ee.Array.tan

  • Array.tan() computes the tangent of each element in an input Array, returning an Array.

  • The function takes one argument: the input Array.

  • Examples demonstrate the usage in JavaScript and Python, including plotting the tangent function.

 On an element-wise basis, computes the tangent of the input in radians.

UsageReturns
Array.tan()Array
ArgumentTypeDetails
this: inputArrayThe input array.

Examples

Code Editor (JavaScript)

var π = Math.PI;
print(ee.Array([-π / 4]).tan());  // [Almost -1]
print(ee.Array([0]).tan());  // [0]
print(ee.Array([π / 4]).tan());  // [Almost 1]

var start = -π / 3;
var end = π / 3;
var points = ee.Array(ee.List.sequence(start, end, null, 50));
var values = points.tan();

// Plot tan() defined above.
var chart = ui.Chart.array.values(values, 0, points)
    .setOptions({
      viewWindow: {min: start, max: end},
      hAxis: {
        title: 'x',
        viewWindowMode: 'maximized',
        ticks: [
          {v: start, f: '-π / 3'},
          {v: 0, f: 0},
          {v: end, f: 'π / 3'}]
      },
      vAxis: {
        title: 'tan(x)',
        ticks: [
          {v: -Math.sqrt(3), f: '-√3'},
          {v: 0},
          {v: Math.sqrt(3), f: '√3'}]
      },
      lineWidth: 1,
      pointSize: 0,
    });
print(chart);

Python setup

See the Python Environment page for information on the Python API and using geemap for interactive development.

import ee
import geemap.core as geemap

Colab (Python)

import math
import altair as alt
import pandas as pd

π = math.pi
display(ee.Array([-π / 4]).tan())  # [Almost -1]
display(ee.Array([0]).tan())  # [0]
display(ee.Array([π / 4]).tan())  # [Almost 1]

start = -π / 3
end = π / 3
points = ee.Array(ee.List.sequence(start, end, None, 50))
values = points.tan()

df = pd.DataFrame({'x': points.getInfo(), 'tan(x)': values.getInfo()})

# Plot tan() defined above.
alt.Chart(df).mark_line().encode(
    x=alt.X('x', axis=alt.Axis(values=[start, 0, end])),
    y=alt.Y('tan(x)', axis=alt.Axis(values=[-math.sqrt(3), 0, math.sqrt(3)]))
)