# Error while using m3interp **URL:** \ **Category:** I/O API\ **Created:** [May 29, 2020, 4:57am UTC](https://forum.cmascenter.org/t/error-while-using-m3interp/1529 "2020-05-29T04:57:09Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![skunwar](https://avatars.discourse-cdn.com/v4/letter/s/9f8e36/32.png) [@skunwar](https://forum.cmascenter.org/u/skunwar)\ **Post date:** [May 29, 2020, 4:57am UTC](https://forum.cmascenter.org/t/error-while-using-m3interp/1529/1 "2020-05-29T04:57:09Z")
Hi @cjcoats, I was wondering if you could check what could have caused the problem with using m3interp to interpolate 6-hr BC files to 3-hr BC files: ``` "INFILE" opened as OLD:READ-ONLY File name "temp_2_file_with_remaining_time.ncf" File type BNDARY3 Execution ID "????????????????" Grid name "12US2_CROSS" Dimensions: 246 rows, 396 cols, 34 lays, 53 vbles, 1 cells thick NetCDF ID: 65536 opened as READONLY Starting date and time 2014002:030000 (3:00:00 Jan. 2, 2014) Timestep 060000 (6:00:00 hh:mm:ss) Maximum current record number 37 If you wish to copy time steps (keeping the output grid the same) instead of interpolating them to a new output grid, respond "SAME" to the prompt for output grid name. Otherwise, give the GRIDDESC name for the output grid. Value for PROMPTFLAG not defined;returning default: TRUE Enter output grid name, or "SAME" ["SAME"] >> Using default "SAME" Value for PROMPTFLAG not defined;returning default: TRUE Enter STARTING DATE for time step sequence [2014002] >> Using default 2014002 Enter STARTING TIME for time step sequence [30000] >> Using default 30000 Enter TIME STEP for time step sequence [60000] >>30000 Using response 30000 Enter NRECS for time step sequence [73] >> Using default 73 Enter name for output data file ["OUTFILE"] >> Using default "OUTFILE" Value for IOAPI_CHECK_HEADERS not defined;returning default: FALSE Value for IOAPI_OFFSET_64 not defined;returning default: TRUE Value for IOAPI_CFMETA not defined;returning default: FALSE Value for IOAPI_CMAQMETA not defined; returning defaultval ': 'NONE' Value for IOAPI_CMAQMETA not defined; returning defaultval ': 'NONE' Value for IOAPI_SMOKEMETA not defined; returning defaultval ': 'NONE' Value for IOAPI_SMOKEMETA not defined; returning defaultval ': 'NONE' Value for IOAPI_TEXTMETA not defined; returning defaultval ': 'NONE' Value for IOAPI_TEXTMETA not defined; returning defaultval ': 'NONE' "OUTFILE" opened as UNKNOWN(R-W) File name "temp_3_file_with_remaining_time_in_3hr_intervals.ncf" File type BNDARY3 Execution ID "????????????????" Grid name "12US2_CROSS" Dimensions: 246 rows, 396 cols, 34 lays, 53 vbles, 1 cells thick NetCDF ID: 131072 opened as READWRITE Starting date and time 2014002:030000 (3:00:00 Jan. 2, 2014) Timestep 030000 (3:00:00 hh:mm:ss) Maximum current record number 0 Processing 2014002:030000 >>--->> WARNING in subroutine M3INTERP:INTERP3 Size error for NO from INFILE--REQ:3312144 ACT: 43792 M3WARN: DTBUF 3:00:00 Jan. 2, 2014 (2014002:030000) *** ERROR ABORT in subroutine M3INTERP Failure reading variable "NO" from file "INFILE" Date and time 3:00:00 Jan. 2, 2014 (2014002:030000) ``` NO is the first variable in INFILE but I don’t know why it could not be read at the very first timestamp 2014002:30000 ---
**Author:** ![cjcoats](https://avatars.discourse-cdn.com/v4/letter/c/ac8455/32.png) [@cjcoats](https://forum.cmascenter.org/u/cjcoats)\ **Post date:** [May 29, 2020, 10:43am UTC](https://forum.cmascenter.org/t/error-while-using-m3interp/1529/2 "2020-05-29T10:43:18Z")
Curious. `NSIZE1 = NCOLS1*NROWS1*NLAYS1` is calculated at line 258 of _m3interp.f_ and should be (according to your log) 3312144 at that point, and it is then being used at line 528 without having been changed – but INTERP3 is saying that it is 43792 inside the call at that line. I don’t understand how it could have been corrupted, but it seems to be… ---
**Author:** ![skunwar](https://avatars.discourse-cdn.com/v4/letter/s/9f8e36/32.png) [@skunwar](https://forum.cmascenter.org/u/skunwar)\ **Post date:** [May 29, 2020, 2:17pm UTC](https://forum.cmascenter.org/t/error-while-using-m3interp/1529/3 "2020-05-29T14:17:33Z")
The BC file which I intend to interpolate has `PERIM = 1288` and `NLAYS = 34`, so `# of BC CELLS = PERIM*NLAYS=1288*34=43792`. The `NSIZE1=3312144` is for the 2D gridded file which the BC file ‘surrounds’ on the south, east, north and west. ---
**Author:** ![cjcoats](https://avatars.discourse-cdn.com/v4/letter/c/ac8455/32.png) [@cjcoats](https://forum.cmascenter.org/u/cjcoats)\ **Post date:** [May 29, 2020, 4:28pm UTC](https://forum.cmascenter.org/t/error-while-using-m3interp/1529/4 "2020-05-29T16:28:07Z")
Congratulations! You’ve found a bug: in the past, _m3interp_ has always been used with gridded files, not with boundary-condition files, so this one has slipped past the testing. It is now fixed and documented, and the fixes have been uploaded to both the GitHub and the CMAS web-sites. – Carlie ---
**Author:** ![skunwar](https://avatars.discourse-cdn.com/v4/letter/s/9f8e36/32.png) [@skunwar](https://forum.cmascenter.org/u/skunwar)\ **Post date:** [May 29, 2020, 8:24pm UTC](https://forum.cmascenter.org/t/error-while-using-m3interp/1529/5 "2020-05-29T20:24:54Z")
Thanks for updating! I am getting the same error though, with the new I/O API library installation using github clone! ``` Program version: $Id:: m3interp.f 166 2020-05-29 15:55:46Z coats $ Value for PROMPTFLAG not defined;returning default: TRUE Continue with program? (Y/N) [Y] >> Returning default value TRUE for query: "Continue with program?" Value for PROMPTFLAG not defined;returning default: TRUE Enter name for input synch file, or "NONE" [NONE] >> Enter name for input data file [INFILE] >> Value for IOAPI_CHECK_HEADERS not defined;returning default: FALSE "INFILE" opened as OLD:READ-ONLY File name "temp_2_file_with_remaining_time.ncf" File type BNDARY3 Execution ID "????????????????" Grid name "12US2_CROSS" Dimensions: 246 rows, 396 cols, 34 lays, 53 vbles, 1 cells thick NetCDF ID: 65536 opened as READONLY Starting date and time 2014002:030000 (3:00:00 Jan. 2, 2014) Timestep 060000 (6:00:00 hh:mm:ss) Maximum current record number 37 If you wish to copy time steps (keeping the output grid the same) instead of interpolating them to a new output grid, respond "SAME" to the prompt for output grid name. Otherwise, give the GRIDDESC name for the output grid. Value for PROMPTFLAG not defined;returning default: TRUE Enter output grid name, or "SAME" ["SAME"] >> Using default "SAME" Value for PROMPTFLAG not defined;returning default: TRUE Enter STARTING DATE for time step sequence [2014002] >> Using default 2014002 Enter STARTING TIME for time step sequence [30000] >> Using default 30000 Enter TIME STEP for time step sequence [60000] >>30000 Using response 30000 Enter NRECS for time step sequence [73] >> Using default 73 Enter name for output data file ["OUTFILE"] >> Using default "OUTFILE" Value for IOAPI_CHECK_HEADERS not defined;returning default: FALSE Value for IOAPI_OFFSET_64 not defined;returning default: TRUE Value for IOAPI_CFMETA not defined;returning default: FALSE Value for IOAPI_CMAQMETA not defined; returning defaultval ': 'NONE' Value for IOAPI_CMAQMETA not defined; returning defaultval ': 'NONE' Value for IOAPI_SMOKEMETA not defined; returning defaultval ': 'NONE' Value for IOAPI_SMOKEMETA not defined; returning defaultval ': 'NONE' Value for IOAPI_TEXTMETA not defined; returning defaultval ': 'NONE' Value for IOAPI_TEXTMETA not defined; returning defaultval ': 'NONE' "OUTFILE" opened as UNKNOWN(R-W) File name "temp_3_file_with_remaining_time_in_3hr_intervals.ncf" File type BNDARY3 Execution ID "????????????????" Grid name "12US2_CROSS" Dimensions: 246 rows, 396 cols, 34 lays, 53 vbles, 1 cells thick NetCDF ID: 131072 opened as READWRITE Starting date and time 2014002:030000 (3:00:00 Jan. 2, 2014) Timestep 030000 (3:00:00 hh:mm:ss) Maximum current record number 0 Processing 2014002:030000 >>--->> WARNING in subroutine M3INTERP:INTERP3 Size error for NO from INFILE--REQ: 21896 ACT: 43792 M3WARN: DTBUF 3:00:00 Jan. 2, 2014 (2014002:030000) *** ERROR ABORT in subroutine M3INTERP Failure reading variable "NO" from file "INFILE" Date and time 3:00:00 Jan. 2, 2014 (2014002:030000) ``` I am not sure why the error is showing! ---
**Author:** ![cjcoats](https://avatars.discourse-cdn.com/v4/letter/c/ac8455/32.png) [@cjcoats](https://forum.cmascenter.org/u/cjcoats)\ **Post date:** [May 29, 2020, 9:05pm UTC](https://forum.cmascenter.org/t/error-while-using-m3interp/1529/6 "2020-05-29T21:05:25Z")
My bad. Quick fix: Line 264 should have `NSIZE1 = 2*N*NTHIK3D*NLAYS1` and line 333 should have `SIZE = 2*NTHIK3D*( NCOLS3D + NROWS3D + 2*NTHIK3D )` and re-build. Will fix the repositories tomorrow… ---
**Author:** ![skunwar](https://avatars.discourse-cdn.com/v4/letter/s/9f8e36/32.png) [@skunwar](https://forum.cmascenter.org/u/skunwar)\ **Post date:** [May 29, 2020, 9:26pm UTC](https://forum.cmascenter.org/t/error-while-using-m3interp/1529/7 "2020-05-29T21:26:46Z")
Works now - thanks a lot for your prompt answers!