To ensure that LS-OPT replaces the variables in the input file by integer values, add “:i” to the parameter definition in the input file:
<<variable_name:i>>
This is necessary if the variable specifies e.g. different include files.
*INCLUDE material_type.<<id:i>>
By default, LS-OPT replaces the variable by 10 characters, if the value is shorter, blanks are used. If this is not desired, add “:0” to the parameter definition in the input file:
<<variable_name:0>>
Then LS-OPT uses exactly the number of characters needed.
Both options may be combined:
<<variable:i0>>
Filenames may also be parameterized using string variables.