# smalianwob: Calculate the volume without bark of trees using the Smalian... In forestmangr: Forest Mensuration and Management

## Description

Function used to calculate the volume without bark of trees using the Smalian method. This function has integration with dplyr, so it can be used inside a pipe, along with the `group_by` function.

## Usage

 ``` 1 2 3 4 5 6 7 8 9 10 11``` ```smalianwob( df, di, hi, bt, tree, .groups = NA, di_mm_to_cm = FALSE, hi_cm_to_m = FALSE, bt_mm_to_cm = FALSE ) ```

## Arguments

 `df` A data frame. `di` Quoted name of the section diameter variable, in centimeters. `hi` Quoted name of the section height variable, in meters `bt` Quoted name of the bark thickness variable, in centimeters. `tree` Quoted name of the tree variable. used to differentiate the trees' sections. If this argument is `NA`, the defined groups in the data frame will be used. Default: `NA`. `.groups` Optional argument. Quoted name(s) of additional grouping variables that can be added to differentiate subdivisions of the data. If this argument is `NA`, the defined groups in the data frame will be used. Default: `NA`. `di_mm_to_cm` Boolean argument that, if `TRUE`, converts the di argument from milliliters to centimeters. Default: `FALSE`. `hi_cm_to_m` Boolean argument that, if `TRUE`, converts the hi argument from centimeters to meters. Default: `FALSE`. `bt_mm_to_cm` Boolean argument that, if `TRUE`, converts the bt argument from milliliters to centimeters. Default: `FALSE`.

## Value

Data frame with volume values by section.

## Author(s)

Sollano Rabelo Braga sollanorb@gmail.com

## References

Campos, J. C. C. and Leite, H. G. (2017) Mensuracao Florestal: Perguntas e Respostas. 5a. Vicosa: UFV.

Complementary functions: `smalianwb`, For calculation of volume with bark using the Smalian method, `huberwb`, for calculation of volume with bark using the Huber method, `huberwob`, for calculation of volume without bark the Huber method.
 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13``` ```library(forestmangr) data("exfm7") head(exfm7) # Calculate the volume without bark using Smalian's method: smalianwob(exfm7,"di_wb", "hi", "bark_t", "TREE") # Using pipes: library(dplyr) exfm7 %>% group_by(TREE) %>% smalianwob("di_wb", "hi", "bark_t") ```