size

size(X)

X is a scalar/vector/matrix/table.

For a vector/matrix, size returns the number of elements. In comparison, count returns the number of non-null elements.

For an in-memory table, size returns the number of rows.

size(3 NULL 5 6);
// output
4
count(3 NULL 5 6);
// output
3

m=1 2 3 NULL 4 5$2:3;
m;

size(m);
// output
6

count(m);
// output
5

t = table(1 NULL 3 as id, 3 NULL 9 as qty);
t;

size(t);
// output
3

count(t);
// output
3