time-to-botec

README.md (6350B)

---

 <!--
 
 @license Apache-2.0
 
 Copyright (c) 2018 The Stdlib Authors.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at
 
    http://www.apache.org/licenses/LICENSE-2.0
 
 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 
 -->
 
 # Min and Max View Buffer Indices
 
 > Compute the minimum and maximum linear indices in an underlying data buffer which are accessible to an array view.
 
 <!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
 
 <section class="intro">
 
 </section>
 
 <!-- /.intro -->
 
 <!-- Package usage documentation. -->
 
 <section class="usage">
 
 ## Usage
 
 ```javascript
 var minmaxViewBufferIndex = require( '@stdlib/ndarray/base/minmax-view-buffer-index' );
 ```
 
 #### minmaxViewBufferIndex( shape, strides, offset )
 
 Computes the minimum and maximum linear indices in an underlying data buffer which are accessible to an array view.
 
 ```javascript
 // Array shape:
 var shape = [ 2, 2 ];
 
 // Stride array:
 var strides = [ 2, 1 ];
 
 // Index offset which specifies the location of the first indexed value:
 var offset = 0;
 
 var idx = minmaxViewBufferIndex( shape, strides, offset );
 // returns [ 0, 3 ]
 ```
 
 #### minmaxViewBufferIndex.assign( shape, strides, offset, out )
 
 Computes the minimum and maximum linear indices in an underlying data buffer which are accessible to an array view and assigns results to a provided output array.
 
 ```javascript
 var shape = [ 2, 2 ];
 var strides = [ -1, -2 ];
 var offset = 3;
 
 var out = [ 0, 0 ];
 var idx = minmaxViewBufferIndex.assign( shape, strides, offset, out );
 // returns [ 0, 3 ]
 
 var bool = ( idx === out );
 // returns true
 ```
 
 </section>
 
 <!-- /.usage -->
 
 <!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
 
 <section class="notes">
 
 </section>
 
 <!-- /.notes -->
 
 <!-- Package usage examples. -->
 
 <section class="examples">
 
 ## Examples
 
 <!-- eslint no-undef: "error" -->
 
 ```javascript
 var discreteUniform = require( '@stdlib/random/base/discrete-uniform' );
 var shape2strides = require( '@stdlib/ndarray/base/shape2strides' );
 var strides2offset = require( '@stdlib/ndarray/base/strides2offset' );
 var randu = require( '@stdlib/random/base/randu' );
 var minmaxViewBufferIndex = require( '@stdlib/ndarray/base/minmax-view-buffer-index' );
 
 var strides;
 var offset;
 var shape;
 var idx;
 var i;
 var j;
 
 shape = [ 0, 0, 0 ];
 
 for ( i = 0; i < 100; i++ ) {
     // Generate a random array shape:
     shape[ 0 ] = discreteUniform( 1, 10 );
     shape[ 1 ] = discreteUniform( 1, 10 );
     shape[ 2 ] = discreteUniform( 1, 10 );
 
     // Generate strides:
     if ( randu() < 0.5 ) {
         strides = shape2strides( shape, 'row-major' );
     } else {
         strides = shape2strides( shape, 'column-major' );
     }
     j = discreteUniform( 0, shape.length-1 );
     strides[ j ] *= ( randu() < 0.5 ) ? -1 : 1;
 
     // Compute the index offset:
     offset = strides2offset( shape, strides ) + 25; // include a view offset
 
     // Compute the minimum and maximum linear indices:
     idx = minmaxViewBufferIndex( shape, strides, offset );
     console.log( 'Shape: %s. Strides: %s. Offset: %d. Min idx: %d. Max idx: %d.', shape.join( 'x' ), strides.join( ',' ), offset, idx[ 0 ], idx[ 1 ] );
 }
 ```
 
 </section>
 
 <!-- /.examples -->
 
 <!-- C interface documentation. -->
 
 * * *
 
 <section class="c">
 
 ## C APIs
 
 <!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
 
 <section class="intro">
 
 </section>
 
 <!-- /.intro -->
 
 <!-- C usage documentation. -->
 
 <section class="usage">
 
 ### Usage
 
 ```c
 #include "stdlib/ndarray/base/minmax_view_buffer_index.h"
 ```
 
 #### stdlib_ndarray_minmax_view_buffer_index( ndims, \*shape, \*strides, offset, \*out )
 
 Computes the minimum and maximum linear indices (in bytes) in an underlying data buffer accessible to an array view.
 
 ```c
 int64_t ndims = 2;
 int64_t shape[] = { 10, 10 };
 int64_t strides[] = { 10, 1 };
 int64_t offset = 0;
 int64_t out[ 2 ];
 
 stdlib_ndarray_minmax_view_buffer_index( ndims, shape, strides, offset, out );
 
 int64_t min = out[ 0 ];
 // returns 0
 
 int64_t max = out[ 1 ];
 // returns 99
 ```
 
 The function accepts the following arguments:
 
 -   **ndims**: `[in] int64_t` number of dimensions.
 -   **shape**: `[in] int64_t*` array shape (dimensions).
 -   **strides**: `[in] int64_t*` array strides (in bytes).
 -   **offset**: `[in] int64_t` index offset.
 -   **out**: `[out] int64_t*` two-element output array.
 
 ```c
 int8_t stdlib_ndarray_minmax_view_buffer_index( int64_t ndims, int64_t *shape, int64_t *strides, int64_t offset, int64_t *out );
 ```
 
 </section>
 
 <!-- /.usage -->
 
 <!-- C API usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
 
 <section class="notes">
 
 </section>
 
 <!-- /.notes -->
 
 <!-- C API usage examples. -->
 
 <section class="examples">
 
 ### Examples
 
 ```c
 #include "stdlib/ndarray/base/minmax_view_buffer_index.h"
 #include <stdio.h>
 #include <inttypes.h>
 
 int main() {
     int64_t ndims = 2;
     int64_t shape[] = { 10, 10 };
     int64_t strides[] = { 10, 1 };
     int64_t offset = 0;
     int64_t out[ 2 ];
 
     stdlib_ndarray_minmax_view_buffer_index( ndims, shape, strides, offset, out );
 
     printf( "min: %"PRId64"\n", out[ 0 ] );
     printf( "max: %"PRId64"\n", out[ 1 ] );
 }
 ```
 
 </section>
 
 <!-- /.examples -->
 
 </section>
 
 <!-- /.c -->
 
 <!-- Section to include cited references. If references are included, add a horizontal rule *before* the section. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
 
 <section class="references">
 
 </section>
 
 <!-- /.references -->
 
 <!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
 
 <section class="links">
 
 </section>
 
 <!-- /.links -->