redgreencmap

Create red and green colormap

Syntax

redgreencmap(length)

redgreencmap(length,'Interpolation',interpMethod)

Description

redgreencmap(length) returns a length-by-3 matrix containing a red and green colormap. Low values are bright green, values in the center of the map are black, and high values are red.

redgreencmap(length,'Interpolation',interpMethod) specifies the algorithm to use for color interpolation.

Examples

Generate Spatial Image and Change Colormap of Microarray Data

Read in a sample GPR file.

madata = gprread('mouse_a1wt.gpr');

Plot the median foreground intensity for the 635 nm channel.

maimage(madata,'F635 Median')

Alternatively, create a similar plot using more basic graphics commands.

F635Median = magetfield(madata,'F635 Median');
figure
imagesc(F635Median(madata.Indices));

Change the colormap to one of the preset colors (for details, see map) and add a color bar.

colormap('bone')
colorbar 

Change the colormap to red and green.

colormap(redgreencmap)

You can also change the color interpolation method.

colormap(redgreencmap(256,'Interpolation','cubic'))

Reset the colormap to the default value.

colormap('default')

Input Arguments

length — Number of colors in colormap

[] | nonnegative integer

Number of colors in the colormap, specified as empty [] or a nonnegative integer. If length is empty, the function automatically sets the value to the length of the colormap of the current figure.

Example: 64

Data Types: double

interpMethod — Interpolation algorithm

'sigmoid' (default) | 'linear' | 'quadratic' | 'cubic'

Interpolation algorithm for color interpolation, specified as 'sigmoid' (which uses tanh), 'linear', 'quadratic', or 'cubic'.

Example: 'cubic'

Data Types: char | string

Version History

Introduced before R2006a