I have a Julia vector a defined as follows:
a = [1, 2, 3]
I also have an expression exp stored, which represents the indexing of the second element in vector a:
exp = :(a[2])
Now, I would like to modify the value at the indexed position, i.e., set a[2] to a new value, say 4. However, I am struggling to find the right syntax or method to achieve this.
I've attempted the usual assignment, but it doesn't seem to work as expected:
$exp = 4 # This results in an error
I've also tried using eval, but it doesn't seem to update the vector a:
eval(exp) = 4 # This doesn't update the vector a
Could someone please provide guidance on how to correctly modify the indexed value in the vector a when the index is stored as an expression? Any insights or alternative approaches would be greatly appreciated.
eval an expression using the first one and make there the update.
a = [1, 2, 3]
ex = :(a[2])
eval(:($ex = 4))
a
#3-element Vector{Int64}:
# 1
# 4
# 3