Calculate warm index and cold index

Description

Calculate warm index and cold index

Usage

wi(x)

ci(x)

Arguments

Value

A string vector of url links.

References

Kira, T. 1945. A new classification of climate in eastern Asia as the basis for agricultural geography, Hort. Inst. K,yoto Univ., Kyoto. (in Japanese) Warmth Index (WI) and Cold Index (CI) was proposed by Kira (1945), which is known closely related to the distribution of vegetation. Indices can are calculated by following equations. wi = sum (Ti - 5), where wi is Warm index, Ti (celsius) is mean temprature of each month in a year when Ti > 5. Indices can are calculated by following equations. wi = -sum (Ti - 5), where wi is Cold index, when Ti < 5.

Examples

temp <- c(-7.8, -7.2, -2.4, 5.2, 11.7, 16.5, 20.5, 21.1, 15.6, 8.8, 2.0, -4.1)
wi(temp)
ci(temp)
wi <- sum(c(0, 0, 0, 0.2, 6.7, 11.5, 15.5, 16.1, 10.6, 3.8, 0, 0))
ci <- sum(c(12.8, 12.2, 7.4, 0, 0, 0, 0, 0, 0, 0, 3.0, 9.1))