ME 142 Engineering Computation I Variables, Equations & Functions Introduction to Basic Programming Language.

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Presentation transcript:

ME 142 Engineering Computation I Variables, Equations & Functions Introduction to Basic Programming Language

Key Concepts Defining Variables & Equations Launching VBA Programming Basics

Defining Variables & Equations

What is a Variable?

Variables  A named element that stores information or data  Variable examples: A=2.45 X=Y+Z I=I+1 B=“Hello Class”

Basic Math Operators  Same as used in Excel spreadsheets +add -subtract *multiply /divide ( )parenthesis ^exponent

Launching VBA

Enabling the Developer’s Ribbon

Launching VBA  Enable Developer’s Tab Once enabled, should remain enabled  Select Visual Basic from Developer’s Tab

Launching VBA  Right click on Project…  Select Insert/Module

Launching VBA Congratulations, you’re ready to begin programming!

Programming Basics

Example VBA Function Function demo(a,b)' (Input) 'An example program to add two numbers 'Add 2 numbers (Process) c = a + b 'Return results (Output) demo= c End Function

Executing a VBA Function

Saving a VBA Program  How do you save a program?  What is a macro-enabled workbook?  Where is the program saved?  How do I retrieve a program?  What is this error about macros that I get when I try to open my saved excel file?

Excel/VBA Tip  The VBA Function worksheetfunction may be used to call Excel function: P=worksheetfunction.pi D=worksheetfunction.degrees(x)

Example Problem  Develop a VBA function to calculate the volume of a sphere, given its radius, r. Volume = 4 * π * r 3 / 3  Use your new VBA function within Excel to find the total volume of the metal used to make the cannonball pyramid below, given d=4.5”

Review Questions

I-Clicker Question Variables Which of the following variable assignments are valid: A.x = y + z B.y + z = x C.Both are valid variable assignments D.Neither are valid variable assignments

I-Clicker Question Launching VBA The shortcut to launch the VBA editor is: A.Alt + V + B B.F7 C.Alt + F11 D.None of the above E.There is no shortcut

I-Clicker Question Running VBA In the first line of a function, the parenthesis immediately after the function name may be omitted: A.True B.False

Homework Help ‘n Hints