If I understand your question correctly, this should do the trick.
arr = []
for z in np.arange(0, 0.5, 0.01):
Q = a + z
t = b + z
# here I would like to store Q and t in an array
arr.append([t,Q])
for item in arr:
i = item[0]
j = item[1]
It creates a list called arr that stores lists of [Q,t]
values.
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solved Python How to fill an array arr[i, j] within a for loop that calculates the values that will be put into i and j