# NumPy polymulx()

`numpy.polynomial.polynomial.polymulx(c)`

The `numpy.polymulx` function multiplies the polynomial `c` with a value `x` which is the independent variable.

The following table shows the return value of the function:

Let’s dive into some examples to show how the function is used in practice:

### Examples

```import numpy as np
import numpy.polynomial.polynomial as poly

print(poly.polymulx([0]) == [0])
print(poly.polymulx([1]) == [0, 1])
for i in range(1, 5):
ser = [0]*i + [1]
tgt = [0]*(i + 1) + [1]
print(poly.polymulx(ser) == tgt)

'''
[ True]
[ True  True]
[ True  True  True]
[ True  True  True  True]
[ True  True  True  True  True]
[ True  True  True  True  True  True]
'''```

This function is inspired from this Github repository.

Any master coder has a “hands-on” mentality with a bias towards action. Try it yourself—play with the function in the following interactive code shell:

Exercise: Change the parameters of your polynomials and print them without the comparisons. Do you understand where they come from?

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