General Math Operations

Functions
double	kgsqmTocow (double x)
	Compute water column height.
double	calculateWeightedAverage (const double *values, const double *weights, size_t count)
	Compute the weighted average.
int	intcmp (const void *a, const void *b)
	Callback function for qsort to compare integers.

Detailed Description

Function Documentation

calculateWeightedAverage()

double calculateWeightedAverage	(	const double *	values,
		const double *	weights,
		size_t	count )

Compute the weighted average.

Compute the weighted arithmetic mean of count amount of values. Every value must be associated with a weight.

\[ \bar{x} = \frac{\sum_{i = 1}^{\textrm{count}}x_i \times w_i}{\sum_{i = 1}^{\textrm{count}}w_i} \]

Parameters

values	Values to average.
weights	Weights associated with values.
count	Size of arrays.

Returns

double Weighted arithmetic mean, NAN on error.

intcmp()

int intcmp	(	const void *	a,
		const void *	b )

Callback function for qsort to compare integers.

Parameters

a	Void-casted reference to first value of comparison.
b	Void-casted reference to second value of comparison.

Returns

int Negative value if a < b, 0 if a = b, positive value if a > b.

kgsqmTocow()

double kgsqmTocow

(

double

x

)

Compute water column height.

ECMWF distributes data in unit of kilogram per square meter. To allow easy integration with FORCE, the values are converted to water column height.

Parameters

x	Water vapor concentration in kilogram per square meter.

Returns

double Scaled value.