Graphics Programs Reference
In-Depth Information
>> whos
Name Size Bytes Class
t 4x1 658 cell array
Grand total is 149 elements using 658 bytes
>> t(1)
ans =
'O sacred receptacle of my joys,'
>> t{1}
ans =
O sacred receptacle of my joys,
>> t{1}(1)
ans =
O
>> t{1}(1:8)
ans =
O sacred
Let us add another element to the cell array by putting a 3
×
3 matrix
in the first row of the second column:
>> t{1,2} = spiral(3)
t=
[1x31 char] [3x3 double]
[1x34 char] []
[1x41 char] []
[1x39 char] []
matlab has filled the rest of the cells in column 2 with empty cells. We
used the curly brackets
t{1,2}
to refer to that particular cell. If we had
used ordinary round brackets, we would have produced an error:
>> t(1,2) = spiral(3)
??? Conversion to cell from double is not possible.
This is because there is a difference between indexing
cells
and indexing
their
contents
. For example, to extract the word “virtue” from the second
line of the quotation in the first column, we need to access the
cell
{2,1}
,
then get characters 15 to 20 from that cell's
contents
:
>> t{2,1}(15:20)
ans =
virtue
When assigning a cell you can use the curly brackets on either the left or
right hand side of the equals sign, but you must put them
somewhere
,to
tell matlab that you want this to be a cell. Otherwise, matlab thinks
you are defining a mathematical matrix and gives you an error to the
effect that the things on each side of the equal sign have different sizes.
For example, we can type:
