4.76 product - Product

Format: product( $num_1,num_2,\cdots$ )

Calculate the product of the array of values in $num_ i$ . NULL values are ignored, if NULL values exist in all items, the result will return a NULL value.

Examples

Example 1: Basic Example

$ more dat1.csv
id,v1,v2,v3
1,1,2,3
2,-5,2,1
3,1,,3
4,,,
$ mcal c='product(${v1},${v2},${v3})' a=rsl i=dat1.csv o=rsl1.csv
#END# kgcal a=rsl c=product(${v1},${v2},${v3}) i=dat1.csv o=rsl1.csv
$ more rsl1.csv
id,v1,v2,v3,rsl
1,1,2,3,6
2,-5,2,1,-10
3,1,,3,3
4,,,,

Example 2: Example using wildcard

Use the wildcard character “v*” to specify columns starting from v (v1,v2,v3).

$ mcal c='product(${v*})' a=rsl i=dat1.csv o=rsl2.csv
#END# kgcal a=rsl c=product(${v*}) i=dat1.csv o=rsl2.csv
$ more rsl2.csv
id,v1,v2,v3,rsl
1,1,2,3,6
2,-5,2,1,-10
3,1,,3,3
4,,,,