variable_instance_set(instance_id, name, val);
|instance_id||The unique ID value of the instance to use|
|name||The name of the variable to set (as a string)|
|val||The value to set the variable to|
With this function you can set the value of a given named variable. You supply the unique instance ID value (which can be found from the room editor, or is returned when you call the function instance_create) as well as the name of the variable to get the value of as a string (see example code below). If the variable does not exist already in the instance it will be created and then assigned the value.
if !variable_instance_exists(id, "shields")
variable_instance_set(id, "shields", 0);
The above code will check to see if an instance variable exists in the calling instance and if it does not then it is created and set to 0.