MATLAB Programming

Resizing and Reshaping Matrices
Expanding a Character Array. You can expand character arrays in the
same manner as other MATLAB arrays, but it is generally not recommended.
MATLAB expands any array by padding uninitialized elements with zeros.
Because zero is interpreted by MATLAB and some other programming
languages as a string terminator, you may find that some functions treat the
expanded string as if it were less than its full length.
Expand a 1-by-5 character array to twelve characters. The result appears
atfirsttobeatypicalstring:
greeting = 'Hello';
greeting =
Hello World
greeting(1,8:12) = 'World'
Closer inspection however reveals string terminatorsatthepointofexpansion:
uint8(greeting)
ans =
72 101 108 108 111 0 0 87 111 114 108 100
This causes some functions, like strcmp, to return what might be considered
an unexpected result:
strcmp(greeting, 'Hello
ans =
0
World')
Diminishing the Size of a Matrix
Youcandeleterowsandcolumnsfromamatrixbyassigningtheemptyarray
[] to those rows or columns. Start with
A = magic(4)
A =
16 2 3 13
5 11 10 8
9 7 6 12
4 14 15 1
Then, delete the second column of A using
A(:, 2) = []
1-31