Rounding and Truncating Numbers
Problem
Your calculations call for you to either round or truncate values in your spreadsheet.
Solution
Use one or more of the built-in functions shown in Table 7-6.
|
Function |
Syntax |
Description |
|---|---|---|
|
ROUND |
=ROUND(n, digits) |
Rounds the number n to the specified number of digits |
|
ROUNDUP |
=ROUNDUP(n, digits) |
Rounds the number n up to the specified number of digits |
|
ROUNDDOWN |
=ROUNDDOWN(n, digits) |
Rounds the number n down to the specified number of digits |
|
MROUND |
=MROUND(n, multiple) |
Rounds the number n to the nearest multiple |
|
CEILING |
=CEILING(n, multiple) |
Rounds the number n up to the nearest multiple |
|
EVEN |
=EVEN(n) |
Rounds the number n to the nearest even integer |
|
ODD |
=ODD(n) |
Rounds the number n to the nearest odd integer |
|
INT |
=INT(n) |
Rounds the number n to the nearest integer |
|
trUNC |
=trUNC(n, digits) |
Truncates the number n at the specified number of digits |
Discussion
In Excel you can format any cell displaying a value to display that value to a specified number of decimal places. For example, you can format a cell containing the value 4.5837450 to display the number to only two decimal places (that is, 4.58). Formatting a cell to display only a certain number of decimal places does not change the underlying value; it only changes what's shown in the cell. To actually change the value, you need to use the rounding or truncating functions shown in Table 7-6.
I pretty much use the ROUND function as my workhorse for rounding numbers. For example, to round the value 3.213 to one decimal place use =ROUND(3.213, 1); this returns 3.2. To round a value to the nearest integer, specify 0 for the number of digits. For example, to round 3.213 to the nearest integer use =ROUND(3.213, 0) this returns 3.
You can also use ROUND to round a value to the nearest significant digit to the left of the decimal place. To do so, specify a negative number of digits. For example, =ROUND(121.986,-1) returns a value of 120. The formula =ROUND(12839.31,-3) returns a value of 13,000.
Using Excel
- Introduction
- Navigating the Interface
- Entering Data
- Setting Cell Data Types
- Selecting More Than a Single Cell
- Entering Formulas
- Exploring the R1C1 Cell Reference Style
- Referring to More Than a Single Cell
- Understanding Operator Precedence
- Using Exponents in Formulas
- Exploring Functions
- Formatting Your Spreadsheets
- Defining Custom Format Styles
- Leveraging Copy, Cut, Paste, and Paste Special
- Using Cell Names (Like Programming Variables)
- Validating Data
- Taking Advantage of Macros
- Adding Comments and Equation Notes
- Getting Help
Getting Acquainted with Visual Basic for Applications
- Introduction
- Navigating the VBA Editor
- Writing Functions and Subroutines
- Working with Data Types
- Defining Variables
- Defining Constants
- Using Arrays
- Commenting Code
- Spanning Long Statements over Multiple Lines
- Using Conditional Statements
- Using Loops
- Debugging VBA Code
- Exploring VBAs Built-in Functions
- Exploring Excel Objects
- Creating Your Own Objects in VBA
- VBA Help
Collecting and Cleaning Up Data
- Introduction
- Importing Data from Text Files
- Importing Data from Delimited Text Files
- Importing Data Using Drag-and-Drop
- Importing Data from Access Databases
- Importing Data from Web Pages
- Parsing Data
- Removing Weird Characters from Imported Text
- Converting Units
- Sorting Data
- Filtering Data
- Looking Up Values in Tables
- Retrieving Data from XML Files
Charting
- Introduction
- Creating Simple Charts
- Exploring Chart Styles
- Formatting Charts
- Customizing Chart Axes
- Setting Log or Semilog Scales
- Using Multiple Axes
- Changing the Type of an Existing Chart
- Combining Chart Types
- Building 3D Surface Plots
- Preparing Contour Plots
- Annotating Charts
- Saving Custom Chart Types
- Copying Charts to Word
- Recipe 4-14. Displaying Error Bars
Statistical Analysis
- Introduction
- Computing Summary Statistics
- Plotting Frequency Distributions
- Calculating Confidence Intervals
- Correlating Data
- Ranking and Percentiles
- Performing Statistical Tests
- Conducting ANOVA
- Generating Random Numbers
- Sampling Data
Time Series Analysis
- Introduction
- Plotting Time Series Data
- Adding Trendlines
- Computing Moving Averages
- Smoothing Data Using Weighted Averages
- Centering Data
- Detrending a Time Series
- Estimating Seasonal Indices
- Deseasonalization of a Time Series
- Forecasting
- Applying Discrete Fourier Transforms
Mathematical Functions
- Introduction
- Using Summation Functions
- Delving into Division
- Mastering Multiplication
- Exploring Exponential and Logarithmic Functions
- Using Trigonometry Functions
- Seeing Signs
- Getting to the Root of Things
- Rounding and Truncating Numbers
- Converting Between Number Systems
- Manipulating Matrices
- Building Support for Vectors
- Using Spreadsheet Functions in VBA Code
- Dealing with Complex Numbers
Curve Fitting and Regression
- Introduction
- Performing Linear Curve Fitting Using Excel Charts
- Constructing Your Own Linear Fit Using Spreadsheet Functions
- Using a Single Spreadsheet Function for Linear Curve Fitting
- Performing Multiple Linear Regression
- Generating Nonlinear Curve Fits Using Excel Charts
- Fitting Nonlinear Curves Using Solver
- Assessing Goodness of Fit
- Computing Confidence Intervals
Solving Equations
- Introduction
- Finding Roots Graphically
- Solving Nonlinear Equations Iteratively
- Automating Tedious Problems with VBA
- Solving Linear Systems
- Tackling Nonlinear Systems of Equations
- Using Classical Methods for Solving Equations
Numerical Integration and Differentiation
- Introduction
- Integrating a Definite Integral
- Implementing the Trapezoidal Rule in VBA
- Computing the Center of an Area Using Numerical Integration
- Calculating the Second Moment of an Area
- Dealing with Double Integrals
- Numerical Differentiation
Solving Ordinary Differential Equations
- Introduction
- Solving First-Order Initial Value Problems
- Applying the Runge-Kutta Method to Second-Order Initial Value Problems
- Tackling Coupled Equations
- Shooting Boundary Value Problems
Solving Partial Differential Equations
- Introduction
- Leveraging Excel to Directly Solve Finite Difference Equations
- Recruiting Solver to Iteratively Solve Finite Difference Equations
- Solving Initial Value Problems
- Using Excel to Help Solve Problems Formulated Using the Finite Element Method
Performing Optimization Analyses in Excel
- Introduction
- Using Excel for Traditional Linear Programming
- Exploring Resource Allocation Optimization Problems
- Getting More Realistic Results with Integer Constraints
- Tackling Troublesome Problems
- Optimizing Engineering Design Problems
- Understanding Solver Reports
- Programming a Genetic Algorithm for Optimization
Introduction to Financial Calculations
- Introduction
- Computing Present Value
- Calculating Future Value
- Figuring Out Required Rate of Return
- Doubling Your Money
- Determining Monthly Payments
- Considering Cash Flow Alternatives
- Achieving a Certain Future Value
- Assessing Net Present Worth
- Estimating Rate of Return
- Solving Inverse Problems
- Figuring a Break-Even Point
Index
EAN: 2147483647
Pages: 206
