R: Resize Matrix

resize_matrix {rayshader} | R Documentation

## Resize Matrix

### Description

Resizes a matrix (preserving contents) by specifying the desired output dimensions or a scaling factor.

### Usage

    resize_matrix(
      heightmap,
      scale = 1,
      width = NULL,
      height = NULL,
      method = "bilinear"
    )

### Arguments

`heightmap` | The elevation matrix.
`scale` | Default '0.5'. The amount to scale down the matrix. Scales using bilinear interpolation.
`width` | Default 'NULL'. Alternative to 'scale' argument. The desired output width. If 'width' is less than 1, it will be interpreted as a scaling factor– e.g. 0.5 would halve the resolution for the width.
`height` | Default 'NULL'. Alternative to 'scale' argument. The desired output width. If 'height' is less than 1, it will be interpreted as a scaling factor– e.g. 0.5 would halve the resolution for the height.
`method` | Default 'bilinear'. Method of interpolation. Alteratively 'cubic', which is slightly smoother, although current implementation slightly scales the image.

### Examples

    #Reduce the size of the monterey bay dataset by half

    montbaysmall = resize_matrix(montereybay, scale=0.5)
    montbaysmall %>%
     sphere_shade() %>%
     plot_map()

    #Reduce the size of the monterey bay dataset from 540x540 to 100x100
    montbaysmall = resize_matrix(montereybay, width = 100, height = 100)
    montbaysmall %>%
     sphere_shade() %>%
     plot_map()

    #Increase the size of the volcano dataset 3x
    volcanobig = resize_matrix(volcano, scale=3)
    volcanobig %>%
     sphere_shade() %>%
     plot_map()

    #Increase the size of the volcano dataset 2x, using cubic interpolation
    volcanobig = resize_matrix(volcano, scale=3, method="cubic")
    volcanobig %>%
     sphere_shade() %>%
     plot_map()

[Package rayshader version 0.19.2 Index]