cast to vector problems - works for L to V and not for a1 to b below

gistfile1.txt

{	notes: " Lists to vectors as below. Vectors to lists would be more efficient as could then sum up over subranges i.e. rows and columns"
	name: MAS1342 20122013 CBA1a_1
	extensions:[stats]
	percentPass: 50
	shuffleQuestions: false
	rulesets:{
			std:[all,fractionNumbers, !collectNumbers,!noLeadingMinus]
			}
			
	navigation: {
		allowregen: true
		showfrontpage: false
		reverse: true
		browse: true
	}

	feedback: {
		showtotalmark: true
	}
	

	questions: [
				{
			name: MAS1342 20122013 CBA1a_1

			variables: {
			
			a: "sort(repeat(random(0..1#0.001),m*n-1))"
			m:"random(4..6)"
			n:"random(4..6)"
			L:"[1,2,3]"
			V:"vector(L)"
			a1:"a+1"
			a0:"[0]+a"
			//b:"vector(a1)"
			//c:"list(b)"
			
			}
			
			
			statement: """
						
			
			
			"""
		

			parts: [
			
		
			
			]
			

			advice: """
			
			
			"""
			
			
		}

	]
			
			
}