How to change saved image size in Matlab

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’

^ (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

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

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

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

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

saveas(gcf,’test.png’)

saveas(gcf,’test.fig’)

openfig(‘test.fig’)

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