Example with table output

This script takes input vector data and one of its fields. The result is a table with summary statistics for a given field of the layer.

Script

##Basic statistics=group
##Statistic table=name
##Layer=vector
##Field=Field Layer
##Stat_file=Output file csv
##Stat=Output table noprompt
Summary_statistics <- data.frame(rbind(
        sum(Layer[[Field]]),
        length(Layer[[Field]]),
        length(unique(Layer[[Field]])),
        min(Layer[[Field]]),
        max(Layer[[Field]]),
        max(Layer[[Field]])-min(Layer[[Field]]),
        mean(Layer[[Field]]),
        median(Layer[[Field]]),
        sd(Layer[[Field]])),
        row.names=c("Sum:","Count:","Unique values:","Minimum value:","Maximum value:","Range:","Mean value:","Median value:","Standard deviation:"))
colnames(Summary_statistics) <- c(Field)
write.csv2(Summary_statistics, Stat_file, row.names = FALSE, na ="")
Stat <- Stat_file

Script lines description

1. Basic statistics is the group of the algorithm.
2. Statistic table is the name of the algorithm.
3. Layer is the input vector layer.
4. Field is the name of a field from Layer.
5. Stat_file is the name of output that will be selected by user to store result.
6. Stat is the name of output that will be created and returned to QGIS.
7. Create data.frame with calculated statistics and assign correct row names.
8. Give the data.frame correct colname, the name of the field.
9. Write the created data.frame to output file (Stat_file) with a controlled formatting.
10. Assign the output file path to table output (Stat) to be presented in QGIS

The output will be presented in QGIS as a table with a controlled formatting.