fortran - forrtl: severe(151) allocatable array already allocated -

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i have used code given in answer netcdf fortran array allocation @ run time run time error when run code

forrtl : severe(151) allocatable array allocated

when recompile -g , -traceback error traced line

allocate(lats(latlen))

can memory modified @ runtime? using fortran , compiler ifort.

here code 

  integer retval,reason,i,in_ndim,ierr   integer ncid, lat_dimid,lat_varid, latlen   integer lon_varid,lonlen   character*(*) lat_name, lon_name   parameter (lat_name='lat', lon_name='lon')   real lats[allocatable](:)   real lons[allocatable](:)    call system('ls hgt_*.nc > hgtfiles.txt')    open(10,file='hgtfiles.txt',action="read")   varname = "hgt"        read(10,*,iostat=reason) in_cfn      if (reason/=0) exit      print *,in_cfn      retval = nf_open(in_cfn,nf_nowrite,ncid)      if (retval .ne. nf_noerr) call handle_err(retval)       retval = nf_inq_dimid(ncid,lat_name,lat_dimid)      if (retval .ne. nf_noerr) call handle_err(retval)       retval = nf_inq_dimlen(ncid,lat_dimid,latlen)      if (retval .ne. nf_noerr) call handle_err(retval)      print *,latlen      allocate(lats(latlen))      retval = nf_inq_varid(ncid,lat_name,lat_varid)      if (retval .ne. nf_noerr) call handle_err(retval)      retval = nf_get_var_real(ncid,lat_varid,lats)      if (retval .ne. nf_noerr) call handle_err(retval)     print *,lats   end   close(10)

you allocating lats inside loop. therefore, @ second iteration allocated , fails error got. have 2 options here:

  • if dimensions not change throughout loop, pull allocation outside
  • or re-allocate array inside loop. in simplest case, need put deallocate(lats) @ end of loop body.

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