Problems with filter()

[EconomiCurtis]

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filter() does not recognize the name of a column

I have this tibble > DS90_2 # A tibble: 50 x 3 Parametro Tabla Valor <chr> <chr> <dbl> 1 Aluminio total (Al) Tabla 1 5 2 Aluminio total (Al) Tabla 2 10 3 Aluminio total (Al) Tabla 3 1 4 Aluminio total (Al) Tabla 4 1 5 Aluminio total (Al) Tabla 5 10 6 Arsénico total (As) Tabla 1 0.5 7 Arsénico total (As) Tabla 2 1 8 Arsénico total (As) Tabla 3 0.1 9 Arsénico total (As) Tabla 4 0.2 10 Arsénico total (As) Tabla 5 0.5 # ... with 40 more rows When I use filter() to column "Parametro", does not work: > filter(DS90_2,Parametro== "Aluminio total (Al)") # A tibble: 0 x 3 # ... with 3 variables: Parametro <chr>, Tabla <chr>, V…