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Calculate the minimum value of a double-precision floating-point strided array.
import dmin from 'https://cdn.jsdelivr.net/gh/stdlib-js/stats-base-dmin@esm/index.mjs';
Computes the minimum value of a double-precision floating-point strided array x
.
import Float64Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-float64@esm/index.mjs';
var x = new Float64Array( [ 1.0, -2.0, 2.0 ] );
var N = x.length;
var v = dmin( N, x, 1 );
// returns -2.0
The function has the following parameters:
- N: number of indexed elements.
- x: input
Float64Array
. - stride: index increment for
x
.
The N
and stride
parameters determine which elements in x
are accessed at runtime. For example, to compute the minimum value of every other element in x
,
import Float64Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-float64@esm/index.mjs';
import floor from 'https://cdn.jsdelivr.net/gh/stdlib-js/math-base-special-floor@esm/index.mjs';
var x = new Float64Array( [ 1.0, 2.0, 2.0, -7.0, -2.0, 3.0, 4.0, 2.0 ] );
var N = floor( x.length / 2 );
var v = dmin( N, x, 2 );
// returns -2.0
Note that indexing is relative to the first index. To introduce an offset, use typed array
views.
import Float64Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-float64@esm/index.mjs';
import floor from 'https://cdn.jsdelivr.net/gh/stdlib-js/math-base-special-floor@esm/index.mjs';
var x0 = new Float64Array( [ 2.0, 1.0, 2.0, -2.0, -2.0, 2.0, 3.0, 4.0 ] );
var x1 = new Float64Array( x0.buffer, x0.BYTES_PER_ELEMENT*1 ); // start at 2nd element
var N = floor( x0.length / 2 );
var v = dmin( N, x1, 2 );
// returns -2.0
Computes the minimum value of a double-precision floating-point strided array using alternative indexing semantics.
import Float64Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-float64@esm/index.mjs';
var x = new Float64Array( [ 1.0, -2.0, 2.0 ] );
var N = x.length;
var v = dmin.ndarray( N, x, 1, 0 );
// returns -2.0
The function has the following additional parameters:
- offset: starting index for
x
.
While typed array
views mandate a view offset based on the underlying buffer
, the offset
parameter supports indexing semantics based on a starting index. For example, to calculate the minimum value for every other value in x
starting from the second value
import Float64Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-float64@esm/index.mjs';
import floor from 'https://cdn.jsdelivr.net/gh/stdlib-js/math-base-special-floor@esm/index.mjs';
var x = new Float64Array( [ 2.0, 1.0, 2.0, -2.0, -2.0, 2.0, 3.0, 4.0 ] );
var N = floor( x.length / 2 );
var v = dmin.ndarray( N, x, 2, 1 );
// returns -2.0
- If
N <= 0
, both functions returnNaN
.
<!DOCTYPE html>
<html lang="en">
<body>
<script type="module">
import randu from 'https://cdn.jsdelivr.net/gh/stdlib-js/random-base-randu@esm/index.mjs';
import round from 'https://cdn.jsdelivr.net/gh/stdlib-js/math-base-special-round@esm/index.mjs';
import Float64Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-float64@esm/index.mjs';
import dmin from 'https://cdn.jsdelivr.net/gh/stdlib-js/stats-base-dmin@esm/index.mjs';
var x;
var i;
x = new Float64Array( 10 );
for ( i = 0; i < x.length; i++ ) {
x[ i ] = round( (randu()*100.0) - 50.0 );
}
console.log( x );
var v = dmin( x.length, x, 1 );
console.log( v );
</script>
</body>
</html>
@stdlib/stats-base/dmax
: calculate the maximum value of a double-precision floating-point strided array.@stdlib/stats-base/dnanmin
: calculate the minimum value of a double-precision floating-point strided array, ignoring NaN values.@stdlib/stats-base/min
: calculate the minimum value of a strided array.@stdlib/stats-base/smin
: calculate the minimum value of a single-precision floating-point strided array.
This package is part of stdlib, a standard library with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.
See LICENSE.
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