time-to-botec

README.md (4505B)

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 # ind2sub
 
 > Convert a linear index to an array of subscripts.
 
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 ## Usage
 
 ```javascript
 var ind2sub = require( '@stdlib/ndarray/ind2sub' );
 ```
 
 #### ind2sub( shape, idx\[, options] )
 
 Converts a linear index to an array of subscripts.
 
 ```javascript
 var shape = [ 2, 2 ];
 
 var s = ind2sub( shape, 2 );
 // returns [ 1, 0 ]
 ```
 
 The function supports the following `options`:
 
 -   `mode`: specifies how to handle a linear index which exceeds array dimensions. The following modes are supported:
 
     -   `throw`: specifies that the function should throw an error when a linear index exceeds array dimensions.
     -   `wrap`: specifies that the function should wrap around a linear index exceeding array dimensions using modulo arithmetic.
     -   `clamp`: specifies that the function should set a linear index exceeding array dimensions to either `0` (minimum linear index) or the maximum linear index.
 
 -   `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 subscripts for a column-major array, set the `order` option.
 
 ```javascript
 var shape = [ 2, 2 ];
 var opts = {};
 
 opts.order = 'column-major';
 var s = ind2sub( shape, 1, opts );
 // returns [ 1, 0 ]
 ```
 
 By default, the function throws an `error` if provided a linear index which exceeds array dimensions. To specify alternative behavior, set the `mode` option.
 
 ```javascript
 var shape = [ 2, 2 ];
 var opts = {};
 
 opts.mode = 'wrap';
 var s = ind2sub( shape, -5, opts );
 // returns [ 1, 1 ]
 
 opts.mode = 'clamp';
 s = ind2sub( shape, 7, opts );
 // returns [ 1, 1 ]
 ```
 
 #### ind2sub.assign( shape, idx\[, options], out )
 
 Converts a linear index to an array of subscripts and assigns results to a provided output array.
 
 ```javascript
 var shape = [ 2, 2 ];
 var out = [ 0, 0 ];
 
 var subscripts = ind2sub.assign( shape, 1, out );
 // returns [ 0, 1 ]
 
 var bool = ( subscripts === out );
 // returns true
 ```
 
 The function accepts the same `options` as above.
 
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 ## Examples
 
 <!-- eslint no-undef: "error" -->
 
 ```javascript
 var numel = require( '@stdlib/ndarray/base/numel' );
 var ind2sub = require( '@stdlib/ndarray/ind2sub' );
 
 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 (subscripts):' );
 console.log( '' );
 
 var row;
 var s;
 
 row = '  ';
 for ( i = 0; i < len; i++ ) {
     s = ind2sub( shape, i, opts );
     row += '(' + s.join( ',' ) + ')';
     if ( (i+1)%shape[0] === 0 ) {
         console.log( row );
         row = '  ';
     } else {
         row += ', ';
     }
     if ( (i+1)%(shape[0]*shape[1]) === 0 ) {
         console.log( '' );
     }
 }
 ```
 
 </section>
 
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