MATLAB Programming

Resizing and Reshaping Matrices
Adding Smaller Blocks to a Matrix
To add one or more elements to a matrix where the sizes are not compatible,
you can often just store the new elements outside the boundaries of the
original matrix. MATLAB automatically pads the matrix with zeros to keep it
rectangular.
Constructa3-by-5matrix,andattempttoaddanewelementtoitusing
concatenation. The operation fails because you are attempting to join a
one-column matrix with one that has five columns:
A = [ 10 20 30 40 50; ...
60 70 80 90 100; ...
110 120 130 140 150];
A = [A; 160]
??? Error using ==> vertcat
All rows in the bracketed expression must have the same
number of columns.
Try this again, but this time do it in such a way that enables MATLAB to
make adjustments to the size of the matrix. Store the new element in row 4, a
row that does not yet exist in this matrix. MATLAB expands matrix A by an
entire new row by padding columns 2 through 5 with zeros:
A(4,1) = 160
A =
10 20 30 40 50
60 70 80 90 100
110 120 130 140 150
160 0 0 0 0
Note Attempting to read from nonexistent matrix locations generates an
error. You can only write to these locations.
You can also expand the matrix by adding a matrix instead of just a single
element:
A(4:6,1:3) = magic(3)+100
1-29