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Designing Effective Graphics Using MATLAB

Designing Effective Graphics Using MATLAB. The Cain Project in Engineering and Professional Communication Linda Driskill, driskila@ruf.rice.edu Gang Cheng, gang@rice.edu. The Purpose of Using Graphs. In problem solving As part of design As analysis of operating data

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Designing Effective Graphics Using MATLAB

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  1. Designing Effective Graphics Using MATLAB The Cain Project in Engineering and Professional Communication Linda Driskill,driskila@ruf.rice.edu Gang Cheng,gang@rice.edu

  2. The Purpose of Using Graphs • In problem solving • As part of design • As analysis of operating data • For persuasion and interpretation • Dramatize relationships • Promote identification • Make complex information accessible

  3. Checklist for Good Graphics • Purpose clear? • Critical components defined? • Pattern and arrangement lead eye without distraction? • Graphic hierarchy consistent? • Fonts legible? • Presenter’s expertise shown?

  4. Types of Graph in Matlab • Line graph • 2D • 3D • Bar graph • Pie graph • Ribbon graph

  5. Considerations • Purpose • Problem solving? • Persuasion and interpretation? • Audience • What are their background? • What are they interested to know? • Context • Presentation? • Report/Paper?

  6. Context • Presentation • Big fonts • Can use any color • Can use animation • Report • Smaller fonts • Often just black and white • Animation impossible

  7. An Example • You have: • Vector 1: x[0:0.2:10]; • Vector 2: sin(x); • Vector 3: cos(x); • You are asked to: • Plot sin(x) vs. x and cos(x) vs. x in the same figure; • Customize the figure so that it becomes suitable for being used in a presentation. • Customize the figure so that it becomes suitable for being used in a report/paper.

  8. A Simple Matlab Program %start clear all; %clear the memory X=[0:0.2:10]; %define the x vector sinx=sin(x); %calculate sin(x) cosx=cos(x); %calculate sin(x) plot(x,sinx,x,cosx); %plot the lines xlabel('x'); %add x label ylabel('y'); %add y label title([‘sin and cos Functions']); %add title %end

  9. Default Figure Given by Matlab

  10. We Want … • Titles and labels bigger. • Lines thicker. • Colors more contrasting. • Insert Legend. • Data points shown. • Try adding gridlines.

  11. title Y label X label Tick and tick label Anatomy of a Matlab Figure Axes lines

  12. Figure Properties Open the Property Editor

  13. Figure Immediate apply Edit Figure Properties

  14. axes Edit Axes Properties

  15. line Edit Line Properties

  16. A Better-Looking Figure

  17. legend Insert Legend

  18. Legend Inserted Select object

  19. Make Room for Legend

  20. legend Edit Legend Properties

  21. axes Grid Show Insert Y Grid Line

  22. Final

  23. Figure for Report/Paper

  24. Frequently Used Functions • “plot” • “xlabel”,“ylabel” • “title” • “xlim”, “ylim” • “axis” • “legend” • “errorbar” • Type “help function name” in Matlab command window for detailed information on the usage of the function.

  25. Other 2D Plotting Functions • “loglog”: graph with logarithmic scales for both axes. • “semilogx”: graph with a logarithmic scale for x-axis and a linear scale for y-axis. • “semilogy”: graph with a logarithmic scale for y-axis and a linear scale for x-axis. • “plotyy”: graph with y-tick labels on the left and right side.

  26. A Whole Lot More … • 2D contour • “contour” • “contourslice” • 3D plots • “plot3” • “mesh” • “surf” • Movie • “getframe” • “movie”

  27. A Bioartificial Tissue Seeded with Cells Z = 40 Z = 1 Sample Movie A movie created with mesh, getframe and movie

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