General Computer Science for Engineers CISC 106 Lecture 02

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# General Computer Science for Engineers CISC 106 Lecture 02 - PowerPoint PPT Presentation

General Computer Science for Engineers CISC 106 Lecture 02. James Atlas Computer and Information Sciences. How does our program work?. CPU Disk Memory. Our Program in Memory. x86 instructions. ~~~~~~~~~~ ~~~~~~~~~~ ~~~~~~~~~~ ~~~~~~~~~~ ~~~~~~~~~~ ~~~~~~~~~~ ~~~~~~~~~~ ~~~~~~~~~~

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### General Computer Science for EngineersCISC 106Lecture 02

James Atlas

Computer and Information Sciences

Our Program in Memory

x86 instructions

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• . . .
Variables
• var = expression
• x = 2 * 2
• comment = ‘This is a string’
• area = circleArea(5)

What type of data is stored in each variable?

How do computers store data?
• Binary
• Billions of tiny logic gates representing ON and OFF (1 and 0)
• Video
Data Types in Matlab
• Floating point number by default
• “double” precision = 64-bits of memory
Operations on Data Types
• 5.5
• single(5.5)
• int8(5)
• int8(500) ?
• int8(‘c’) ?
• char(98) ?

>> x = 5.5

>> whos x

Expressions
• Data and Operator
• 2 + 2
• circleArea(5)
Expressions
• Data and Operator
• 2 + 2
• circleArea(5)
• Nested Expressions
• circleArea(circleArea(5 + 2) + circleArea(3))
Expressions
• Data and Operator
• 2 + 2
• circleArea(5)
• Nested Expressions
• circleArea(circleArea(5 + 2) + circleArea(3))
• Expressions produce a value
Using Matlab Remotely (text)
• requires an ssh program such as PuTTY
• see course website for installation details
• at prompt type:

matlab -nodesktop

Using Matlab Remotely (GUI)
• Mac users:
• You already have an X-Windows environment
• PC users:
• You must setup Cygwin-X