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How to Multiply List In the Elixir?

2 minutes read

To multiply a list in Elixir, you can use the Enum.reduce/3 function along with the * operator to concatenate the list a certain number of times. This can be achieved by passing the list, the number of times to multiply, and an initial accumulator value to Enum.reduce/3. Within the reduce function, you can append the list to the accumulator using the ++ operator. This will effectively multiply the list by the specified number of times.


What is the result of multiplying a list by a sparse matrix in Elixir?

Multiplying a list by a sparse matrix in Elixir will result in calculating the dot product of the list with the sparse matrix. Each element of the list will be multiplied with the corresponding non-zero elements of the sparse matrix, and the results will be summed up to produce a single value. The final result will be a single value, which is the outcome of the dot product operation.


How to multiply a list by a tensor in Elixir?

To multiply a list by a tensor in Elixir, you can use the following code snippet as an example:

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list = [1, 2, 3]
tensor = 2

result = Enum.map(list, fn x -> x * tensor end)

IO.inspect(result)  # Output: [2, 4, 6]


In this code, we have a list [1, 2, 3] and a tensor 2. We use Enum.map to iterate over each element of the list and multiply it by the tensor value. The result is then stored in the result variable, which will be [2, 4, 6] in this case. Finally, we use IO.inspect to output the result.


What is the result of multiplying a list by a triangular matrix in Elixir?

When multiplying a list by a triangular matrix in Elixir, the result would be a new list where each element is the dot product of the corresponding row of the matrix and the input list.


The dimension of the list and the number of columns in the triangular matrix must match in order to perform the multiplication. If they do not match, an error will be raised.


Here is an example of how you can multiply a list by a triangular matrix in Elixir:

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list = [1, 2, 3]
matrix = [[1, 0, 0],
          [4, 5, 0],
          [7, 8, 9]]

result = Enum.map(matrix, fn row ->
  Enum.zip(row, list) |> Enum.reduce(0, fn({a, b}, acc) -> a * b + acc end)
end)

IO.inspect(result)  # Output: [1, 13, 44]


In this example, we multiply the list [1, 2, 3] by a triangular matrix and the result is [1, 13, 44].

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