# Prescribing wave conditions comes with Segmentation fault **URL:** \ **Category:** TOMAWAC\ **Created:** [November 13, 2024, 12:48pm UTC](https://opentelemac.org/forum/t/prescribing-wave-conditions-comes-with-segmentation-fault/7841 "2024-11-13T12:48:25Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![user\_8525](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/8e8cbc/32.png) [@user\_8525](https://opentelemac.org/forum/u/user_8525)\ **Post date:** [November 13, 2024, 12:48pm UTC](https://opentelemac.org/forum/t/prescribing-wave-conditions-comes-with-segmentation-fault/7841/1 "2024-11-13T12:48:25Z")
I need to prescribe the wave condition (HM0, TP, DIR) at the open boundary nodes (LIFBOR = 5) using a modified LIMWAC (newmeanWAVE.f) subroutine and an ascii file containing the datat at a hourly timestep (boundaryWaves\_meanPeakDirection.dat). This triplet is then replicated to the liquid nodes, and a call to SPEINI is made to compute the directional variance spectrum. However, an inevitable “Segmentation fault - invalid memory reference” occurs… Please see attached file (out). Could anyone provide a tip on how to resolve this issue? [name removed] [newmeanWAVE-4.f](https://opentelemac.org/forum/uploads/short-url/yuLLrCnD1AXmYReYZOX03hSpokw.f) (10.8 KB) ---
**Author:** ![user\_8473](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/8c91f0/32.png) [@user\_8473](https://opentelemac.org/forum/u/user_8473)\ **Post date:** [November 13, 2024, 1:07pm UTC](https://opentelemac.org/forum/t/prescribing-wave-conditions-comes-with-segmentation-fault/7841/2 "2024-11-13T13:07:16Z")
Hello It is difficult to see the error without running the full case but I think you should add a save, so that you keep the value of your array from a call to another. regards ---
**Author:** ![user\_8525](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/8e8cbc/32.png) [@user\_8525](https://opentelemac.org/forum/u/user_8525)\ **Post date:** [November 13, 2024, 1:30pm UTC](https://opentelemac.org/forum/t/prescribing-wave-conditions-comes-with-segmentation-fault/7841/3 "2024-11-13T13:30:59Z")
Dear [name removed] I am attaching the various files needed to run my [name removed] case. Thank you in advance for your time and assistance. [name removed] [case.zip](https://opentelemac.org/forum/uploads/short-url/A0479JKONnSwcMaz83xnMx9nrEq.zip) (1.16 MB) ---
**Author:** ![user\_8525](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/8e8cbc/32.png) [@user\_8525](https://opentelemac.org/forum/u/user_8525)\ **Post date:** [November 13, 2024, 1:33pm UTC](https://opentelemac.org/forum/t/prescribing-wave-conditions-comes-with-segmentation-fault/7841/4 "2024-11-13T13:33:57Z")
Does TOMAWAC interpolate the different parameters (Hm0, [name removed], Dir) between time steps to match the specified timestep in the cas file? ---
**Author:** ![user\_8473](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/8c91f0/32.png) [@user\_8473](https://opentelemac.org/forum/u/user_8473)\ **Post date:** [November 14, 2024, 9:40am UTC](https://opentelemac.org/forum/t/prescribing-wave-conditions-comes-with-segmentation-fault/7841/5 "2024-11-14T09:40:47Z")
hello you will find your fortran so that it works. I have some comments : - it is better to use user\_limwac instead of modifying limwac see examples/tomawac/calais\_test/tom\_variable.cas for an example - I delete one useless call to speinit, this useless call was the reason of the segmentation fault since there was not the good number of arguments in the call - I added the save so that you keep your values a time step to another. - I deleted the 2nd loop on HOURLY\_TIMESTEPS that you were doing at each timestep, since you know you go forward in time. regards [newmeanWAVE.f](https://opentelemac.org/forum/uploads/short-url/eScucuGBxcczQEPNmltC26MwTrK.f) (10.9 KB) ---
**Author:** ![user\_8473](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/8c91f0/32.png) [@user\_8473](https://opentelemac.org/forum/u/user_8473)\ **Post date:** [November 14, 2024, 9:47am UTC](https://opentelemac.org/forum/t/prescribing-wave-conditions-comes-with-segmentation-fault/7841/6 "2024-11-14T09:47:37Z")
Tomawac does not do anything, it is up to you to interpolate, instead of HM0L = HM0L\_MB(TT) you can write something like HM0L = coef \* HM0L\_MB(TT) +(1-coeff)\* HM0L\_MB(TT+1) ---
**Author:** ![user\_8525](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/8e8cbc/32.png) [@user\_8525](https://opentelemac.org/forum/u/user_8525)\ **Post date:** [November 14, 2024, 10:08am UTC](https://opentelemac.org/forum/t/prescribing-wave-conditions-comes-with-segmentation-fault/7841/7 "2024-11-14T10:08:07Z")
Dear [name removed], Thank you very much for your help. Your guidance was clear and extremely helpful, and I truly appreciate the time you took to assist me. It made a real difference. Thanks again for your support and for making the forum such a great resource. [name removed]