- #1
cytochrome
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If you square the magnitude of a vector you get the dot product, correct?
||v||^2 = v . v
Can you also say that
||v|| = sqrt(v . v)?
||v||^2 = v . v
Can you also say that
||v|| = sqrt(v . v)?
Last edited:
Vorde said:Of course, basic algebra.
cytochrome said:Thanks. I didn't know if some weird cosine rule existed in there
The dot product, also known as the scalar product or inner product, is a mathematical operation that takes two vectors and returns a single scalar value. It is calculated by multiplying the corresponding components of the two vectors and then summing the results.
The dot product can be calculated using the formula:
a ⋅ b = a1b1 + a2b2 + ... + anbn
where a and b are two vectors with n components.
The dot product has several important applications, including calculating the angle between two vectors, determining if two vectors are perpendicular, and finding the projection of one vector onto another. It is also used in physics and engineering to calculate work, power, and energy.
Yes, the dot product can be negative. This occurs when the angle between the two vectors is greater than 90 degrees. In this case, the dot product represents the component of one vector that is perpendicular to the other vector.
The dot product and cross product are different types of vector operations. While the dot product returns a scalar value, the cross product returns a vector. The dot product is also commutative, meaning the order of the vectors does not matter, while the cross product is anti-commutative, meaning the order does matter. Additionally, the dot product is used to find the similarity between two vectors, while the cross product is used to find the perpendicular vector to two given vectors.