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Understanding Computer Variables and Data Storage

Learn about CPU, disk, memory, x86 instructions, data types, operations, and expressions in computers. Explore storing data in variables and executing MATLAB tasks remotely.

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Understanding Computer Variables and Data Storage

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  1. General Computer Science for EngineersCISC 106Lecture 02 James Atlas Computer and Information Sciences

  2. How does our program work? • CPU • Disk • Memory

  3. Our Program in Memory x86 instructions • ~~~~~~~~~~ • ~~~~~~~~~~ • ~~~~~~~~~~ • ~~~~~~~~~~ • ~~~~~~~~~~ • ~~~~~~~~~~ • ~~~~~~~~~~ • ~~~~~~~~~~ • . . .

  4. Variables • var = expression • x = 2 * 2 • comment = ‘This is a string’ • area = circleArea(5) What type of data is stored in each variable?

  5. How do computers store data? • Binary • Billions of tiny logic gates representing ON and OFF (1 and 0) • Video • http://www.youtube.com/watch?v=b6vHZ95XDwU

  6. Data Types in Matlab • Floating point number by default • “double” precision = 64-bits of memory

  7. Operations on Data Types • 5.5 • single(5.5) • int8(5) • int8(500) ? • int8(‘c’) ? • char(98) ? >> x = 5.5 >> whos x

  8. Expressions • Data and Operator • 2 + 2 • circleArea(5)

  9. Expressions • Data and Operator • 2 + 2 • circleArea(5) • Nested Expressions • circleArea(circleArea(5 + 2) + circleArea(3))

  10. Expressions • Data and Operator • 2 + 2 • circleArea(5) • Nested Expressions • circleArea(circleArea(5 + 2) + circleArea(3)) • Expressions produce a value

  11. Lab00 (pre-lab) / Lab01

  12. Using Matlab Remotely (text) • ssh yourusername@strauss.udel.edu • requires an ssh program such as PuTTY • see course website for installation details • at prompt type: matlab -nodesktop

  13. Using Matlab Remotely (GUI) • Mac users: • You already have an X-Windows environment • PC users: • You must setup Cygwin-X • Download Cygwin setup.exe from: http://www.cygwin.com/ • Run setup.exe and select additional packages for: • xauth • xinit • openssh

  14. Running Matlab Remotely • Once the X-Windows environment is setup, open a terminal window and login to strauss: • ssh -YC yourusername@strauss.udel.edu • Now start Matlab: • matlab & • What does the & do?

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