## createcolormap

version 0.2 (1.74 MB) by
This function allows to create colormap Nx3 array (RGB) with an arbitrary combination of colors.

Updated 9 Oct 2021

From GitHub

## createcolormap.m

This function allows to create colormap Nx3 array (RGB) with an arbitrary combination of colors. RGB values between the specified colors will be smoothly connected by linear interpolation.

## Example

```cmap = createcolormap(C);
cmap = createcolormap(n,C);
cmap = createcolormap(colorA, colorB);
cmap = createcolormap(n, colorA, colorB);
cmap = createcolormap(colorA, colorB, colorC, colorD, ...);
cmap = createcolormap(n, colorA, colorB, colorC, colorD, ...);```

where `n` is the number of segments for the output color scheme, and `C` is the RGB matrix of color junctions.

## Usage

• blue-white-red (polar)

```b = [0,0,1];
w = [1,1,1];
r = [1,0,0];

bwr = createcolormap(b,w,r); % 256x3 array

colormap(bwr)
colorbar```

If you want to use dark blue and red colors, try below:

```b = [0.0,0.0,0.5];
w = [1.0,1.0,1.0];
r = [0.5,0.0,0.0];

bwr = createcolormap(b,w,r); % 256x3 array

colormap(bwr)
colorbar```

To create a more discrete color structure, input the number of elements in the first argument as shown below.

`bwr = createcolormap(16,b,w,r); % 16x3 array `
• more complicated combination

```colorA = [0.0,1.0,0.0];
colorB = [1.0,0.5,0.5];
colorC = [0.5,0.5,0.5];
colorD = [1.0,1.0,0.0];

cmap = createcolormap(64,colorA,colorB,colorC,colorD); % 64x3 array

surf(peaks);
colormap(cmap);
colorbar;```
• RGB matrix

```cmap = createcolormap(rand(10,3)); % 10 random colors

surf(peaks);
colormap(cmap);
colorbar;```

MIT

## Author

Takuya Miyashita
Disaster Prevention Research Institute, Kyoto University

## Update

v0.1 2021/10/01
v0.2 2021/10/09

### Cite As

Takuya Miyashita (2022). createcolormap (https://github.com/hydrocoast/createcolormap/releases/tag/v0.2), GitHub. Retrieved .

##### MATLAB Release Compatibility
Created with R2021b
Compatible with any release
##### Platform Compatibility
Windows macOS Linux