ceil

Syntax

ceil(X)

Details

Functions floor and ceil map a real number to the largest previous and the smallest following integer, respectively. Function round maps a real number to the largest previous or the smallest following integer with the round half up rule.

Note:
  • Difference from numpy.ceil: DolphinDB ceil function only accepts one parameter, X, and does not support parameters such as out, where, dtype, casting, and order found in numpy.ceil.
  • Difference from Python TA-Lib’s CEIL: Both functions round values upward. TA-Lib’s CEIL(close) is a Math Transform function for vector input and returns a floating-point array. DolphinDB’s ceil(X) accepts a scalar, vector, or matrix and returns an integer scalar, vector, or matrix.

Parameters

X is a scalar/vector/matrix.

Returns

An integer scalar/vector/matrix.

Examples

ceil(2.1);
// output: 3
ceil(2.9);
// output: 3
ceil(-2.1);
// output: -2

floor(2.1);
// output: 2
floor(2.9);
// output: 2
floor(-2.1);
// output: -3

round(2.1);
// output: 2
round(2.9);
// output: 3
round(-2.1);
// output: -2

m = 1.1 2.2 3.3 4.4 5.5 6.6 7.7 8.8 9.9 10$2:5;
m;
0 1 2 3 4
1.1 3.3 5.5 7.7 9.9
2.2 4.4 6.6 8.8 10 
ceil(m);
0 1 2 3 4
2 4 6 8 10
3 5 7 9 10