# ValueError The truth value of an array with more than one element is ambiguous Use a any or a all

So I’m trying to create an array of the same size as [A]. What I want is a forloop that checks if the 1st value of the ith element in the Array == 0, However it keeps telling me that there is more than one element in the truth value of an array when there shouldnt be as I indexed the 1st value of the ith element in my array. Here is my code:

``````n = 4
N = [i for i in range(1,n+1)]
V = [0] + N
K = N + [5]
M = [0,1]
A = np.array([(i,j,k) for i in V for j in K for k in M if i!=j])

C=[]

for i in A:
if A[i][0]==0:
C.append([0.7])
elif abs(A[i][0]-A[i][1])<=1:
C.append([1])
else:
C.append([0])
``````

### >Solution :

When you go through your for loop, i is already each list in A, you can check this with the below:

``````for i in A:
print(i)
``````

Which returns:

``````[0 1 0]
[0 1 1]
[0 2 0]
[0 2 1]...
``````

So then calling `A[i][0]` gives an array each time rather than an integer, so the comparison `A[i][0] == 0` is not possible. To fix your problem, either do the below, which will change your i to get an index for every element in A:

``````for i in range(len(A)):
if A[i][0]==0:
C.append([0.7])
elif abs(A[i][0]-A[i][1])<=1:
C.append([1])
else:
C.append([0])
``````

Or change all instances of `A[i][x]` to `i[x]`, and use the each list element of A that way, as follows:

``````for i in A:
if i[0]==0:
C.append([0.7])
elif abs(i[0]-i[1])<=1:
C.append([1])
else:
C.append([0])
``````