如何在R ggplot2中更改geom_tile的调色板
我有以下数据用于绘制ggplot2的geom_tile：
ddf = structure(list(yy = c(60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L, 60L, 61L, 62L, 63L, 64L, 65L, 66L, 67L,
68L, 69L, 70L, 71L, 72L), xx = structure(c(1L, 1L, 1L, 1L, 1L,
1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L,
2L, 2L, 2L, 2L, 2L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L,
3L, 3L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 5L,
5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L, 6L, 6L, 6L, 6L,
6L, 6L, 6L, 6L, 6L, 6L, 6L, 6L, 6L, 7L, 7L, 7L, 7L, 7L, 7L, 7L,
7L, 7L, 7L, 7L, 7L, 7L, 8L, 8L, 8L, 8L, 8L, 8L, 8L, 8L, 8L, 8L,
8L, 8L, 8L, 9L, 9L, 9L, 9L, 9L, 9L, 9L, 9L, 9L, 9L, 9L, 9L, 9L,
10L, 10L, 10L, 10L, 10L, 10L, 10L, 10L, 10L, 10L, 10L, 10L, 10L,
11L, 11L, 11L, 11L, 11L, 11L, 11L, 11L, 11L, 11L, 11L, 11L, 11L,
12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L,
13L, 13L, 13L, 13L, 13L, 13L, 13L, 13L, 13L, 13L, 13L, 13L, 13L,
14L, 14L, 14L, 14L, 14L, 14L, 14L, 14L, 14L, 14L, 14L, 14L, 14L,
15L, 15L, 15L, 15L, 15L, 15L, 15L, 15L, 15L, 15L, 15L, 15L, 15L,
16L, 16L, 16L, 16L, 16L, 16L, 16L, 16L, 16L, 16L, 16L, 16L, 16L,
17L, 17L, 17L, 17L, 17L, 17L, 17L, 17L, 17L, 17L, 17L, 17L, 17L,
18L, 18L, 18L, 18L, 18L, 18L, 18L, 18L, 18L, 18L, 18L, 18L, 18L,
19L, 19L, 19L, 19L, 19L, 19L, 19L, 19L, 19L, 19L, 19L, 19L, 19L,
20L, 20L, 20L, 20L, 20L, 20L, 20L, 20L, 20L, 20L, 20L, 20L, 20L,
21L, 21L, 21L, 21L, 21L, 21L, 21L, 21L, 21L, 21L, 21L, 21L, 21L,
22L, 22L, 22L, 22L, 22L, 22L, 22L, 22L, 22L, 22L, 22L, 22L, 22L,
23L, 23L, 23L, 23L, 23L, 23L, 23L, 23L, 23L, 23L, 23L, 23L, 23L,
24L, 24L, 24L, 24L, 24L, 24L, 24L, 24L, 24L, 24L, 24L, 24L, 24L,
25L, 25L, 25L, 25L, 25L, 25L, 25L, 25L, 25L, 25L, 25L, 25L, 25L,
26L, 26L, 26L, 26L, 26L, 26L, 26L, 26L, 26L, 26L, 26L, 26L, 26L,
27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L,
28L, 28L, 28L, 28L, 28L, 28L, 28L, 28L, 28L, 28L, 28L, 28L, 28L,
29L, 29L, 29L, 29L, 29L, 29L, 29L, 29L, 29L, 29L, 29L, 29L, 29L,
30L, 30L, 30L, 30L, 30L, 30L, 30L, 30L, 30L, 30L, 30L, 30L, 30L,
31L, 31L, 31L, 31L, 31L, 31L, 31L, 31L, 31L, 31L, 31L, 31L, 31L,
32L, 32L, 32L, 32L, 32L, 32L, 32L, 32L, 32L, 32L, 32L, 32L, 32L,
33L, 33L, 33L, 33L, 33L, 33L, 33L, 33L, 33L, 33L, 33L, 33L, 33L,
34L, 34L, 34L, 34L, 34L, 34L, 34L, 34L, 34L, 34L, 34L, 34L, 34L,
35L, 35L, 35L, 35L, 35L, 35L, 35L, 35L, 35L, 35L, 35L, 35L, 35L,
36L, 36L, 36L, 36L, 36L, 36L, 36L, 36L, 36L, 36L, 36L, 36L, 36L,
37L, 37L, 37L, 37L, 37L, 37L, 37L, 37L, 37L, 37L, 37L, 37L, 37L,
38L, 38L, 38L, 38L, 38L, 38L, 38L, 38L, 38L, 38L, 38L, 38L, 38L,
39L, 39L, 39L, 39L, 39L, 39L, 39L, 39L, 39L, 39L, 39L, 39L, 39L,
40L, 40L, 40L, 40L, 40L, 40L, 40L, 40L, 40L, 40L, 40L, 40L, 40L,
41L, 41L, 41L, 41L, 41L, 41L, 41L, 41L, 41L, 41L, 41L, 41L, 41L,
42L, 42L, 42L, 42L, 42L, 42L, 42L, 42L, 42L, 42L, 42L, 42L, 42L,
43L, 43L, 43L, 43L, 43L, 43L, 43L, 43L, 43L, 43L, 43L, 43L, 43L,
44L, 44L, 44L, 44L, 44L, 44L, 44L, 44L, 44L, 44L, 44L, 44L, 44L,
45L, 45L, 45L, 45L, 45L, 45L, 45L, 45L, 45L, 45L, 45L, 45L, 45L,
46L, 46L, 46L, 46L, 46L, 46L, 46L, 46L, 46L, 46L, 46L, 46L, 46L,
47L, 47L, 47L, 47L, 47L, 47L, 47L, 47L, 47L, 47L, 47L, 47L, 47L,
48L, 48L, 48L, 48L, 48L, 48L, 48L, 48L, 48L, 48L, 48L, 48L, 48L,
49L, 49L, 49L, 49L, 49L, 49L, 49L, 49L, 49L, 49L, 49L, 49L, 49L,
50L, 50L, 50L, 50L, 50L, 50L, 50L, 50L, 50L, 50L, 50L, 50L, 50L,
51L, 51L, 51L, 51L, 51L, 51L, 51L, 51L, 51L, 51L, 51L, 51L, 51L,
52L, 52L, 52L, 52L, 52L, 52L, 52L, 52L, 52L, 52L, 52L, 52L, 52L,
53L, 53L, 53L, 53L, 53L, 53L, 53L, 53L, 53L, 53L, 53L, 53L, 53L,
54L, 54L, 54L, 54L, 54L, 54L, 54L, 54L, 54L, 54L, 54L, 54L, 54L,
55L, 55L, 55L, 55L, 55L, 55L, 55L, 55L, 55L, 55L, 55L, 55L, 55L,
56L, 56L, 56L, 56L, 56L, 56L, 56L, 56L, 56L, 56L, 56L, 56L, 56L,
57L, 57L, 57L, 57L, 57L, 57L, 57L, 57L, 57L, 57L, 57L, 57L, 57L,
58L, 58L, 58L, 58L, 58L, 58L, 58L, 58L, 58L, 58L, 58L, 58L, 58L,
59L, 59L, 59L, 59L, 59L, 59L, 59L, 59L, 59L, 59L, 59L, 59L, 59L,
60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L,
61L, 61L, 61L, 61L, 61L, 61L, 61L, 61L, 61L, 61L, 61L, 61L, 61L,
62L, 62L, 62L, 62L, 62L, 62L, 62L, 62L, 62L, 62L, 62L, 62L, 62L,
63L, 63L, 63L, 63L, 63L, 63L, 63L, 63L, 63L, 63L, 63L, 63L, 63L,
64L, 64L, 64L, 64L, 64L, 64L, 64L, 64L, 64L, 64L, 64L, 64L, 64L,
65L, 65L, 65L, 65L, 65L, 65L, 65L, 65L, 65L, 65L, 65L, 65L, 65L,
66L, 66L, 66L, 66L, 66L, 66L, 66L, 66L, 66L, 66L, 66L, 66L, 66L,
67L, 67L, 67L, 67L, 67L, 67L, 67L, 67L, 67L, 67L, 67L, 67L, 67L,
68L, 68L, 68L, 68L, 68L, 68L, 68L, 68L, 68L, 68L, 68L, 68L, 68L,
69L, 69L, 69L, 69L, 69L, 69L, 69L, 69L, 69L, 69L, 69L, 69L, 69L,
70L, 70L, 70L, 70L, 70L, 70L, 70L, 70L, 70L, 70L, 70L, 70L, 70L,
71L, 71L, 71L, 71L, 71L, 71L, 71L, 71L, 71L, 71L, 71L, 71L, 71L,
72L, 72L, 72L, 72L, 72L, 72L, 72L, 72L, 72L, 72L, 72L, 72L, 72L,
73L, 73L, 73L, 73L, 73L, 73L, 73L, 73L, 73L, 73L, 73L, 73L, 73L,
74L, 74L, 74L, 74L, 74L, 74L, 74L, 74L, 74L, 74L, 74L, 74L, 74L,
75L, 75L, 75L, 75L, 75L, 75L, 75L, 75L, 75L, 75L, 75L, 75L, 75L,
76L, 76L, 76L, 76L, 76L, 76L, 76L, 76L, 76L, 76L, 76L, 76L, 76L,
77L, 77L, 77L, 77L, 77L, 77L, 77L, 77L, 77L, 77L, 77L, 77L, 77L,
78L, 78L, 78L, 78L, 78L, 78L, 78L, 78L, 78L, 78L, 78L, 78L, 78L,
79L, 79L, 79L, 79L, 79L, 79L, 79L, 79L, 79L, 79L, 79L, 79L, 79L,
80L, 80L, 80L, 80L, 80L, 80L, 80L, 80L, 80L, 80L, 80L, 80L, 80L,
81L, 81L, 81L, 81L, 81L, 81L, 81L, 81L, 81L, 81L, 81L, 81L, 81L
), .Label = c("50", "51", "52", "53", "54", "55", "56", "57",
"58", "59", "60", "61", "62", "63", "64", "65", "66", "67", "68",
"69", "70", "71", "72", "73", "74", "75", "76", "77", "78", "79",
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"110", "111", "112", "113", "114", "115", "116", "117", "118",
"119", "120", "121", "122", "123", "124", "125", "126", "127",
"128", "129", "130"), class = "factor"), zz = c(22, 21, 20, 20,
19, 18, 18, 17, 17, 16, 16, 15, 15, 22, 21, 21, 20, 19, 19, 18,
18, 17, 17, 16, 16, 15, 22, 22, 21, 20, 20, 19, 19, 18, 17, 17,
16, 16, 16, 23, 22, 21, 21, 20, 19, 19, 18, 18, 17, 17, 16, 16,
23, 22, 22, 21, 20, 20, 19, 19, 18, 18, 17, 17, 16, 24, 23, 22,
21, 21, 20, 20, 19, 18, 18, 17, 17, 16, 24, 23, 23, 22, 21, 21,
20, 19, 19, 18, 18, 17, 17, 25, 24, 23, 22, 22, 21, 20, 20, 19,
19, 18, 18, 17, 25, 24, 23, 23, 22, 21, 21, 20, 19, 19, 18, 18,
17, 25, 25, 24, 23, 22, 22, 21, 20, 20, 19, 19, 18, 18, 26, 25,
24, 23, 23, 22, 21, 21, 20, 20, 19, 18, 18, 26, 25, 25, 24, 23,
22, 22, 21, 20, 20, 19, 19, 18, 27, 26, 25, 24, 23, 23, 22, 21,
21, 20, 20, 19, 19, 27, 26, 25, 25, 24, 23, 22, 22, 21, 21, 20,
19, 19, 28, 27, 26, 25, 24, 23, 23, 22, 21, 21, 20, 20, 19, 28,
27, 26, 25, 25, 24, 23, 22, 22, 21, 21, 20, 19, 28, 27, 27, 26,
25, 24, 23, 23, 22, 21, 21, 20, 20, 29, 28, 27, 26, 25, 25, 24,
23, 22, 22, 21, 21, 20, 29, 28, 27, 27, 26, 25, 24, 23, 23, 22,
22, 21, 20, 30, 29, 28, 27, 26, 25, 25, 24, 23, 22, 22, 21, 21,
30, 29, 28, 27, 26, 26, 25, 24, 23, 23, 22, 22, 21, 31, 30, 29,
28, 27, 26, 25, 25, 24, 23, 22, 22, 21, 31, 30, 29, 28, 27, 26,
26, 25, 24, 23, 23, 22, 22, 31, 30, 29, 29, 28, 27, 26, 25, 24,
24, 23, 22, 22, 32, 31, 30, 29, 28, 27, 26, 26, 25, 24, 23, 23,
22, 32, 31, 30, 29, 28, 28, 27, 26, 25, 24, 24, 23, 22, 33, 32,
31, 30, 29, 28, 27, 26, 25, 25, 24, 23, 23, 33, 32, 31, 30, 29,
28, 27, 27, 26, 25, 24, 24, 23, 34, 32, 31, 30, 30, 29, 28, 27,
26, 25, 25, 24, 23, 34, 33, 32, 31, 30, 29, 28, 27, 26, 26, 25,
24, 24, 34, 33, 32, 31, 30, 29, 28, 28, 27, 26, 25, 25, 24, 35,
34, 33, 32, 31, 30, 29, 28, 27, 26, 26, 25, 24, 35, 34, 33, 32,
31, 30, 29, 28, 27, 27, 26, 25, 25, 36, 35, 33, 32, 31, 30, 30,
29, 28, 27, 26, 26, 25, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27,
27, 26, 25, 37, 35, 34, 33, 32, 31, 30, 29, 28, 28, 27, 26, 25,
37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 26, 26, 37, 36, 35,
34, 33, 32, 31, 30, 29, 28, 28, 27, 26, 38, 37, 35, 34, 33, 32,
31, 30, 29, 29, 28, 27, 26, 38, 37, 36, 35, 34, 33, 32, 31, 30,
29, 28, 27, 27, 39, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 28,
27, 39, 38, 37, 36, 34, 33, 32, 31, 31, 30, 29, 28, 27, 40, 38,
37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 28, 40, 39, 38, 36, 35,
34, 33, 32, 31, 30, 29, 29, 28, 40, 39, 38, 37, 36, 34, 33, 32,
32, 31, 30, 29, 28, 41, 40, 38, 37, 36, 35, 34, 33, 32, 31, 30,
29, 28, 41, 40, 39, 37, 36, 35, 34, 33, 32, 31, 30, 30, 29, 42,
40, 39, 38, 37, 36, 35, 33, 33, 32, 31, 30, 29, 42, 41, 40, 38,
37, 36, 35, 34, 33, 32, 31, 30, 29, 43, 41, 40, 39, 37, 36, 35,
34, 33, 32, 31, 30, 30, 43, 42, 40, 39, 38, 37, 36, 35, 34, 33,
32, 31, 30, 43, 42, 41, 39, 38, 37, 36, 35, 34, 33, 32, 31, 30,
44, 42, 41, 40, 39, 37, 36, 35, 34, 33, 32, 31, 30, 44, 43, 42,
40, 39, 38, 37, 36, 35, 34, 33, 32, 31, 45, 43, 42, 41, 39, 38,
37, 36, 35, 34, 33, 32, 31, 45, 44, 42, 41, 40, 39, 37, 36, 35,
34, 33, 32, 31, 46, 44, 43, 41, 40, 39, 38, 37, 36, 35, 34, 33,
32, 46, 45, 43, 42, 40, 39, 38, 37, 36, 35, 34, 33, 32, 47, 45,
44, 42, 41, 40, 38, 37, 36, 35, 34, 33, 32, 47, 45, 44, 43, 41,
40, 39, 38, 37, 35, 34, 34, 33, 47, 46, 44, 43, 42, 40, 39, 38,
37, 36, 35, 34, 33, 48, 46, 45, 43, 42, 41, 39, 38, 37, 36, 35,
34, 33, 48, 47, 45, 44, 42, 41, 40, 39, 38, 36, 35, 34, 33, 49,
47, 46, 44, 43, 41, 40, 39, 38, 37, 36, 35, 34, 49, 47, 46, 45,
43, 42, 41, 39, 38, 37, 36, 35, 34, 50, 48, 46, 45, 44, 42, 41,
40, 39, 37, 36, 35, 34, 50, 48, 47, 45, 44, 43, 41, 40, 39, 38,
37, 36, 35, 50, 49, 47, 46, 44, 43, 42, 40, 39, 38, 37, 36, 35,
51, 49, 48, 46, 45, 43, 42, 41, 40, 38, 37, 36, 35, 51, 50, 48,
46, 45, 44, 42, 41, 40, 39, 38, 37, 36, 52, 50, 48, 47, 45, 44,
43, 41, 40, 39, 38, 37, 36, 52, 50, 49, 47, 46, 44, 43, 42, 41,
39, 38, 37, 36, 53, 51, 49, 48, 46, 45, 43, 42, 41, 40, 39, 38,
36, 53, 51, 50, 48, 47, 45, 44, 42, 41, 40, 39, 38, 37, 53, 52,
50, 48, 47, 45, 44, 43, 42, 40, 39, 38, 37, 54, 52, 50, 49, 47,
46, 44, 43, 42, 41, 40, 38, 37, 54, 52, 51, 49, 48, 46, 45, 44,
42, 41, 40, 39, 38, 55, 53, 51, 50, 48, 47, 45, 44, 43, 41, 40,
39, 38, 55, 53, 52, 50, 48, 47, 46, 44, 43, 42, 40, 39, 38, 56,
54, 52, 50, 49, 47, 46, 45, 43, 42, 41, 40, 39, 56, 54, 52, 51,
49, 48, 46, 45, 44, 42, 41, 40, 39)), row.names = c(NA, -1053L
), .Names = c("yy", "xx", "zz"), class = "data.frame")
library(ggplot2)
ggplot(ddf) + geom_tile(aes(x=xx, y=yy, fill=zz))
它使用默认蓝色阴影绘制绘图。但是如何为这个geom_tile图使用以下调色板：
colorRampPalette(c("blue", "green", "yellow", "red"))
感谢您的帮助。
1 个答案:
答案 0 :(得分：5)
ggplot2中有一个很好的指南：http://www.cookbook-r.com/Graphs/Colors_(ggplot2)/
在您的情况下，由于ddf$zz只有42个唯一级别，您可以尝试这样做：
> length(unique(ddf$zz))
[1] 42
> colors <- colorRampPalette(c("blue", "green", "yellow", "red"))(42)
> ggplot(ddf) + geom_tile(aes(x=xx, y=yy, fill=factor(zz))) +
scale_fill_manual(values=colors)
rnso指出，上面的代码会生成一个很长的图例，不能适应画布。解决这个问题：
> ddf$zz <- factor(ddf$zz)
> N <- nlevels(ddf$zz)
> ggplot(ddf) + geom_tile(aes(x=xx, y=yy, fill=zz)) +
scale_fill_manual(values=colors, breaks=levels(ddf$zz)[seq(1, N, by=5)])
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