set_param — Set the value of a parameter in a parameter list
[param_list,err] = set_param(list_name,param_name,param_value)
the list of parameters. This list must have been initialize by a call to init_param.
a string. The name of the parameter to be added in the list of parameters.
the value to be associated to the parameter param_name.
the updated list of parameters.
an error flag which is set to %T if list_name is not of type plist (this list hasn't been initialized by a call to init_param).
This function sets the value of an already existing parameter. If the parameter doesn't exist, err is set to %T. If the err output parameter is not present, when an error occurs, a message is printed in the console.