[RS-ecology] problem with RStoolbox

[Dragan Kaludjerovic]

Hi,
I have just discover RStoolbox and try simple simple script

install.packages("RStoolbox")
install.packages(raster)

library(ggplot2)
library(raster)
library(rgdal)

data(img)

## Calculate NDVI
ndvi <- spectralIndices(img, red = "C:/R_examples/VI/B3.tif", nir =
"C:/R_examples/VI/B4.tif", indices = "NDVI")
ndvi


when I run it I got error message

Error in match(xi, names(img)) : object 'img' not found

Any suggestion is welcomed!

Best Regards,

Dragan
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