Spiral density function implementation

Hi,

I need to define a Spiral density function with parameters theat (the angle of the spiral) and r (the radius)

Does anyone know how can i do it ?

Thank

[Image Analyst]

What is a spiral density function? Do you have a reference link to its definition and formula? Density of what??? Did you click on the spiral tag on the right hand side of this page?

[Orr Streicher]

I dont have the density function formula.. the assignment is to create a Spiral dentity function where thata distrebution is uniform [0, 4pi] and the radius r has normal distrebution where the expectation mu=thata/2 and std=2.5

[Star Strider]

Is that in any way related to the problem in Creating a 3d Helix Spiral with Surf command ?

Answer 1

[Paul]

I'm going to assume that the question means that the conditional density of r given theta is normal with exepectation mu = theta/2 and sigma = 2.5. Use the defnition of the conditional density function for continuous random variables. You will see that definition contains three terms. You're given two of them, solve for the third.

[Orr Streicher]

Thanks