### Syntax

`cmat = sw_multicolor(vmat, cmap, clim, {ncol}, {flipud})`

### Description

`cmat = sw_multicolor(vmat, cmap, clim, {ncol}, {flipud})`

takes 2D
matrices and overlays them and generating RGB color additively from the
user defined colors correspond to each map. The function is used in
sw_plotspec when multiple correlation functions are overlayed on the
same plot.

### Examples

In this example we create two intensity maps stored in the square
matrices `A`

and `B`

(linearly changing intensity along and axes
respectively, intensity ranging between -2 and 2). We plot these
intensity maps by converting them to RGB colors using the inline function
`rgbMap`

and the Matlab built-in function `image`

. We use `sw_multicolor`

function to additively combine `A`

and `B`

and providing a color
saturation value of 1 (and lowest value of -1). It is clearly visible on
the resulting plot of `C`

that it is white where both `A`

and `B`

has
zero value (or below the lowest color value of -1) and it is red+green
where both `A`

and `B`

are saturated.

```
rgbMap = @(mat,RGB,clim)bsxfun(@plus,ones(1,1,3),bsxfun(@times,(mat-clim(1))/diff(clim),permute(RGB(:)-1,[2 3 1])));
red = [1;0;0];
green = [0;1;0];
[A,B] = ndgrid(linspace(-2,2,501),linspace(-2,2,501));
C = sw_multicolor(cat(3,A,B),[red green],[-1 1]);
figure
subplot(1,3,1)
image(rgbMap(A,red,[-1 1]))
title A
subplot(1,3,2)
image(rgbMap(B,green,[-1 1]))
title B
subplot(1,3,3)
image(C)
title C=A+B
```

### Input Arguments

`vMat`

- Matrix that contains the input 2D intensity data, dimensions are , where each intensity map has a dimension of .
`cMap`

- Defines the color map that maps intensity values within the
`cLim`

limits to colors, can be the following types:`matrix`

Matrix of RGB colors, where each column corresponds to an RGB triplet. The dimension of the matrix is and the th color corresponds to the color of the th intensity map in the`vMat`

stack.`cell`

Cell of colormap functions. For example`{@copper @gray}`

.

`cLim`

- Defines the maximum and minimum intensity values that the given color
map will span. Values in vMat smaller than the minimum and larger than
the maximum will be shown with the minimum and maximum color in the
colormap respectively.
`cLim`

is a row vector with 2 elements.. `nCol`

- Number of colors in the colormap. Optional, default value is 100.
`flipud`

- If
`true`

the given colormaps are inverted. Optional, default value is`false`

.

### Output Arguments

`cMat`

- Matrix that contains the RGB image, with dimensions of . The image can be shown using the
`image`

built-in Matlab command.