# Function subset Get or set a subset of a matrix or string Usage: // retrieve subset: var subset = math.subset(value, index) // replace subset: var value = math.subset(value, index, replacement [, defaultValue]) Where: {Array | Matrix | String} value An array, matrix, or string {Index} index An index containing ranges for each dimension {*} replacement An array, matrix, or scalar {*} [defaultValue] Default value, filled in on new entries when the matrix is resized. If not provided, new matrix elements will be left undefined. ### Parameters Parameter | Type | Description --------- | ---- | ----------- ### Returns Type | Description ---- | ----------- | undefined