In outcomes for a Generative Design study, an asterisk (*) means that no value can be displayed for a particular output variable.
In general, the Generative Design interface displays a single number for each output variable in a study. If a study returns data that can't be converted into a single number, it is replaced by an asterisk (*), indicating that a single numeric value is not available.
This situation may be the result of various issues with the Dynamo graph used to run the study. Ask the Dynamo author to check the graph for the following:
- Empty output or empty list: If a node that is upstream from an output node encounters an error, it can prevent the rest of the graph from computing. As a result, an empty value ("") is returned to Generative Design.
- List: The output node receives a list containing multiple numbers.
- Infinity: A math operation returns the value "Infinity," often the result of dividing a number by zero.
- NaN (Not a number): Some of the math and list operation nodes can output "NaN" after encountering a logical error. For example, this error can result from the Math.Map node, which is designed to map a number or a list of numbers to a new domain. If the same value is passed to all three inputs of that node (rangeMin, rangeMax, and inputValue), the node returns "NaN".