community.freefem.org/t/versioning-issue-for-savesol-readsol-use/2306)
**Author:** [@plouraboue](https://community.freefem.org/u/plouraboue)\ **Replies:** 2\ **Last updated:** [March 4, 2023, 11:23pm UTC](https://community.freefem.org/t/versioning-issue-for-savesol-readsol-use/2306 "2023-03-04T23:23:15Z")
Hi all, I am new in this forum, so please excuse this question if naive. I am running FreeFem++ v4.7 in MacOs, and trying to use the savesol/readsol commands. In the documentation it seems to come with v4.6 but it is n… --- ## [KSPSolveTranspose?](https://community.freefem.org/t/kspsolvetranspose/2291)
**Author:** [@cmd](https://community.freefem.org/u/cmd)\ **Replies:** 4\ **Last updated:** [February 25, 2023, 9:16am UTC](https://community.freefem.org/t/kspsolvetranspose/2291 "2023-02-25T09:16:13Z")
Hello, I was unable to find any documentation about the implementation of KSPSolveTranspose in the FF/PETSc interface, though I can see it is mentioned in PETSc-code.hpp. I was wondering if this: load "PETSc" Mat A; re… --- ## [Compare fem solutions on uniformly refined meshes with the one on a very refined mesh](https://community.freefem.org/t/compare-fem-solutions-on-uniformly-refined-meshes-with-the-one-on-a-very-refined-mesh/2010)
**Author:** [@HD80](https://community.freefem.org/u/HD80)\ **Replies:** 2\ **Last updated:** [September 21, 2022, 7:06am UTC](https://community.freefem.org/t/compare-fem-solutions-on-uniformly-refined-meshes-with-the-one-on-a-very-refined-mesh/2010 "2022-09-21T07:06:25Z")
Hi, in freemfem, is it possible to compare the finite element solutions on uniformly refined meshes with the solution on a very very refined one (as a reference solution), in a respectively norm? Thanks --- ## [Supporting higher order elements in iovtk](https://community.freefem.org/t/supporting-higher-order-elements-in-iovtk/1302)
**Author:** [@ivan](https://community.freefem.org/u/ivan)\ **Replies:** 1\ **Last updated:** [August 4, 2022, 9:45am UTC](https://community.freefem.org/t/supporting-higher-order-elements-in-iovtk/1302 "2022-08-04T09:45:43Z")
For some time now Paraview has supported arbitrary order Lagrange finite elements, see https://blog.kitware.com/modeling-arbitrary-order-lagrange-finite-elements-in-the-visualization-toolkit/ Currently the iovtk modu… --- ## [Hexahedral Elements](https://community.freefem.org/t/hexahedral-elements/1796)
**Author:** [@hamed](https://community.freefem.org/u/hamed)\ **Replies:** 1\ **Last updated:** [June 3, 2022, 8:41am UTC](https://community.freefem.org/t/hexahedral-elements/1796 "2022-06-03T08:41:02Z")
Hexahedral mesh is quite useful in eddy-current problems. --- ## [Shift operator for periodic functions](https://community.freefem.org/t/shift-operator-for-periodic-functions/1637)
**Author:** [@Alexandru](https://community.freefem.org/u/Alexandru)\ **Replies:** 5\ **Last updated:** [April 8, 2022, 3:56pm UTC](https://community.freefem.org/t/shift-operator-for-periodic-functions/1637 "2022-04-08T15:56:23Z")
Dear all, Assume u is a periodic scalar field on \[0,1\] (i.e. u(0)=u(1)) and the variational formulation of the problem depends on u(x) and u(x+a). Is there a simple procedure to obtain u(x+a) from u(x) (right shift) in… --- ## [Relative Boundary conditions](https://community.freefem.org/t/relative-boundary-conditions/1616)
**Author:** [@mahdi](https://community.freefem.org/u/mahdi)\ **Replies:** 1\ **Last updated:** [March 22, 2022, 4:03pm UTC](https://community.freefem.org/t/relative-boundary-conditions/1616 "2022-03-22T16:03:38Z")
The relative Boundary conditions is a boundary condition where a relation exists between two Boundaries. (The simplest type is a periodic one which equate two Boundary conditions.) For instance P|B=P|A +const. This can… --- ## [Slepc ESPSetDeflationSpace function](https://community.freefem.org/t/slepc-espsetdeflationspace-function/508)
**Author:** [@e-aranda](https://community.freefem.org/u/e-aranda)\ **Replies:** 11\ **Last updated:** [February 18, 2022, 3:34pm UTC](https://community.freefem.org/t/slepc-espsetdeflationspace-function/508 "2022-02-18T15:34:35Z")
I am solving an eigenvalue problem and looking for information at SLEPc manual I have seen the function EPSSetDeflationSpace. I think it is not implemented in the SLEPc plugin. It would be possible to add? Thanks, Erne… --- ## [Adding MatDiagonalSet, MatAXPY and MatAYPX](https://community.freefem.org/t/adding-matdiagonalset-mataxpy-and-mataypx/1345)
**Author:** [@aszaboa](https://community.freefem.org/u/aszaboa)\ **Replies:** 37\ **Last updated:** [January 28, 2022, 4:40pm UTC](https://community.freefem.org/t/adding-matdiagonalset-mataxpy-and-mataypx/1345 "2022-01-28T16:40:24Z")
Dear Developers, I am solving an evolution problem, which works nicely, but I am trying to optimize it. As not every part of my system matrix changes in each step, I would like to make my code more efficient by assembli… --- ## [PreCICE adaptor for coupling simulations](https://community.freefem.org/t/precice-adaptor-for-coupling-simulations/1310)
**Author:** [@ivan](https://community.freefem.org/u/ivan)\ **Replies:** 1\ **Last updated:** [November 17, 2021, 1:07pm UTC](https://community.freefem.org/t/precice-adaptor-for-coupling-simulations/1310 "2021-11-17T13:07:28Z")
preCICE (https://precice.org/) is an open-source coupling library for partitioned multi-physics simulations, including, but not restricted to fluid-structure interaction and conjugate heat transfer simulations. Several … --- ## [Implementation of Dirichlet boundary condition when tgv=-1](https://community.freefem.org/t/implementation-of-dirichlet-boundary-condition-when-tgv-1/113)
**Author:** [@arousta](https://community.freefem.org/u/arousta)\ **Replies:** 4\ **Last updated:** [August 19, 2021, 7:37am UTC](https://community.freefem.org/t/implementation-of-dirichlet-boundary-condition-when-tgv-1/113 "2021-08-19T07:37:11Z")
As far as I read, when using tgv=-1, freefem doesn’t apply dirichlet BC in a symmetric way. The symmetric way would look like this: The asymmetric way only modifies the third row without setting the column values t… --- ## [SLEPc PEP request](https://community.freefem.org/t/slepc-pep-request/1130)
**Author:** [@aszaboa](https://community.freefem.org/u/aszaboa)\ **Replies:** 6\ **Last updated:** [August 13, 2021, 8:17am UTC](https://community.freefem.org/t/slepc-pep-request/1130 "2021-08-13T08:17:54Z")
Hi! I am interested in solving polynomial eigenvalue problems using parallel FreeFem. Could you please interface the SLEPc Polnynomial Eigenvalue Problem in the near future? Thanks Andras --- ## [Edit to documentation. State Neumann (natural) boundary are implicitly handled](https://community.freefem.org/t/edit-to-documentation-state-neumann-natural-boundary-are-implicitly-handled/1125)
**Author:** [@kevinmo08](https://community.freefem.org/u/kevinmo08)\ **Replies:** 0\ **Last updated:** [July 28, 2021, 8:07pm UTC](https://community.freefem.org/t/edit-to-documentation-state-neumann-natural-boundary-are-implicitly-handled/1125 "2021-07-28T20:07:53Z")
Hi all, I’ve seen a few posts in the past asking about implementing Neumann boundary conditions, especially homogeneous neumann boundary conditions in FreeFEM++. I think it would be helpful to explicitly state somewher… --- ## [Algebrical equation](https://community.freefem.org/t/algebrical-equation/1124)
**Author:** [@Aicha](https://community.freefem.org/u/Aicha)\ **Replies:** 0\ **Last updated:** [July 28, 2021, 4:54pm UTC](https://community.freefem.org/t/algebrical-equation/1124 "2021-07-28T16:54:38Z")
Hi, can you help me please to resolve this question. I(x,t) is the solution of an variational solution system. To find I(x,t) we use for (real t=0;t\ **Author:** [@xiaodizhang29](https://community.freefem.org/u/xiaodizhang29)\ **Replies:** 0\ **Last updated:** [June 4, 2021, 7:23am UTC](https://community.freefem.org/t/bdm1-face-element-in-3d/1012 "2021-06-04T07:23:25Z") Hello, I am study high order FEMs for Maxwell problems. And I want to use BDM1 face element in 3D, I hope FreeFEM++ can include this element. --- ## [Printf interface](https://community.freefem.org/t/printf-interface/800)
**Author:** [@arousta](https://community.freefem.org/u/arousta)\ **Replies:** 7\ **Last updated:** [May 8, 2021, 11:22pm UTC](https://community.freefem.org/t/printf-interface/800 "2021-05-08T23:22:17Z")
I think it would be great to have printf in freefem. Syntax is shorter (and I believe easier to read) and better fits to the overall style of the freefem code. --- ## [GSL plugin for 2d interpolation](https://community.freefem.org/t/gsl-plugin-for-2d-interpolation/933)
**Author:** [@balajek](https://community.freefem.org/u/balajek)\ **Replies:** 0\ **Last updated:** [April 19, 2021, 11:52pm UTC](https://community.freefem.org/t/gsl-plugin-for-2d-interpolation/933 "2021-04-19T23:52:16Z")
Hi, Can we have the GSL plugin for 2d interpolation - Interpolation — GSL 2.6 documentation? The interface for 1d exists, but not 2d - Gsl interpolation in 2d - #2 by frederichecht. Thanks. Regards, Balaje --- ## [Function 'intalledges' over surface mesh (meshS)](https://community.freefem.org/t/function-intalledges-over-surface-mesh-meshs/892)
**Author:** [@fivanci](https://community.freefem.org/u/fivanci)\ **Replies:** 0\ **Last updated:** [April 6, 2021, 3:06am UTC](https://community.freefem.org/t/function-intalledges-over-surface-mesh-meshs/892 "2021-04-06T03:06:15Z")
Dear developers, I am trying to use ‘intalledges’ function over a surface mesh, but I get the following output: ‘Internal error : intalledges (to do)’. FreeFem++ version is 4.7 (on Manjaro OS). I guess this feature … --- ## [Windows 10 Binary Request](https://community.freefem.org/t/windows-10-binary-request/855)
**Author:** [@fotios.kasolis](https://community.freefem.org/u/fotios.kasolis)\ **Replies:** 5\ **Last updated:** [March 17, 2021, 11:06am UTC](https://community.freefem.org/t/windows-10-binary-request/855 "2021-03-17T11:06:00Z")
Dear Developers, Since Windows 7 reached end-of-life in 2020, is there any chance that a Windows 10 binary will be consistently compiled and uploaded? Thank you in advance. --- ## [Need help about the nonlinear PDE](https://community.freefem.org/t/need-help-about-the-nonlinear-pde/814)
**Author:** [@Salman123](https://community.freefem.org/u/Salman123)\ **Replies:** 0\ **Last updated:** [February 16, 2021, 7:02pm UTC](https://community.freefem.org/t/need-help-about-the-nonlinear-pde/814 "2021-02-16T19:02:17Z")
I am trying to solve the nonlinear problem w.r.t freeFEM++. My problem contain the term uv\\partial w/\\partial x. Where u, v, w are dependent variables. Any one guide me, how I write in the code this term? Please need hel… --- ## [Would that possible to add Mshdist lib in FreeFem](https://community.freefem.org/t/would-that-possible-to-add-mshdist-lib-in-freefem/791)
**Author:** [@zcwang6](https://community.freefem.org/u/zcwang6)\ **Replies:** 6\ **Last updated:** [February 10, 2021, 3:20pm UTC](https://community.freefem.org/t/would-that-possible-to-add-mshdist-lib-in-freefem/791 "2021-02-10T15:20:09Z")
Hello FreeFem team, thx to make such a perfect tool for us; I recently tried to add the Mshdist into FreeFem; However, the Mshdist uses the xxx.mesh or .sol files as its input, as my understanding, FreeFem needs to trans… --- ## [Two small issues with getARGV](https://community.freefem.org/t/two-small-issues-with-getargv/658)
**Author:** [@david.fabre](https://community.freefem.org/u/david.fabre)\ **Replies:** 3\ **Last updated:** [November 18, 2020, 8:49am UTC](https://community.freefem.org/t/two-small-issues-with-getargv/658 "2020-11-18T08:49:07Z")
Hello Here are two little bugs we regularly face with getARGV and which should be easy to fix. 1/ default values for real variables. real toto = getARGV(’-toto’,1) -\> creates a bug real toto = getARGV(’-toto’, 1.) -\>… --- ## [Allow longer strings](https://community.freefem.org/t/allow-longer-strings/608)
**Author:** [@ffeppon](https://community.freefem.org/u/ffeppon)\ **Replies:** 0\ **Last updated:** [October 9, 2020, 12:26pm UTC](https://community.freefem.org/t/allow-longer-strings/608 "2020-10-09T12:26:36Z")
Dear developpers, Is there any particular reason for limiting strings to a maximum of 256 characters in a FreeFEM .edp code ? See https://github.com/arthurlevy/FreeFempp/blob/master/src/fflib/lex.cpp#L288 This limit … --- ## [Binary package for Mac OSX](https://community.freefem.org/t/binary-package-for-mac-osx/537)
**Author:** [@tak](https://community.freefem.org/u/tak)\ **Replies:** 2\ **Last updated:** [August 11, 2020, 1:13am UTC](https://community.freefem.org/t/binary-package-for-mac-osx/537 "2020-08-11T01:13:49Z")
When will the binary package of ver 4.6 for Mac OSX be uploaded? For other operating systems, the latest versions of binary packages are already available. I really want to use the latest version on Mac OSX. Thank you… --- ## [Visualization for Discontinuous Galerkin FE functions](https://community.freefem.org/t/visualization-for-discontinuous-galerkin-fe-functions/527)
**Author:** [@alexey.baykin](https://community.freefem.org/u/alexey.baykin)\ **Replies:** 0\ **Last updated:** [July 31, 2020, 11:40am UTC](https://community.freefem.org/t/visualization-for-discontinuous-galerkin-fe-functions/527 "2020-07-31T11:40:32Z")
Dear Freefem developers, I am working on elasticity equation solving via Discontinuous Galerkin method. Is there a way in FreeFem++ to save P1dc finite element function for visualization in Paraview or some another sci… [Previous page](https://community.freefem.org/c/features-request/6.md) [Next page](https://community.freefem.org/c/features-request/6.md?page=2)