# Math¶

Math task is used to perform arithmetic operations on the data. This task supports standard BODMAS expression with support for some inbuilt functions.

## Quick Start¶

Let us start with the following data which is a score card of a group of students for three subjects:

Student Science French English
Alice 78 65 81
Bob 45 80 68
Jerry 91 80 90
Rachel 35 32 85

Complete the following steps to calculate the total number of Marks that the the students have received:

1. Open Data Preparation menu and click on Numeric Functions
2. Select Perform Math Function
3. In the expression box, build the expression: Science + French + English
4. Enter “Total” into the new column box
5. Click APPLY

The result will appear as shown below:

Student Science French English Total
Alice 78 65 81 224
Bob 45 80 68 193
Jerry 91 80 90 261
Rachel 35 32 85 152

## Supported Options¶

Math task takes the following inputs:

## Arithmetic Expression¶

Arithmetic expression accepted by the math tasks supports the following arithmetic operators. +, -, *, /. These operands work on the following types of operands.

1. Numbers
2. Columns
3. Functions such as count, sum, avg. See Functions
4. Nested expression

Examples:

Let us assume that your original data is as shown below:

Student Science French English
Alice 78 65 81
Bob 45 80 68
Jerry 91 80 90
Rachel 35 32 85

The valid expressions are:

• 2
• 3+4
• “Science” + “French”
• (“Science” + “French” + ”English”)/300
• AVG(“Science”) - “Science”
• INT((“Science” + “French” + ”English”)/3)

Note that the column names are put within a quoted string. The application shows hints to guide you to the right expression. If the expression is invalid, a warning is displayed at the bottom right of the expression box.

The expressions can be copied and pasted. You can paste an expression into a normal text editor like notepad, edit it and paste if back. The expression will work if it is valid.

The criterion for valid expression are:

1. Referring to the correct column names.
2. The braces are correctly opened, and
3. The functions used (such as SUM, COUNT) and so on, should have the correct parameters. See documentation for the functions and their parameters.

Expressions can be nested inside one another using parentheses. The following expressions are valid.

• (10 + 20)/(20 + 40)
• (10 - (20 + 40 * (100 -55)) + 20)
• (10 * (20 + 40) + 20)/(“Science” + 10)

You can nest to as many levels. However, it is simpler to add more than one math rule at time to keep it simple and readable.

The results of the arithmetic expression is saved into a new column.

### Handling empty values¶

When performing + - * / operations empty values are treated as if they are zeroes.

### Division by zero¶

Division by zero leads to empty values.

Number Formatting

The numeric formatter documentation

Numeric functions

Description of the functions

Result Column

The result column documentation