ee.Array.log

Berdasarkan elemen demi elemen, menghitung logaritma natural dari input.

Penggunaan	Hasil
Array.log()	Array

Argumen	Jenis	Detail
ini: input	Array	Array input.

Contoh

Code Editor (JavaScript)

print(ee.Array([Math.pow(Math.E, -1), 1, Math.E]).log());  // [-1,0,1]

var start = 0.1;
var end = 6;
var points = ee.Array(ee.List.sequence(start, end, null, 50));
var values = points.log();

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

Penyiapan Python

Lihat halaman Lingkungan Python untuk mengetahui informasi tentang Python API dan penggunaan geemap untuk pengembangan interaktif.

import ee
import geemap.core as geemap

Colab (Python)

import math
import altair as alt
import pandas as pd

display(ee.Array([pow(math.e, -1), 1, math.e]).log())  # [-1,0,1]

start = 0.1
end = 6
points = ee.Array(ee.List.sequence(start, end, None, 50))
values = points.log()

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

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