Select parameters (param) or derived quantities by index from a plan position indicator (ppi).

# S3 method for ppi
[(x, i)

Arguments

x

A ppi object.

i

Integer. Index/indices specifying which parameters (param) or derived quantities to extract.

Value

A ppi object containing a subset of parameters (param).

Examples

# Project the example scan as a ppi ppi <- project_as_ppi(example_scan) # This ppi contains 5 parameters (VRADH DBZH ZDR RHOHV PHIDP) ppi
#> Plan position indicator (class ppi) #> #> parameters: VRADH DBZH ZDR RHOHV PHIDP #> dims: 200 x 200 pixels #>
# Subset ppi to one containing only the first parameter (VRADH) ppi[1]
#> Plan position indicator (class ppi) #> #> parameters: VRADH #> dims: 200 x 200 pixels #>
# Subset ppi to one containing the first three parameters (VRADH, DBZH, ZDR) ppi[1:3]
#> Plan position indicator (class ppi) #> #> parameters: VRADH DBZH ZDR #> dims: 200 x 200 pixels #>
# Subset ppi to one without the first 2 parameters (ZDR RHOHV PHIDP) ppi[-1:-2]
#> Plan position indicator (class ppi) #> #> parameters: ZDR RHOHV PHIDP #> dims: 200 x 200 pixels #>