time-to-botec

README.md (4664B)

---

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 # sub2ind
 
 > Convert subscripts to a linear index.
 
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 ## Usage
 
 ```javascript
 var sub2ind = require( '@stdlib/ndarray/sub2ind' );
 ```
 
 #### sub2ind( shape, ...subscripts\[, options] )
 
 Converts subscripts to a linear index.
 
 ```javascript
 var shape = [ 2, 2 ];
 
 var idx = sub2ind( shape, 1, 0 );
 // returns 2
 ```
 
 The function supports the following `options`:
 
 -   `mode`: specifies how to handle subscripts which exceed array dimensions. The following modes are supported:
 
     -   `throw`: specifies that the function should throw an error when a subscript exceeds array dimensions.
     -   `wrap`: specifies that the function should wrap around subscripts exceeding array dimensions using modulo arithmetic.
     -   `clamp`: specifies that the function should set subscripts exceeding array dimensions to either `0` (minimum index) or the maximum index along a particular dimension.
 
     If provided a `mode` array, each array element corresponds to a dimension. If provided fewer modes than dimensions, the function reuses modes using modulo arithmetic. Default: `[ 'throw' ]`.
 
 -   `order`: specifies whether an array is `row-major` (C-style) or `column-major` (Fortran-style). Default: `'row-major'`.
 
 By default, the function assumes a row-major array. To return a linear index for a column-major array, set the `order` option.
 
 ```javascript
 var shape = [ 2, 2 ];
 var opts = {};
 
 opts.order = 'column-major';
 var idx = sub2ind( shape, 1, 0, opts );
 // returns 1
 ```
 
 By default, the function throws an `error` if provided subscripts which exceed array dimensions. To specify alternative behavior, set the `mode` option.
 
 ```javascript
 var shape = [ 2, 2 ];
 var opts = {};
 
 opts.mode = 'wrap';
 var idx = sub2ind( shape, -2, 0, opts );
 // returns 0
 
 opts.mode = 'clamp';
 idx = sub2ind( shape, 10, 10, opts );
 // returns 3
 ```
 
 To specify separate modes for each dimension, provide a `mode` array.
 
 ```javascript
 var shape = [ 2, 2, 2 ];
 var opts = {
     'mode': [
         'wrap',
         'clamp'
     ]
 };
 
 var idx = sub2ind( shape, -2, 10, -1, opts );
 // returns 3
 ```
 
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 ## Examples
 
 <!-- eslint no-undef: "error" -->
 
 ```javascript
 var numel = require( '@stdlib/ndarray/base/numel' );
 var sub2ind = require( '@stdlib/ndarray/sub2ind' );
 
 var shape = [ 3, 3, 3 ];
 var len = numel( shape );
 
 var arr = [];
 var i;
 for ( i = 0; i < len; i++ ) {
     arr.push( i );
 }
 
 var opts = {
     'order': 'column-major'
 };
 
 console.log( '' );
 console.log( 'Dimensions: %s.', shape.join( 'x' ) );
 console.log( 'View:' );
 console.log( '' );
 
 var slice;
 var idx;
 var row;
 var j;
 var k;
 for ( k = 0; k < shape[ 2 ]; k++ ) {
     slice = 'A[:,:,'+k+'] = ';
     console.log( slice );
     for ( i = 0; i < shape[ 0 ]; i++ ) {
         row = '  ';
         for ( j = 0; j < shape[ 1 ]; j++ ) {
             idx = sub2ind( shape, i, j, k, opts );
             row += arr[ idx ];
             if ( j < shape[ 1 ]-1 ) {
                 row += ', ';
             }
         }
         console.log( row );
     }
     console.log( '' );
 }
 ```
 
 </section>
 
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