Create a double-precision complex floating-point vector (i.e., a one-dimensional ndarray).
var Complex128Vector = require( '@stdlib/ndarray/vector/complex128' );Returns a one-dimensional double-precision complex floating-point ndarray.
var numel = require( '@stdlib/ndarray/numel' );
var arr = new Complex128Vector();
// returns <ndarray>
var len = numel( arr );
// returns 0The function accepts the following options:
- order: specifies whether an ndarray is
'row-major'(C-style) or'column-major'(Fortran-style). Default:'row-major'. - mode: specifies how to handle indices which exceed array dimensions (see
ndarray). Default:'throw'. - readonly: boolean indicating whether an array should be read-only. Default:
false.
Returns a one-dimensional double-precision complex floating-point ndarray having a specified length.
var numel = require( '@stdlib/ndarray/numel' );
var arr = new Complex128Vector( 5 );
// returns <ndarray>
var len1 = numel( arr );
// returns 5Creates a one-dimensional double-precision complex floating-point ndarray from an array-like object or iterable.
var numel = require( '@stdlib/ndarray/numel' );
var arr = new Complex128Vector( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
// returns <ndarray>
var len1 = numel( arr );
// returns 3Returns a one-dimensional double-precision complex floating-point ndarray view of an ArrayBuffer.
var ArrayBuffer = require( '@stdlib/array/buffer' );
var numel = require( '@stdlib/ndarray/numel' );
var buf = new ArrayBuffer( 64 );
var arr1 = new Complex128Vector( buf );
// returns <ndarray>
var len1 = numel( arr1 );
// returns 4
var arr2 = new Complex128Vector( buf, 16 );
// returns <ndarray>
var len2 = numel( arr2 );
// returns 3
var arr3 = new Complex128Vector( buf, 16, 1 );
// returns <ndarray>
var len3 = numel( arr3 );
// returns 1var discreteUniform = require( '@stdlib/random/array/discrete-uniform' );
var sum = require( '@stdlib/blas/ext/sum' );
var map = require( '@stdlib/ndarray/map' );
var real = require( '@stdlib/complex/float64/real' );
var imag = require( '@stdlib/complex/float64/imag' );
var Complex128 = require( '@stdlib/complex/float64/ctor' );
var Complex128Vector = require( '@stdlib/ndarray/vector/complex128' );
// Create a vector containing random values:
var x = new Complex128Vector( discreteUniform( 20, 0, 100 ) );
// Compute the sum:
var v = sum( x );
console.log( v.get() );
// Define a function which applies a threshold to real and imaginary components:
function threshold( v ) {
if ( real( v ) > 10 && imag( v ) > 10 ) {
return v;
}
return new Complex128( 0.0, 0.0 );
}
// Apply threshold:
var y = map( x, threshold );
// Recompute the sum:
v = sum( y );
console.log( v.get() );