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MaxCompute:EXP

Last Updated:Jul 24, 2023

Calculates the exponential value of number.

Syntax

double|decimal exp(<number>)

Parameters

number: required. A value of the DOUBLE or DECIMAL type. If the input value is of the STRING or BIGINT type, the value is implicitly converted into a value of the DOUBLE type before calculation.

Return value

A value of the DOUBLE or DECIMAL type is returned. The return value varies based on the following rules:

  • If number is of the DOUBLE or DECIMAL type, a value of the same type is returned.

  • If number is of the STRING or BIGINT type, a value of the DOUBLE type is returned.

  • If the value of number is null, null is returned.

Sample data

This section provides sample source data and examples for you to understand how to use the functions. In this topic, a table named mf_math_fun_t is created and data is inserted into the table. Sample statements:

create table if not exists mf_math_fun_t(
     int_data     int,
     bigint_data  bigint,
     double_data  double,
     decimal_data decimal,
     float_data   float,
     string_data  string
    );
insert into mf_math_fun_t values
(null, -10, 0.525, 0.525BD, cast(0.525 as float), '10'),
(-20, null, -0.1, -0.1BD, cast(-0.1 as float), '-10'),
(0, -1, null, 20.45BD, cast(-1 as float), '30'),
(-40, 4, 0.89, null, cast(0.89 as float), '-30'),
(5, -50, -1, -1BD, null, '50'),
(-60, 6, 1.5, 1.5BD, cast(1.5 as float), '-50'),
(-1, -70, -7.5, -7.5BD, cast(-7.5 as float),null ),
(-80, 1, -10.2, -10.2BD, cast(-10.2 as float), '-1' ),
(9, -90, 2.58, 2.58BD, cast(2.58 as float), '0'),
(-100, 10, -5.8, -5.8BD, cast(-5.8 as float), '-90');

Query data from the mf_math_fun_t table. Sample statement:

select * from mf_math_fun_t;
-- The following result is returned: 
+------------+-------------+-------------+--------------+------------+-------------+
| int_data   | bigint_data | double_data | decimal_data | float_data | string_data |
+------------+-------------+-------------+--------------+------------+-------------+
| NULL       | -10         | 0.525       | 0.525        | 0.525      | 10          |
| -20        | NULL        | -0.1        | -0.1         | -0.1       | -10         |
| 0          | -1          | NULL        | 20.45        | -1.0       | 30          |
| -40        | 4           | 0.89        | NULL         | 0.89       | -30         |
| 5          | -50         | -1.0        | -1           | NULL       | 50          |
| -60        | 6           | 1.5         | 1.5          | 1.5        | -50         |
| -1         | -70         | -7.5        | -7.5         | -7.5       | NULL        |
| -80        | 1           | -10.2       | -10.2        | -10.2      | -1          |
| 9          | -90         | 2.58        | 2.58         | 2.58       | 0           |
| -100       | 10          | -5.8        | -5.8         | -5.8       | -90         |
+------------+-------------+-------------+--------------+------------+-------------+

Example: static data

-- The return value is 4.810477252069109. 
select exp(3.1415926/2);
-- The return value is null. 
select exp(null);

Example: table data

Calculate the exponential value based on the Sample data. Sample statement:

select exp(bigint_data) as bigint_new, exp(double_data) as double_new, exp(decimal_data) as decimal_new, exp(string_data) as string_new from mf_math_fun_t;

The following result is returned:

+-------------------------+-------------------------+-------------------------+-------------------------+
| bigint_new              | double_new              | decimal_new             | string_new              |
+-------------------------+-------------------------+-------------------------+-------------------------+
| 0.000045399929762484854 | 1.6904588483790914      | 1.6904588483790914      | 22026.465794806718      |
| NULL                    | 0.9048374180359595      | 0.9048374180359595      | 0.000045399929762484854 |
| 0.36787944117144233     | NULL                    | 760890487.9368925       | 10686474581524.463      |
| 54.598150033144236      | 2.4351296512898744      | NULL                    | 9.357622968840175e-14   |
| 1.9287498479639178e-22  | 0.36787944117144233     | 0.36787944117144233     | 5.184705528587072e21    |
| 403.4287934927351       | 4.4816890703380645      | 4.4816890703380645      | 1.9287498479639178e-22  |
| 3.975449735908647e-31   | 0.0005530843701478336   | 0.0005530843701478336   | NULL                    |
| 2.718281828459045       | 0.000037170318684126734 | 0.000037170318684126734 | 0.36787944117144233     |
| 8.194012623990515e-40   | 13.197138159658358      | 13.197138159658358      | 1.0                     |
| 22026.465794806718      | 0.0030275547453758153   | 0.0030275547453758153   | 8.194012623990515e-40   |
+-------------------------+-------------------------+-------------------------+-------------------------+

Related functions

EXP is a mathematical function. For more information about functions related to data computing and conversion, see Mathematical functions.