ee.Array.tan

以元素为单位计算以弧度表示的输入的正切值。

用法返回
Array.tan()数组
参数类型详细信息
此：input数组输入数组。

示例

代码编辑器 (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 设置

如需了解 Python API 和如何使用 geemap 进行交互式开发，请参阅 Python 环境页面。

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)]))
)