Complex number in python

Question

How to write a complex number in python? Indeed I have:

import math
a=3
b=4
function=a*j*x+b*y

I don't want to write directly 3j in my function since I absolutely want to use a, so how to convert a into a complex number? Cause in matlab it works when printing :

a=3
b=a*i

The result will gave: 0 + 3.0000i

Thank you for your answers.

If you want to use j as a complex number, you need 1j.

user2357112
– user2357112

2014-02-05 09:34:39 +00:00
Commented Feb 5, 2014 at 9:34 — user2357112
– user2357112, Commented Feb 5, 2014 at 9:34

Rems · Accepted Answer · 2014-02-05 09:35:46Z

7

j alone is a variable, you can have the complex number by typing 1j

>>> type(j)
NameError: name 'j' is not defined
>>> type(1j)
<type 'complex'>

So your code can be written as a function as

def function(x, y):
    a = 3
    b = 4
    return a*1j*x+b*y

answered Feb 5, 2014 at 9:35

Rems

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1 Comment

RSW Over a year ago

This helps!

Ashwini Chaudhary · Accepted Answer · 2014-02-05 09:22:24Z

2

You can use the complex function to create a complex number from variables:

>>> a = 3
>>> b = 4
>>> complex(a, b)
(3+4j)

edited Feb 5, 2014 at 9:22

answered Feb 5, 2014 at 9:15

Ashwini Chaudhary

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Comments

Maninder Singh · Accepted Answer · 2014-02-05 09:22:58Z

0

You can simply use Python's Built in complex() function

>>> first_number = 10
>>> second_number = 15
>>> complex(first_number, second_number)
(10+15j)

answered Feb 5, 2014 at 9:22

Maninder Singh

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