numval

Purpose

Fetch the numeric-value of a kb attribute attrName belonging to concept concept. If there are multiple numeric values, only the first value is returned.

Syntax

returnedNum = numval(concept, attrName);

returnedNum - type: int
concept - type: con
attrName - type: str

Returns

A number, returnedNum.

Remarks

Concepts can have zero or more attributes. Each attribute can have zero or more values. This function takes a concept and attribute name as input arguments and returns the first number associated with the attribute name. Difference vis getsval: getsval expects string values in aValue, or converts numbers to strings. Difference vis getnumval: getnumval expects a number in aValue, and has only one input argument, a value which has already been found, while numval takes two input arguments and finds the attribute by name. If passed a bad argument value, the function writes an error message to the output log.

Example

@CODE
# create a range
G("range") = makeconcept(findroot(), "range");
addnumval(G("range"),"min",33);
addnumval(G("range"),"min",34);
addnumval(G("range"),"max",118);

# access data
"output.txt" << "range = " <<
getnumval(findvals(G("range"), "max")) -
getnumval(findvals(G("range"), "min")) << "\n";
"output.txt" <<
numval(G("range"),"min") << "\n";

Prints out the following to output.txt:

range = 85
33