# numpy.vdot¶

`numpy.``vdot`(a, b)

Return the dot product of two vectors.

The vdot(a, b) function handles complex numbers differently than dot(a, b). If the first argument is complex the complex conjugate of the first argument is used for the calculation of the dot product.

Note that `vdot` handles multidimensional arrays differently than `dot`: it does not perform a matrix product, but flattens input arguments to 1-D vectors first. Consequently, it should only be used for vectors.

Parameters
aarray_like

If a is complex the complex conjugate is taken before calculation of the dot product.

barray_like

Second argument to the dot product.

Returns
outputndarray

Dot product of a and b. Can be an int, float, or complex depending on the types of a and b.

`dot`

Return the dot product without using the complex conjugate of the first argument.

Examples

```>>> a = np.array([1+2j,3+4j])
>>> b = np.array([5+6j,7+8j])
>>> np.vdot(a, b)
(70-8j)
>>> np.vdot(b, a)
(70+8j)
```

Note that higher-dimensional arrays are flattened!

```>>> a = np.array([[1, 4], [5, 6]])
>>> b = np.array([[4, 1], [2, 2]])
>>> np.vdot(a, b)
30
>>> np.vdot(b, a)
30
>>> 1*4 + 4*1 + 5*2 + 6*2
30
```

#### Previous topic

numpy.linalg.multi_dot

numpy.inner