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Create an iterator which generates a triangle wave.
A triangle waveform is represented by the following equation
where τ
is the period, a
is the peak amplitude, and φ
is the phase offset.
npm install @stdlib/simulate-iter-triangle-wave
var iterTriangleWave = require( '@stdlib/simulate-iter-triangle-wave' );
Returns an iterator which generates a triangle wave.
var it = iterTriangleWave();
// returns <Object>
var v = it.next().value;
// returns <number>
v = it.next().value;
// returns <number>
v = it.next().value;
// returns <number>
// ...
The returned iterator protocol-compliant object has the following properties:
-
next: function which returns an iterator protocol-compliant object containing the next iterated value (if one exists) assigned to a
value
property and adone
property having aboolean
value indicating whether the iterator is finished. - return: function which closes an iterator and returns a single (optional) argument in an iterator protocol-compliant object.
The function supports the following options
:
-
period: period (i.e., the number of iterations before a waveform repeats). Default:
10
. -
amplitude: peak amplitude. Default:
1.0
. -
offset: phase offset (in units of iterations; zero-based). A negative offset translates a waveform to the left. A positive offset translates a waveform to the right. Default:
0
. -
iter: number of iterations. Default:
1e308
.
By default, the function returns an iterator which generates a triangle wave that repeats every 10
iterations. To specify an alternative period, set the period
option.
var opts = {
'period': 4
};
var it = iterTriangleWave( opts );
// returns <Object>
var v = it.next().value;
// returns 0.0
v = it.next().value;
// returns 1.0
v = it.next().value;
// returns 0.0
v = it.next().value;
// returns -1.0
v = it.next().value;
// returns 0.0
// ...
To adjust at what point the iterator begins in the waveform cycle, set the phase offset
option. For example, to translate the waveform to the left,
var opts = {
'period': 4,
'offset': -1
};
var it = iterTriangleWave( opts );
// returns <Object>
var v = it.next().value;
// returns 1.0
v = it.next().value;
// returns 0.0
v = it.next().value;
// returns -1.0
v = it.next().value;
// returns 0.0
v = it.next().value;
// returns 1.0
// ...
To translate the waveform to the right,
var opts = {
'period': 4,
'offset': 1
};
var it = iterTriangleWave( opts );
// returns <Object>
var v = it.next().value;
// returns -1.0
v = it.next().value;
// returns 0.0
v = it.next().value;
// returns 1.0
v = it.next().value;
// returns 0.0
v = it.next().value;
// returns -1.0
// ...
By default, the function returns an infinite iterator (i.e., an iterator which never ends). To limit the number of iterations, set the iter
option.
var opts = {
'iter': 2
};
var it = iterTriangleWave( opts );
// returns <Object>
var v = it.next().value;
// returns <number>
v = it.next().value;
// returns <number>
var bool = it.next().done;
// returns true
- If an environment supports
Symbol.iterator
, the returned iterator is iterable.
var iterTriangleWave = require( '@stdlib/simulate-iter-triangle-wave' );
// Create an iterator:
var opts = {
'period': 10,
'amplitude': 10.0,
'offset': -5,
'iter': 100
};
var it = iterTriangleWave( opts );
// Perform manual iteration...
var v;
while ( true ) {
v = it.next();
if ( v.done ) {
break;
}
console.log( v.value );
}
-
@stdlib/simulate-iter/pulse
: create an iterator which generates a pulse waveform. -
@stdlib/simulate-iter/sawtooth-wave
: create an iterator which generates a sawtooth wave. -
@stdlib/simulate-iter/sine-wave
: create an iterator which generates a sine wave. -
@stdlib/simulate-iter/square-wave
: create an iterator which generates a square wave.
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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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