# greenWhiteRed: Green-white-red color sequence

Description Usage Arguments Details Value Author(s) See Also Examples

### Description

Generate a green-white-red color sequence of a given length.

### Usage

 `1` ```greenWhiteRed(n, gamma = 1, warn = TRUE) ```

### Arguments

 `n` number of colors to be returned `gamma` color change power `warn` logical: should the user be warned that this function produces a palette unsuitable for people with most common color blindness?

### Details

The function returns a color vector that starts with green, gradually turns into white and then to red. The power `gamma` can be used to control the behaviour of the quarter- and three quarter-values (between green and white, and white and red, respectively). Higher powers will make the mid-colors more white, while lower powers will make the colors more saturated, respectively.

Typical use of this function is to produce (via function `numbers2colors`) a color representation of numbers within a symmetric interval around 0, for example, the interval [-1, 1]. Note though that since green and red are not distinguishable by people with the most common type of color blindness, we recommend using the analogous palette returned by the function `blueWhiteRed`.

### Value

A vector of colors of length `n`.

Peter Langfelder

### See Also

`blueWhiteRed` for a color sequence more friendly to people with the most common type of color blindness;

`numbers2colors` for a function that produces a color representation for continuous numbers.

### Examples

 ```1 2 3 4 5 6 7``` ``` par(mfrow = c(3, 1)) displayColors(greenWhiteRed(50)); title("gamma = 1") displayColors(greenWhiteRed(50, 3)); title("gamma = 3") displayColors(greenWhiteRed(50, 0.5)); title("gamma = 0.5") ```

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