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General Computer Science for Engineers CISC 106 Lecture 05

Learn how to start Matlab from the command line, use simple commands, loops (For and While), and If statements.

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General Computer Science for Engineers CISC 106 Lecture 05

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  1. General Computer Science for EngineersCISC 106Lecture 05 Dr. John Cavazos Computer and Information Sciences 2/20/2009

  2. Lecture Overview • How to start Matlab from the command line • How to use simple command line commands for Matlab • How to use For and While loops • How to use If statements

  3. Matlab from the Command Line On strauss you have access to the GUI version of matlab If you have a Mac you can access the GUI using a few simple commands On a PC accessing the GUI version of matlab takes a bit more work.... so we use matlab from the command line

  4. Matlab from the Command Line • Command line version of matlab: • ssh username@strauss.udel.edu • then type matlab –nodesktop • GUI version use: • ssh –X username@strauss.udel.edu • then type matlab

  5. Matlab from the Command Line Now lets try some basic commands: > 4^2 will return 16 >a=5; will show nothing, the “;” suppresses output > a will return 5

  6. Matlab from the Command Line >clc will clear the screen >clear will clear all variables

  7. Loops Basic loops: FOR loop and WHILE loop The FOR loop executes a set of commands a predetermined number of times with a predetermined index the WHILE loop executes a command or a set of commands until a certain predetermined condition is met

  8. FOR Loops When you type: > for i=1:3, i end It will return: > i = 1 > i = 2 > i = 3

  9. FOR Loops When you type: > for i=1:3 i=i*2; i=i+5 end It will return: > i = 7 > i = 9 > i = 11

  10. FOR Loops examples • Print a list of numbers forward • only when greater than some number • Print a list of numbers backward • only when greater than some number

  11. WHILE Loops When you type: > i = 3; > while (i >0)‏ i i = i-1; end It will return: > i = 3; > i = 2; > i = 1;

  12. WHILE Loops When you type: > i = 16; > while (i >1)‏ i= i/2 end It will return > i = 8; > i = 4; > i = 2;

  13. IF Statements • IF statements allow program to make choices whether a condition is met or not • Basic if statement if expression1 statements1 elseif expression2 statements2 else statements3 end

  14. IF Statements • IF statements can be used with or without • the ELSEIF and ELSE parts If you type: > x = 5 > if (x == 5)‏ 200 end It will return: > 200

  15. IF Statements > x = 8 > if (x == 5)‏ 200 elseif (x == 4)‏ 300 else 400 end Will return: > 400

  16. Putting For loops and Ifs together for j = 1:10 if (j > 5) j end end Will print what?

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