SUNY Geneseo Department of Computer Science

“If” Statements, Day 1

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Misc

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Project 2: Comments matter!

• Do… write comments that explain the overall purpose of your program, non-obvious “tricks” in the code, the algorithmic ideas behind it, what variables represent, etc.
• Do Not… write comments that repeat what the code already says, repeat blocks of text from handouts, etc.
• Example of a commented script

Questions?

Quiz 5

Solutions

• Questions 1 and 2

        >> x = 7;
        if x > 1
        fprintf( 'Hello\n' )
        else
        fprintf( 'Goodbye\n' )
        end
        Hello
        >> if x > 10
        fprintf( 'Yes\n' )
        elseif x > 5
        fprintf( 'Maybe\n' )
        else
        fprintf( 'No\n' )
        end
        Maybe

• Question 3

• The big problem for this vis a vis bisection is that it is discontinuous
• Technically it should also have opposite signs at the endpoints of the interval

“If” Statements

Demo

• The orbits of Earth and Mars

• Distance between Earth and Mars vs time (blue), and derivative of distance (green, scaled to be visible)

See handout for lesson details