The array of ValueEval args contains all arguments passed to the
function. If in Excel you pass N arguments, e.g. FUNC(arg1, arg2,
arg3, ...., argN)
then on the POI side the function takes it as a array of ValueEvals :
{ve1, ve2, ve3, ...veN} where ve1 - ven are instances of the ValueEval
interface.
MINVERSE takes one argument so your code will receive a 1-length array
of ValueEvals.
The concrete type of ValueEval depends on what you pass in Excel:
range, array or reference.
In you code you should check the actual type with instanceof:
case 1: passing a 2D area, e.g. MINVERSE(A1:C5)
if( args[0]instanceof TwoDEval){
TwoDEval area = (TwoDEval )arg;
}
case 2: passing a reference to a 2D area, e.g. MINVERSE(A2) where A2
is a reference to B2: C5
else if( args[0]instanceof RefEval){
;
}
case 3: passing a array, e.g. MINVERSE({1,2,3;4,5,6;7,8,9})
Unfortunately arrays are not yet supported. This means that the syntax
like will not work and POI will throw a exception.
> And then, how do I output an area back to the Excel spreadsheet?
What is the calculation result? If it is a number then return
NumberEval. If it is a range then return AreaEval.
If the result is a array then POI cannot handle it. Array evals are
not yet supported.
Yegor
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