# demresize documentation

demresize works like imresize, but also resizes corresponding map coordinates.

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## Syntax

```[Zr,xr,yr] = demresize(Z,x,y,sc)
[Zr,xr,yr] = demresize(...,'method')
[Zr,xr,yr] = demresize(...,'Name',Value,...)```

## Description

[Zr,xr,yr] = demresize(Z,x,y,sc) resizes Z using imresize, and corresponding vector or 2D grid coordinates x and y to a scalar scale sc.

[Zr,xr,yr] = demresize(...,'method') specifies an interpolation method. Default is 'bicubic'.

[Zr,xr,yr] = demresize(...,'Name',Value,...) specifies any input name-value pairs accepted by imresize.

## Example:

Consider this 20x20 grid:

```[X,Y,Z] = peaks(20);
X = X+10; % (for clear distinction from y)

figure
imagescn(X,Y,Z)
```

These black dots mark the center points of each pixel in the 20x20 grid:

```hold on
plot(X,Y,'k.')
```

Let's suppose you want to resize the grid to 1/3 of its original grid resolution. Here's how you would do that:

```[Zr,Xr,Yr] = demresize(Z,X,Y,1/3);

% Plot as scatter circles with black edge markers:
scatter(Xr(:),Yr(:),100,Zr(:),'filled','markeredgecolor','k')
```

Or if you prefer to see the new grid as its own imagescn plot:

```figure
imagescn(Xr,Yr,Zr)
```

## Author Info

This function is part of the Climate Data Toolbox for Matlab. The function and supporting documentation were written by Chad A. Greene of NASA's Jet Propulsion Laboratory.