Complex operator in polar coords

In summary, the question asks for the derivative of z=x+iy in polar coordinates. The chain rule can be used to calculate this, where r=sqrt(x^2+y^2) and theta=arctan(y/x). The final answer should include the partial derivatives of r and theta with respect to x and y. The use of "f" in the solution is necessary to represent an arbitrary function and is not relevant to the main concept.
  • #1
demidemi
3
0

Homework Statement


If z=x + iy, what is d/dz in polar coordinates?


The Attempt at a Solution



I know that expanded,

d/dz = 1/2 (d/dx) - i (d/dy)

Where to go from there?
 
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  • #2
Use the chain rule:

You have
[tex]\frac{df}{dz}= \frac{\partial f}{\partial x}+ \frac{\partial f}{\partial y}i[/tex]
[tex]= \left(\frac{\partial f}{\partial r}\frac{\partial r}{\partial x}+ \frac{\partial f}{\partial \theta}\right)+ \left(\frac{\partial f}{\partial r}\frac{\partial r}{\partial y}+ \frac{\partial f}{\partial \theta}\frac{\partial \theta}{\partial y}\right)i[/tex]

with, of course, [itex]r= \sqrt{x^2+ y^2}[/itex] and [itex]\theta= arctan(y/x)[/itex].
 
  • #3
Why is "f" necessary there?

Also, should there be a "partial theta partial x" in the first parentheses?
 
Last edited:

FAQ: Complex operator in polar coords

What is a complex operator in polar coordinates?

A complex operator in polar coordinates is a mathematical operator that operates on complex numbers expressed in polar form, which uses a combination of magnitude and angle to represent a complex number instead of the traditional real and imaginary components.

What is the purpose of using polar coordinates in complex operators?

Polar coordinates provide a more intuitive way to represent complex numbers and can simplify complex mathematical operations such as multiplication, division, and exponentiation. They also allow for easier visualization and understanding of complex numbers.

How do you convert a complex number to polar form?

To convert a complex number to polar form, you can use the formula r(cosθ + isinθ), where r is the magnitude of the complex number and θ is the angle it makes with the positive real axis. This can also be achieved by using the Pythagorean theorem and trigonometric functions.

What are the advantages of using polar coordinates over Cartesian coordinates?

Polar coordinates can often simplify complex mathematical operations due to the use of magnitude and angle instead of real and imaginary components. They also allow for easier visualization and interpretation of complex numbers, especially in geometry and physics applications.

Can complex operators be used in other coordinate systems?

Yes, complex operators can be used in other coordinate systems such as cylindrical and spherical coordinates. However, polar coordinates are the most commonly used coordinate system for complex operators due to their advantages and simplicity.

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