Pictorial Representation of Dot Product

Outer Product

In a simplified model for analyzing text, two words are represented by the numerical vectors A = [4, -2, 1] and B = [3, 5, 6]. To compute a similarity score, an operation is performed where the corresponding elements of the two vectors are multiplied together, and the resulting products are then summed to produce a single number. What is the final similarity score?

Calculating a Weighted Final Grade

Consider two numerical lists, X = [1, 5, 3] and Y = [2, 4]. The operation that multiplies corresponding elements and sums the results can be successfully performed on these two lists to produce a single numerical value.

You are given two lists of numbers representing a shopping trip. The first list, Quantities = [3, 1, 2], represents the number of each item bought. The second list, Prices = [2, 5, 4], represents the price of each corresponding item. To find the total cost of the shopping trip, you must perform a specific sequence of calculations. Arrange the following steps in the correct order to calculate the total cost.

Dot Product via Elementwise Multiplication and Summation

Weighted Sum via Dot Product

Cosine of Angle via Dot Product