Sem01!26!01 Jordan Rosenthal

7/30/2019 Sem01!26!01 Jordan Rosenthal

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The Center for Signal & Image Processing Georgia Institute of Technology

26-Jan-2001

Creating and Exporting

Matlab Figures

Jordan Rosenthal

What you might not know, but should!


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The Center for Signal & Image Processing2

26-Jan-2001jr

Purpose

Introduce you to

commands

techniques

you may not have seen before.

Somewhat random in nature

Convince you it's easy to do (let's hope!)

Not so much a tutorial as it is a survey


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26-Jan-2001jr

Creating Matlab Figures

Editing axes and text objects

Can change many properties without code

Run the following code

Change the line style and width

Change the axis title, x label, y label Change fonts

Add a grid

Annotate

Etc.

Matlab 5.3 (R11) Interactive features:

ezplot('cos(x)');


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Useful functions available for download:

sTitle = {'a','b','c','d'}

for i = 1:4

subplot(2,2,i);

imagesc(rand(16));

title( sTitle{i} );

end

pause;

suptitle('Main title');

suptitle.m : puts a title above all subplots


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Useful functions available for download:

arrow demo;

arrow.m : add an arrow to a plot

clf;

axis([-5 5 -5 5]);arrow([-4 -3],[2 3]);

arrow demo2;


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Adding LaTeX-like symbols to a plot:

clf;

h = remez(30,[0 0.4 0.6 1],[1 1 0 0]);

[H,w] = freqz(h);

plot( w/pi, abs(H) );

title('| H(e^{j\omega}) |');

xlabel('\omega / \pi');

Only a subset of LaTeX supported, but still useful


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Using FILL to create polygons:

clf;

ang = 2*pi/6 * ( 0 : 5 );

r = ones(1,6);

[x,y] = pol2cart(ang,r);

fill(x,y,'r','EdgeColor','k','LineWidth',3);

axis([-2 2 -2 2]);axis equal;

view(3);


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EASY to use lighting and visualization commands:

figure('Pos',[550 350 560 420]) ;

surf(peaks); axis tight; pause;

camlight headlight; pause;

shading interp; pause;

lighting phong; pause;

material metal; pause;

material shiny; pause;colorbar; pause;

colormenu;


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How to save on ink: (this plot still needs a little work)

cla; colormap(jet);

h = fspecial('average',7);

[H,w1,w2] =freqz2(h);

surfl(w1,w2,abs(H),'light');

shading interp; lighting phong;

colorbar;

colormap(gray); pause;

colormap(1-gray);

colormap( 1-rgb2gray(jet) ); pause;

brighten(0.5); pause;

material dull;


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Export Problems

Property Export Problem

size plots too large and must be scaled down indocument

color want black and white, grayscale, or CMYKcolor

line widths typically too thin

font sizes typically wrong size

Problems when exporting to documents:


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Export Example 1

x = 0 : 0.1 : 20;

y = sin(x);plot(x,y);

axis([0 20 -2 2]);

grid on;

cd z:\Staff\jr\MatlabPres;

print -deps2 example1.eps;

1)

2) Adjust aspect ratio

3)

4)Wrong aspect ratio

Show example1.eps

in GhostView
http://localhost/var/www/apps/conversion/releases/20121107221618/tmp/scratch_4/example1.epshttp://localhost/var/www/apps/conversion/releases/20121107221618/tmp/scratch_4/example1.epshttp://localhost/var/www/apps/conversion/releases/20121107221618/tmp/scratch_4/example1.eps


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Export Example 1

A better way:

exportfig(gcf,'example1a.eps','width',6,...

'fontmode','fixed','fontsize',10);

Show example1a.eps

Usual Solution:

Scale plot in document
http://localhost/var/www/apps/conversion/releases/20121107221618/tmp/scratch_4/example1a.epshttp://localhost/var/www/apps/conversion/releases/20121107221618/tmp/scratch_4/example1a.eps


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Export Example 2

x = 0 : 0.1 : 20;

y1 = sin(x); y2 = cos(x);plot(x,y1,x,y2);

legend('sin','cos');

axis([0 20 -2 2]);

grid on;title('Plot of sin and cos');

exportfig(gcf,'example2.eps', ...

'linestylemap','bw');

1)

2) Adjust aspect ratio (note colors)

3)

Show example2.eps4)
http://localhost/var/www/apps/conversion/releases/20121107221618/tmp/scratch_4/example2.epshttp://localhost/var/www/apps/conversion/releases/20121107221618/tmp/scratch_4/example2.eps


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ExportFig Features

Can set session defaults

Can change height, width, or both

Can change color space

Can lock axes limits and ticks before export Fonts can scale with size or be fixed to a point size

Can use 'latin1' or 'adobe' character encoding

Line widths can be fixed or scaled and min/max

widths can be set Line style can be automatically mapped or mapped

according to user preferences

Can separate text into its own eps file

e.g., use bitmap image and overlay vectorized text

Everything you want from PRINT and more


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Helper Files

PREVIEWFIG Preview a figure before exporting

APPLYTOFIG

Apply export options to a figure

RESTOREFIG

Restore figure to previous state


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Importing into LaTeX

\usepackage{graphicx}

...\begin{figure}

\centering

\includegraphics{myfig.eps}

\caption{The figure caption}

\label{fig:CoolFigure}

\end{figure}

"Using Imported Graphics in LaTeX 2"

epslatex.ps, http://www.ctan.org

Everything

you need toknow


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Importing into PowerPoint

PowerPoint does not support EPS

Can only display EPS files with a raster preview,typically TIFF

large files, sometimes causing memory problems

Use PNG, JPEG instead

Sometimes Matlab's Export menu works fine for this

Use EXPORTFIG

Yes, usually this means one file for visual

presentation and one for written paper


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PowerPoint "Dissolve" Example


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opt = struct('format','png','width',5, ...

'fontmode','fixed','fontsize',10, ...

'color','rgb');

surf(peaks);

exportfig(gcf,'example3a.png',opt);

shading interp;

exportfig(gcf,'example3b.png',opt);

camlight headlight; lighting phong;

exportfig(gcf,'example3c.png',opt);


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Creating the dissolve:

Insert --> Picture --> From File

(PNGs were 10-30 kB)

(EPS with TIFF were 340-2500 kB!)

Place on top of each other

Slide Show --> Custom Animaton

Animate pictures on mouse click

Set effect to "dissolve"


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References

Matlab command help

ezplot, fill, surf, camlight, lightangle, shading, lighting,material, colorbar, colormap, brighten

User contributed files

http://www.mathworks.com/support/ftp/graphicsv5.shtml

suptitle.m, arrow.m

Matlab Digest Articles

Part I(http://www.mathworks.com/company/digest/june00/export/)

Part II(http://www.mathworks.com/company/digest/december00/export.shtml)

exportfig.m (updated), previewfig.m, applytofig.m, restorefig.m

Documents

Sem01!26!01 Jordan Rosenthal