sample_cdf

On this page	* Overview * Usage

Overview

overview

Use this function to sample values from a CDF array created with the create_cdf function. See create_cdf for more information.

See the create_cdf function docs for example code.

Usage

usage

int  sample_cdf(float cdf[], float uniform_rand)

Returns the index of the sampled CDF.

void  sample_cdf(float cdf[], float uniform_rand, int &index, float &x)

Writes the index of the sampled CDF and value to output arguments.

void  sample_cdf(float cdf[], float uniform_rand, int &index, float &x, float &pdf)

Writes the index of the sampled CDF, the sampled value, and the corresponding PDF to output arguments.

cdf

The CDF to sample from (create this using create_cdf).

uniform_rand

A uniform random variable (must be in range 0 to 1).

&index

Outputs the index of the sampled CDF element.

&x

Outputs the value of the sampled CDF element.

&pdf

Outputs the PDF of the sampled CDF element.

Returns

The first form returns the index of the sampled value. The other forms write the index to an output argument instead.