R 基于15分钟数据的土壤水势日平均值计算

我是R的新手。我有一个土壤水势值的数据框架，记录在两个区域和5个深度，间隔15分钟。我想计算每个区域和深度的土壤水势在两年内的日平均值。你能帮帮我吗

以下是数据框的一部分：

TimeStamp_Field       Area     Parameter           Value     Sensor_UID    Depth Unit
07/01/2017  00:00:00    S   soil_water_potential    1.2     N_B3_TM_10/1_WP 10  pF
07/01/2017  00:15:00    S   soil_water_potential    1.193   N_B3_TM_10/1_WP 10  pF
07/01/2017  00:29:52    S   soil_water_potential    1.204   N_B3_TM_10/1_WP 10  pF
07/01/2017  00:45:00    S   soil_water_potential    1.203   N_B3_TM_10/1_WP 10  pF
07/01/2017  01:00:00    S   soil_water_potential    1.205   N_B3_TM_10/1_WP 10  pF
07/01/2017  01:15:00    S   soil_water_potential    1.214   N_B3_TM_10/1_WP 10  pF
07/01/2017  01:30:00    S   soil_water_potential    1.22    N_B3_TM_10/1_WP 10  pF
07/01/2017  01:45:00    S   soil_water_potential    1.219   N_B3_TM_10/1_WP 10  pF
07/01/2017  02:00:00    S   soil_water_potential    1.222   N_B3_TM_10/1_WP 10  pF
07/01/2017  02:15:00    S   soil_water_potential    1.229   N_B3_TM_10/1_WP 10  pF
07/01/2017  02:30:00    S   soil_water_potential    1.233   N_B3_TM_10/1_WP 10  pF
07/01/2017  02:45:00    S   soil_water_potential    1.231   N_B3_TM_10/1_WP 10  pF
07/01/2017  03:00:00    S   soil_water_potential    1.23    N_B3_TM_10/1_WP 10  pF
07/01/2017  03:15:00    S   soil_water_potential    1.239   N_B3_TM_10/1_WP 10  pF
07/01/2017  03:30:00    S   soil_water_potential    1.238   N_B3_TM_10/1_WP 10  pF
07/01/2017  03:45:00    S   soil_water_potential    1.236   N_B3_TM_10/1_WP 10  pF
07/01/2017  04:00:00    S   soil_water_potential    1.24    N_B3_TM_10/1_WP 10  pF

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您可以根据时间戳为日/月/年创建新字段，然后在这些列上加上参数/传感器UID（如果需要）创建

groupby

和

summary

，以计算平均值。

到目前为止您尝试了什么，能否列出您尝试过的代码并解释您的编码问题在哪里？