我正在尝试在R上创建一个简单的热图。我的dataframe看起来像这样：

% changes@site_1   % changes@site_2
observation_1     0.358249346         2.799098208  
observation_2     0.364915472         2.708782649
observation_3     0.278763325         3.346167761
observation_4     0.16328117          6.540884852
observation_5     0.81721982          1.18541967
observation_6     0.882339386         1.164870413
observation_7     0.70736946          1.359606195
observation_8     0.963131146         1.035026205
observation_9     0.015797898         9.86748686
observation_10    0.215082099         3.458365581
observation_11    0.903703133         1.080001078
observation_12    0.870374479         1.11292402
observation_13    1.163808464         0.912561512
observation_14    1.033157819         0.962176714

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我确保将加载的df转换为矩阵：

df <- as.matrix(df)

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然后，键入热图语法：

heatmap(df)

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但是，我得到了一个错误，如下所示：

Error in heatmap(df) : 'x' must be a numeric matrix

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我对错误的最佳猜测是第一列包含字符串和数字。解决此错误的最佳方法是什么？- 谢谢-谢谢

• tl;dr* 我尝试创建一个热图并转换为矩阵，然后期望R创建一个热图，但导致错误（如上所述）。在本论坛上搜索以前的问题时，无法找到明确的答案。

编辑1：
'dput'的输出：

dput(df):

structure(c("observation_1", "observation_2", "observation_3", 
"observation_4", "observation_5", "observation_6", "observation_7", 
"observation_8", "observation_9", "observation_10", "observation_11", 
"observation_12", "observation_13", "observation_14", "0.3582493", 
"0.3649155", "0.2787633", "0.1632812", "0.8172198", "0.8823394", 
"0.7073695", "0.9631311", "0.0157979", "0.2150821", "0.9037031", 
"0.8703745", "1.1638085", "1.0331578", "2.7990972", "2.7087826", 
"3.3461678", "6.5408849", "1.1854820", "1.1648704", "1.3596062", 
"1.0350262", "9.8674869", "3.4583656", "1.0800011", "1.1129240", 
"0.9125615", "0.9621767"), dim = c(14L, 3L), dimnames = list(
    NULL, c("X", "X..changes.site_1", "X..changes.site_2")))

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“is.numeric（df[，1]）”的输出：

is.numeric(df[,1]):

Error in df[,1]: object of type 'closure' is not subsettable

编辑2：删除不必要的标签