Fan Chang's Blog

How to change saved image size in Matlab

ucsdnemo — Mon, 15 Aug 2011 21:27:39 +0000

There is two ways to do this.

1. Use separate “set” command to change the output size

figure(1)
screen=[100,100,1536,864];
set(figure(1),’Position’,screen);
set(figure(1),’PaperPosition’,[0 0 8.5 11.0]; %usletter
set(figure(1),”PaperPositionMode’,'Auto’);

2. Use figure command

screen=[100,100,1536,864];
figure1=figure(‘PaperPositionMode’,'Auto’,'PaperPosition’,[0 0 8.5 11.0],’Position’,screen)

Unix command ‘grep’

ucsdnemo — Thu, 07 Jul 2011 17:29:39 +0000

^ (Caret)        =    match expression at the start of a line, as in ^A.
$ (Question)     =    match expression at the end of a line, as in A$.
\ (Back Slash)   =    turn off the special meaning of the next character, as in \^.
[ ] (Brackets)   =    match any one of the enclosed characters, as in [aeiou].
                      Use Hyphen “-” for a range, as in [0-9].
[^ ]             =    match any one character except those enclosed in [ ], as in [^0-9].
. (Period)       =    match a single character of any value, except end of line.
* (Asterisk)     =    match zero or more of the preceding character or expression.
\{x,y\}          =    match x to y occurrences of the preceding.
\{x\}            =    match exactly x occurrences of the preceding.
\{x,\}           =    match x or more occurrences of the preceding.

CellArray in matlab

ucsdnemo — Tue, 28 Jun 2011 17:07:59 +0000

a={‘test’,'Test’} %creat cell array
b=[1 2;3 4;5 6];

c=cat(1,a,num2cell(b)); %combine two different cellarray

xlswrite(‘test2.xls’,c) %write to excel file

Histogram equalization

ucsdnemo — Fri, 17 Jun 2011 19:16:35 +0000

Learn how to write Matlab and Python script to equalize the histogram of the image.

Useful Matlab function call

nextpow2
intlut
im2gray
cumsum
cdfplot

Extract data from matlab fig

ucsdnemo — Thu, 07 Apr 2011 03:55:28 +0000

open(‘test.fig’)

h=gcf;

line=findall(h,’type’,'line’);

xdata=get(line(2),xdata);

ydata=get(line(2),ydata);

How to save text file in matlab

ucsdnemo — Sat, 02 Apr 2011 00:55:36 +0000

Use “csvwrite” or “dlmwrite” to write file

Use “csvread” or “dlmread” to read file

Or simply use “save” and “load”

http://www.mathworks.com/help/techdoc/ref/f16-5702.html#f16-14491

How to save fig or png in matlab

ucsdnemo — Sat, 02 Apr 2011 00:49:51 +0000

saveas(gcf,’test.png’)

saveas(gcf,’test.fig’)

openfig(‘test.fig’)

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ucsdnemo — Fri, 01 Apr 2011 05:24:46 +0000

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ucsdnemo — Fri, 01 Apr 2011 05:23:53 +0000

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ucsdnemo — Fri, 01 Apr 2011 05:23:23 +0000

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