4.1. General instructions

4.1.1. CURP I/O

The CURP program is able to handle either ASCII or NetCDF data files. The NetCDF file is a device independent binary file. Conversely, ASCII files can be sometimes large. For convenience, the CURP program accepts compressed (gzipped) ASCII files with the .gz extension.

Please visit NetCDF site about NetCDF information.

4.1.2. File name specification in the configuration files

To run CURP programs sometimes configuration file/files need to be edited to set up the required parameters and keywords. To specify input/output files in a configuration file, either abosolute or relative path to the I/O file can be indicated in the configuration file. Here, note that the relative path must be the path to the I/O file from the directory in which the configuration file exists.

4.1.3. Compatibility with external MD programs

To analyze the physical properties of proteins, CURP extracts atomic coordinates and velocities from MD trajectory files generated by an external MD program package. At the moment, CURP is only compatible with the trajectory files in the Amber format.

4.1.4. Editing Configuration files

• A Configuration file consists of multiple sections each of which contains parameters.
• A section name is surrounded by [ and ].
• Parameters are given by keyword = value.
• Comments are given by the lines starting with # or ;. You may also begin comments in the middle of the line.

In the CURP configuration file, there are six types of keywords: Int, Float, Bool, File, List, and Choice. For the Choice type, you choose one of the values separated by ‘|’, where the first option of them is set as the default value if not specified explicitly.

4.1.5. Getting online help

The list of possible parameters is shown on the screen by entering curp with –help option as follows:

$ $CURP_HOME/bin/curp --help