MATLAB Text Strings - Miami University
[Pages:121]MATLAB Text Strings
Greg Reese, Ph.D Research Computing Support Group Academic Technology Services Miami University
MATLAB Text Strings
? 2010-2013 Greg Reese. All rights reserved
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Content
Major sections ? Character arrays ? Formatted text ? String arrays ? Miscellaneous
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Strings
MATLAB has two different types of text strings ? character arrays and cell arrays ? Main internal difference is how stored in
memory ? User manipulates two types slightly
differently Character arrays - best when considering individual letters of text Cell arrays - best when considering words
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Character Arrays
Text stored in two-dimensional array Key point ? All rows must have same number of columns ? If not enough text in a row, row is
padded on right with blanks, i.e., MATLAB adds enough space characters to end of text to make row correct length
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Character Arrays
I
a m Sa m
Sa m I
a m
Do y o u l i k e
Gr e e n e g g s a n d
h a m
Four lines of text stored in a 4x18 array
MATLAB makes all rows as long as longest row
? First three rows above have enough space characters added on ends to make each row 18 characters long
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Character Arrays
ASIDE Each character actually occupies two bytes of memory because MATLAB accepts Unicode ? Unicode is common standard for
working with non-English languages ? For more information, search for
"Unicode" in MATLAB help system
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Character Arrays
I
a m Sa m
Sa m I
a m
D o
y o u
l i ke
Gr e e n
e g g s
a n d
h a m
Pros
? Internally simple
? Can easily use with MATLAB functions that operate on arrays, e.g., >> num_a = sum(seuss(:) == 'a')
ans = 6
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