1. EGR106 Week 4 Two Dimensional Plots Multiple Plots Plot Formatting Homework

2. Two Dimensional Plots Line type plot(x,y,’--’) gives a dashed line Line color plot(x,y,’g’) gives a green line Line thickness Markers plot(x,y,’--r*’,’linewidth’,2,’markersize’,12) Dashed red line with * marker

3. Multiple Plots Plot(x, y1, x, y2) Plots y1 and y2 vs x hold on Keeps the plot window open for additional lines on the same plot hold off Stops writing to the plot subplot(n,m,k) Selects plot k in an nxm array of plots. Used for multiple plots on the same page.

4. Plot Formatting xlabel, ylabel xlabel(‘time (sec)’) title title(‘Problem 3 Solution’) text text(x,y,’your message at coordinates x,y’) legend legend(‘first curve’,’second curve’) –used for multiple curves on a single plot

5. Plot Formatting Subscripts and superscripts Greek letters Rotating text

6. Line Properties and Values plot(x,y, 'linewidth',5 ) line width is 5 “points”

7. >> x=0:2:10; >> y=x.^2; >> plot(x,y,'--r*','linewidth',2,'markersize',12) >> text(2,50,'\fontsize{30} \alpha Profit= x^2 ', 'rotation',45)

8. Line Specifiers plot(x,y, ' r : d ' ) red dotted line diamonds

9. Multiple Plots on the Same Axes Plot allows multiple sets of arrays and line specifiers: Note colors rotate

10. Two Useful Commands figure –alone it opens a new window –figure(n) takes you to window n ginput(1) –creates crosshairs on the screen –returns (x,y) location of cursor at mouse click –ginput(n) returns n pairs of locations

11. Formatting Plots – The Axes Adding a grid grid Setting the axis limits: axis( [ xmin xmax ymin ymax ] )

12. Formatting Plots – Adding Text Week 1: –xlabel( 'string' ) –ylabel( 'string' ) –title( 'string' ) –text( x, y, 'string' ) New: –gtext( 'string' ) – cursor controlled –legend( 'string1', … 'stringn', loc)

13. Multiple Axes in One Figure - Subplot subplot(2,2,1) plot(x1,y1) subplot(2,2,2) etc. Argument is rows, columns, choice

14. Click on the arrow to start interaction Double click on some part of the figure to initiate choices

15. Modify text: Or the lines themselves:

16. Other Types of 2-D Plots - Polar x = 1:100; r = log10(x); t = x/10; polar( t, r ) magnitude angle in radians

17. Other Notes Line specifiers, properties, axis, grid, … work on many of the plot types Most of these tools have additional features – use the help function 3-dimensional plots are available (chapter 9) with viewpoint options