Api Arrays

[kakle]

hi, i need help to setup the output array from my node. I have so far a type attribute(string), a numericArray(k2Double) input and a numericArray(k3Double) output.

to change the length of the input is simple, maya provides a handy button; but i cant find a way to successfully increase the length of the output. my node works for the first entry but when trying to create/go to next output it will fail. i have attempted to use ".setUsesArrayDataBuilder" and ".addlast" but either i am using them wrong or they refer to something else. i need the input and the output to have the same length.

CODE
def nodeInitializer():
    nAttr = OpenMaya.MFnNumericAttribute()
    tAttr = OpenMaya.MFnTypedAttribute()

        #############################create attrs#############################
    try:
                fileNode.aInArray=nAttr.create("inArray","in",OpenMaya.MFnNumericData.k2Double )
                nAttr.setArray( 1 );
                nAttr.setKeyable(1)
        nAttr.setStorable(1)
        nAttr.setReadable(1)
        nAttr.setWritable(1)
    except:
                print "error:001 "
                print sys.exc_info()

        try:
                fileNode.aOutArray=nAttr.create("outArray","out",OpenMaya.MFnNumericData.k3Double )
                nAttr.setArray( 1 );
                nAttr.setKeyable(0)
        nAttr.setStorable(0)
        nAttr.setReadable(1)
        nAttr.setWritable(0)
        nAttr.setHidden(0)
        nAttr.setChannelBox(1)
        nAttr.setUsesArrayDataBuilder(1)
    except:
                print "error:002 "
                print sys.exc_info()

        try:
                fileNode.aAddress = tAttr.create("file", "f", OpenMaya.MFnData.kString )
                tAttr.setKeyable(1)
        tAttr.setStorable(1)
        tAttr.setReadable(1)
        tAttr.setWritable(1)
    except:
                print "error:003 "
                print sys.exc_info()

[kakle]

its ok i found the solution and this is the snippit with the important part

CODE
try:
        try:
                dataHandle=block.inputArrayValue(fileNode.aInArray)
                outHandle  = block.outputArrayValue(fileNode.aOutArray )
        except:
                print "error:027 "
                print sys.exc_info()  
        boutHandle=outHandle.builder()
        count= dataHandle.elementCount()
        for i in xrange(0,count,1):
                try:
                        dataHandle.jumpToElement(i)
                except:
                        print "error:026 "
                        print sys.exc_info()

                child=dataHandle.inputValue()
                value=child.asDouble2()

                rgb=[#,#,#]

                try:
                        boutHandle.addElement(i).set3Double(rgb[0],rgb[1],rgb[2])
                except:
                        print "error:022 "
                        print sys.exc_info()                                

except:
        print "error:023 "
        print sys.exc_info()
try:
        outHandle.set(boutHandle)
        aFile.close()
        block.setClean(plug)
except:
        print "error:020 "
        print sys.exc_info()