Inner Product Calculator

Enter the coordinates of vector a: X:

Enter the coordinates of vector b: X:


What is Inner Product Calculator?

An inner product calculator is a mathematical tool that calculates the inner product or dot product of two vectors. The inner product of two vectors is a scalar value that represents the amount of similarity or the degree of alignment between the two vectors. It is calculated by multiplying the corresponding components of the two vectors and adding the results.

Formula for Inner Product Calculation

The formula for calculating the inner product of two vectors a and b is as follows:

a * b = |a| * |b| * cos(x)

Here, |a| and |b| are the magnitudes of vectors a and b, respectively, and x is the angle between the two vectors.

Example of Inner Product Calculation

Suppose we have two vectors a and b, given as follows:

a = [3, 4, 5] b = [6, 7, 8]

To calculate the inner product of a and b, we first find their magnitudes as follows:

|a| = sqrt(3^2 + 4^2 + 5^2) = sqrt(50) ≈ 7.071 |b| = sqrt(6^2 + 7^2 + 8^2) = sqrt(149) ≈ 12.206

Next, we find the dot product of a and b by multiplying their corresponding components and adding the results:

a * b = 36 + 47 + 5*8 = 86

Finally, we can calculate the angle between the two vectors using the dot product formula:

cos(x) = (a * b) / (|a| * |b|) = 86 / (7.071 * 12.206) ≈ 0.949

So, the inner product of a and b is:

a * b = |a| * |b| * cos(x) = 7.071 * 12.206 * 0.949 ≈ 81.63

How to Calculate Inner Product using the Calculator

To use the Inner Product Calculator, you need to enter the coordinates of vector a and vector b in the provided input fields. Then, click on the “Calculate” button, and the calculator will output the inner product of the two vectors.


What is the significance of the inner product of two vectors?

The inner product of two vectors represents the similarity or alignment between them. It is widely used in various fields such as physics, engineering, and computer science to calculate distances, angles, and projections.

What is the difference between the dot product and inner product?

The dot product and inner product are often used interchangeably. However, the term “inner product” is more general and can refer to any bilinear form that satisfies certain properties. In contrast, the dot product is specifically the inner product of Euclidean space.

Can the inner product be negative?

Yes, the inner product can be negative if the angle between the two vectors is obtuse (greater than 90 degrees). In this case, the cosine of the angle is negative, resulting in a negative inner product value.


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