S3 Ops Group Generic Functions for stars objects

Source: R/ops.R

Ops functions for stars objects, including comparison, product and divide, add, subtract

# S3 method for stars
Ops(e1, e2)

# S3 method for stars
Math(x, ...)

# S3 method for stars_proxy
Ops(e1, e2)

# S3 method for stars_proxy
Math(x, ...)

Arguments

e1

object of class stars
e2

object of class stars
x

object of class stars
...

parameters passed on to the Math functions

Value

object of class stars

Examples

tif = system.file("tif/L7_ETMs.tif", package = "stars")
x = read_stars(tif)
x * x
#> stars object with 3 dimensions and 1 attribute
#> attribute(s):
#>   L7_ETMs.tif   
#>  Min.   :    1  
#>  1st Qu.: 2916  
#>  Median : 4761  
#>  Mean   : 5512  
#>  3rd Qu.: 7396  
#>  Max.   :65025  
#> dimension(s):
#>      from  to  offset delta                       refsys point values    
#> x       1 349  288776  28.5 PROJCS["UTM Zone 25, Sout... FALSE   NULL [x]
#> y       1 352 9120761 -28.5 PROJCS["UTM Zone 25, Sout... FALSE   NULL [y]
#> band    1   6      NA    NA                           NA    NA   NULL    
x / x
#> stars object with 3 dimensions and 1 attribute
#> attribute(s):
#>   L7_ETMs.tif 
#>  Min.   :1    
#>  1st Qu.:1    
#>  Median :1    
#>  Mean   :1    
#>  3rd Qu.:1    
#>  Max.   :1    
#> dimension(s):
#>      from  to  offset delta                       refsys point values    
#> x       1 349  288776  28.5 PROJCS["UTM Zone 25, Sout... FALSE   NULL [x]
#> y       1 352 9120761 -28.5 PROJCS["UTM Zone 25, Sout... FALSE   NULL [y]
#> band    1   6      NA    NA                           NA    NA   NULL    
x + x
#> stars object with 3 dimensions and 1 attribute
#> attribute(s):
#>   L7_ETMs.tif   
#>  Min.   :  2.0  
#>  1st Qu.:108.0  
#>  Median :138.0  
#>  Mean   :137.8  
#>  3rd Qu.:172.0  
#>  Max.   :510.0  
#> dimension(s):
#>      from  to  offset delta                       refsys point values    
#> x       1 349  288776  28.5 PROJCS["UTM Zone 25, Sout... FALSE   NULL [x]
#> y       1 352 9120761 -28.5 PROJCS["UTM Zone 25, Sout... FALSE   NULL [y]
#> band    1   6      NA    NA                           NA    NA   NULL    
x + 10
#> stars object with 3 dimensions and 1 attribute
#> attribute(s):
#>   L7_ETMs.tif    
#>  Min.   : 11.00  
#>  1st Qu.: 64.00  
#>  Median : 79.00  
#>  Mean   : 78.91  
#>  3rd Qu.: 96.00  
#>  Max.   :265.00  
#> dimension(s):
#>      from  to  offset delta                       refsys point values    
#> x       1 349  288776  28.5 PROJCS["UTM Zone 25, Sout... FALSE   NULL [x]
#> y       1 352 9120761 -28.5 PROJCS["UTM Zone 25, Sout... FALSE   NULL [y]
#> band    1   6      NA    NA                           NA    NA   NULL    
all.equal(x * 10, 10 * x)
#> [1] TRUE
tif = system.file("tif/L7_ETMs.tif", package = "stars")
x = read_stars(tif)
a = sqrt(x)
b = log(x, base = 10)