Plotting

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• Questions?
• Plotting
  • Sections 6.3 - 6.4
    • How to use plots with 1 or 2 arrays
    • Order in array may not matter but does affect appearance of line
    • Variations to use with plotting
      • Can change axes, title axes, etc.
    • Can plot multiple sets of data in same graph
      • subplot function
  • Examples
    

    >> % x^2 from -3 to 3
    >> xs = linspace( -3, 3, 200 );
    >> ys = xs .^ 2;
    >> plot( xs, ys )
    >> ylabel( 'x^2' )
    % Put y = 2x on same axes
    >> hold on
    >> plot( [-3, 3], [2 * -3, 2*3 ] )
    >> axis( [ -3, 3, 0, 9 ] )
    >> hold off
    >> clf    % Erase contents of figure window
    >> % x(t) = sin(2t), y(t) = cos(3t)
    >> xs = sin( 2 * linspace( 0, 2*pi, 20 ) );    % Jagged plot, not enough points
    >> ys = cos( 3 * linspace( 0, 2*pi, 20 ) );
    >> plot( xs, ys )
    >> ys = cos( 3 * linspace( 0, 2*pi, 200 ) );   % Smooth plot
    >> xs = sin( 2 * linspace( 0, 2*pi, 200 ) );
    >> plot( xs, ys )

• Plotting Lab
  • Handout
• Next
  • Parametric equations
  • Watch (required) video on parametric equations and plotting at https://www.youtube.com/watch?v=tsnHL1Lb5MU

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