Lesson 6:
basic plots
Lesson 6 Outline:
Plot 1-basic plot commands
1) Figure
Line style
Marker style
Labels and Titles
Axes
Matlab help
LineSpec (colors, marker styles, line styles)
2) Matlab program for basic plots
line plots:
1D with time
Multiple data sets 1D across time
scatter plots: 2D
bar plots : Hx
3) Subplots
4) Managing plots
visible off
pause
saveas
5) Play with zoom
L6_plots.m
x=rand(20,10);
figure
plot(x(:,10))
plot(x(:,9))
hold on
plot(x(:,10),’r’)
figure
plot(x(:,5),'--b','LineWidth',2)
hold on
plot(x(:,4),':ko','LineWidth',2)
close all
plot(x(:,3),'-md','LineWidth’ 2, 'MarkerEdgeColor’, 'k',
'MarkerFaceColor', 'g', 'MarkerSize', 10)
MatLab help
search
 LineSpec
colors
line styles
marker styles
5 minutes to play
axis([xmin xmax ymin ymax])
axis([1 25 -1 1])
xlabel(‘time')
ylabel(’column_5')
title(’random x plot')
L6_plots.m
open the m file from your current directory
run the program
Uncomment the next plot command
highlight lines 35-45
right click and “uncomment”
save
Let’s look at the code
plot(x,'b')
hold on
plot(y,'r')
hold on
What are we plotting?
Is it a line?
What color?
Are there markers?
Run the program and see if you were correct.
Uncomment the next plot command
highlight lines 48-54
right click and “uncomment”
save
Let’s look at the code
plot(x,y,'b*');
What are we plotting?
Is it a line?
What color?
Are there markers?
Run the program and see if you were correct.
Uncomment the next plot command
highlight lines 58-61
right click and “uncomment”
save
Let’s look at the code
hist(z)
What are we plotting?
Is it a line?
What color?
In command window type
Are there markers?
help hist
Run the program and see how it looks.
What is the default bin size?
Try changing the bin size
hist(z,25)
hist(z,50)
Uncomment the next plot command
highlight lines 65-72
right click and “uncomment”
save
Let’s look at the code
subplot(3,2,1);plot(x,’r’);
subplot(3,2,2);plot(y,’b’);
subplot(3,2,3);plot(x2,’-rd’);
subplot(3,2,4);plot(y2,’:mo’);
subplot(3,2,5);plot(x3,’- -k’);
subplot(3,2,6);plot(y3, ‘-.g’);
What are we plotting?
Is it a line?
What color?
Are there markers?
Run the program and see if you were correct.
subplot(3,2,1);
subplot(3,2,2);
subplot(3,2,3);
subplot(3,2,4);
subplot(3,2,5);
subplot(3,2,6);
3 rows
2 columns
6 plots
Managing figures
How many figures were made when you ran the program?
where are they?
“pause”
stops the program
put a pause after each figure (copy and paste line 76)
Save
run the program
What if you do not want to see the figures?
How can you save them to a file?
fig_x=figure;
creating a figure “handle”
set(fig_x,’visible’,’off’)’;
copy and paste line 75
adjust figure “handle” for this line
% pause
be sure to comment out the pauses
saveas(fig_x,[outpath,’xy_scatter.tif’]);
copy and paste line 77
adjust figure “handle” and name of file
Using zoom on Matlab plots
Click on zoom at top of figure
+
Select area you want enlarged
Save as
Enjoy playing with Matlab plots!!!