Error: In Ops.factor

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I’m working with a weather data.frame and I want to know if the data is within the reading limits of the equipment. For this purpose the tolerance limits adopted for temperature (temp_med, temp_max and temp_min) are -40° C a + 60 ° C. In a new column notes are assigned: 1 when the data are within that limit, 3 for when you’re away and 7 when the line has no data.

Script used: 

lim_temp<- (-40)<= dados_horas$temp_med & dados_horas$temp_med <= 60
dados_horas$nota1_temp_med [lim_temp] <- 5L
dados_horas$nota1_temp_med [!lim_temp] <- 6L
dados_horas$nota1_temp_med <- 7L

Obs: dados_horas - Name of my database; temp_med - column I want to work; nota1_temp_med - new column with the notes.

But is appearing the following error:

Warning messages: 1: In Ops.factor(dates_hours$temp_med, (-40)) : huh<' not Meaningful for factors 2: In Ops.factor(time_hours$temp_med, 60) : pra<=' not Meaningful for factors

What must I do to correct this mistake?

Part of the database:

dia data    hora    temp_med    temp_max    temp_min
1   01/01/2012  12:00:20 AM 20.345  20.517  20.145
1   01/01/2012  1:00:07 AM  20.242  20.523  20.021
1   01/01/2012  2:00:08 AM  19.916  20.071  19.462
1   01/01/2012  3:00:08 AM  19.332  19.452  19.26
1   01/01/2012  4:00:08 AM  19.1    19.449  18.528
1   01/01/2012  5:00:08 AM  18.434  18.526  18.398
1   01/01/2012  6:00:08 AM  18.411  18.443  18.379
1   01/01/2012  7:00:08 AM  18.663  19.087  18.396
1   01/01/2012  8:00:07 AM  19.576  20.089  19.097
1   01/01/2012  9:00:07 AM  20.613  21.393  20.06
1   01/01/2012  10:00:07 AM 22.22   23.83   21.4
1   01/01/2012  11:00:07 AM 23.412  23.875  22.842
1   01/01/2012  12:00:08 PM 23.87   24.774  23.222
1   01/01/2012  1:00:08 PM  22.195  24.474  20.645
1   01/01/2012  2:00:08 PM  23.03   23.579  22.674
1   01/01/2012  3:00:08 PM  24.016  24.845  22.82
1   01/01/2012  4:00:08 PM  24.095  25.074  23.343
1   01/01/2012  5:00:08 PM  23.831  25.064  23.193
1   01/01/2012  6:00:08 PM  22.71   23.203  21.944
1   01/01/2012  7:00:07 PM  22.036  22.629  21.277
1   01/01/2012  8:00:07 PM  20.959  21.32   20.503
1   01/01/2012  9:00:07 PM  20.208  20.659  19.583
1   01/01/2012  10:00:07 PM 19.743  20.029  19.381
1   01/01/2012  11:00:07 PM 19.98   20.224  19.709
2   02/01/2012  12:00:20 AM 20.032  20.149  19.872
r
  • 1

    That mistake means that temp_med is being read as factor Do dados_horas$temp_med <- as.numeric(as.character(dados_horas$temp_med)).

1 answer

1

As pointed out in comments by @Ruibarradas, the error message is stating that this operation is not significant for factors.

In the , factors are categorical variables. And indeed there is no reason to believe that there can be comparisons of the major or minor type between variables such as "Man"/"Woman" or "Asia"/"America"/"Africa".

This problem occurred because numerical data were read as factor. To solve it, just turn the data to numerical.

In the solution proposed by @Ruibarradas in the comments,

dados_horas$temp_med <- as.numeric(as.character(dados_horas$temp_med))

It is worth remembering that to transform factor data to numerical it is necessary, before transforming it into text.

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