f_unlimited_dim.f90 File Reference

Demonstrates unlimited dimensions for appendable time-series data (Fortran) More...

Functions/Subroutines
program	f_unlimited_dim
subroutine	handle_err (status)

Detailed Description

Demonstrates unlimited dimensions for appendable time-series data (Fortran)

This is the Fortran equivalent of unlimited_dim.c, demonstrating unlimited dimensions using the Fortran 90 NetCDF API. The program creates a file with an unlimited time dimension and demonstrates appending data.

Learning Objectives:

• Understand NF90_UNLIMITED in Fortran
• Learn to append data to existing files in Fortran
• Work with time-series data patterns in Fortran
• Master file reopening with NF90_WRITE mode

Fortran Unlimited Dimension:

• Define with nf90_def_dim(ncid, "time", NF90_UNLIMITED, dimid)
• Must be first dimension in Fortran (last in C)
• Use nf90_put_var with start and count for appending

Prerequisites:

• f_simple_2D.f90 - Basic file operations
• unlimited_dim.c - C equivalent for comparison

Related Examples:

• unlimited_dim.c - C equivalent
• f_multi_unlimited.f90 - Multiple unlimited dimensions (NetCDF-4)
• f_var4d.f90 - 4D data with time dimension

Compilation:

gfortran -o f_unlimited_dim f_unlimited_dim.f90 -lnetcdff -lnetcdf

Usage:

./f_unlimited_dim
ncdump f_unlimited_dim.nc

Author

Edward Hartnett, Intelligent Data Design, Inc.

Date

2026

Function/Subroutine Documentation

f_unlimited_dim()

program f_unlimited_dim

handle_err()

subroutine f_unlimited_dim::handle_err

(

integer, intent(in)

status

)