# blueWhiteRed: Blue-white-red color sequence In WGCNA: Weighted Correlation Network Analysis

 blueWhiteRed R Documentation

## Blue-white-red color sequence

### Description

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

### Usage

```blueWhiteRed(
n,
gamma = 1,
endSaturation = 1,
blueEnd = c(0.05 + (1-endSaturation) * 0.45 , 0.55 + (1-endSaturation) * 0.25, 1.00),
redEnd = c(1.0, 0.2 + (1-endSaturation) * 0.6, 0.6*(1-endSaturation)),
middle = c(1,1,1))
```

### Arguments

 `n` number of colors to be returned. `gamma` color change power. `endSaturation` a number between 0 and 1 giving the saturation of the colors that will represent the ends of the scale. Lower numbers mean less saturation (lighter colors). `blueEnd` vector of length 3 giving the RGB relative values (between 0 and 1) for the blue or negative end color. `redEnd` vector of length 3 giving the RGB relative values (between 0 and 1) for the red or positive end color. `middle` vector of length 3 giving the RGB relative values (between 0 and 1) for the middle of the scale.

### Details

The function returns a color vector that starts with blue, 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 blue 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.

### Value

A vector of colors of length `n`.

### Author(s)

Peter Langfelder

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

### Examples

```  par(mfrow = c(3, 1))
displayColors(blueWhiteRed(50));
title("gamma = 1")
displayColors(blueWhiteRed(50, 3));
title("gamma = 3")
displayColors(blueWhiteRed(50, 0.5));
title("gamma = 0.5")
```

WGCNA documentation built on Jan. 22, 2023, 1:34 a.m.