Data Forms

DolphinDB has the following data forms:


Data Form Name	Example
scalar	5, 1.3, 2012.11.15, `hello
vector	5 4 8 or [5, 4, 8], array, BigArray, arrayVector
pair	3:5; 'a':'c'; "Tom":"John", pair
matrix	1..6$2:3 or reshape(1..6, 2:3). matrix: matrix; indexed matrix: setIndexedMatrix!; indexed series: indexedSeries / setIndexedSeries!
set	set
dictionary	dict
table	in-memory table: table; DFS table: createPartitionedTable; indexed table: indexedTable; keyed table: keyedTable; stream table: streamTable; high-availability stream table: haStreamTable; mvcc table: mvccTable
tensor	Use tensor to create tensors with up to 10 dimensions. Note: Only the following data types are currently supported: BOOL, CHAR, SHORT, INT, LONG, FLOAT, DOUBLE.

Use function form to get the data form ID of a variable or constant.

form false;
// output
0
form `TEST;
// output
0

form `t1`t2`t3;
// output
1
form 1 2 3;
// output
1

x= 1 2 3
if(form(x) == VECTOR){y=1};
y;
// output
1

form 1..6$2:3;
// output
3

form(tensor(1..10$5:2))
// output: 10