MATLAB Programming

3 Basic Program Components
X = -pi:pi/10:pi;
Y = tan(sin(X)) - sin(tan(X));
C{1,1} = 'LineWidth'; C{2,1} = 2;
C{1,2} = 'MarkerEdgeColor'; C{2,2} = 'k';
C{1,3} = 'MarkerFaceColor'; C{2,3} = 'g';
plot(X, Y, '--rs', C{:})
Function Return Values
MATLAB functions can also return more than one value to the caller. These
values are returned in a list with each value separated by a comma. Instead
of listing each return value, you can use a comma-separated list with a
structure or cell array. This becomes more useful for those functions that have
variable numbers of return values.
This example returns four values to a cell array:
C = cell(1, 4);
[C{:}] = fileparts('work/mytests/strArrays.mat')
C =
'work/mytests' 'strArrays' '.mat' ''
Fast Fourier Transform Example
The fftshift function swaps the left and right halves of each dimension
of an array. For a simple vector such as [0 2 4 6 8 10] the output would
be [6 8 10 0 2 4]. For a multidimensional array, fftshift performs this
swap along each dimension.
fftshift uses vectors of indices to perform the swap. For the vector shown
above, the index [1 2 3 4 5 6] is rearranged to form a new index [4 5 6 1
2 3]. The function then uses this index vector to reposition the elements. For
a multidimensional array, fftshift must construct an index vector for each
dimension. A comma-separated listmakesthistaskmuchsimpler.
Here is the fftshift function:
function y = fftshift(x)
3-86