HP 35s HP 35s scientific calculator - User Guide - Page 154

Dot product Function DOT is used to calculate the dot product of two vectors with the same length. Attempting to calculate the dot product of two vectors of different length causes an error message For 2-D vectors: [A, B], [C, D], dot product is defined as [A, B] [C, D]= A x C +B x D. For 3-D vectors: [A, B, X], [C, D,Y], dot product is defined as [A, B, X] [C, D, Y]= A x C +B x D+X x Y 1. Enter the first Vector 2. Press  3. Enter the second vector 4. Press  Note: The sign, ,here means "dot product" instead of "cross product". For cross product, see chapter 17. Calculate the dot product of two vectors, [1,2] and [3,4] Keys: Display: 9 3 Description: Switches to ALG mode Enters the first vector [1,2] Õ 3 Executes for dot product, and enters the second vector The dot product of two vectors is 11 Calculate the dot product of two vectors, [9,5] and [2.2] Keys: Display: 9 3  3 Description: Switches to RPN mode Enters the first vector [9,5] and enters the second vector [2,2] 10-4 Vector Arithmetic