help diff
DIFF Difference and approximate derivative.
DIFF(X), for a vector X, is [X(2)-X(1) X(3)-X(2) ... X(n)-X(n-1)].
DIFF(X), for a matrix X, is the matrix of row differences,
[X(2:n,:) - X(1:n-1,:)].
DIFF(X), for an N-D array X, is the difference along the first
non-singleton dimension of X.
DIFF(X,N) is the N-th order difference along the first non-singleton
dimension (denote it by DIM). If N >= size(X,DIM), DIFF takes
successive differences along the next non-singleton dimension.
DIFF(X,N,DIM) is the Nth difference function along dimension DIM.
If N >= size(X,DIM), DIFF returns an empty array.
Examples:
h = .001; x = 0:h:pi;
diff(sin(x.^2))/h is an approximation to 2*cos(x.^2).*x
diff((1:10).^2) is 3:2:19
If X = [3 7 5
0 9 2]
then diff(X,1,1) is [-3 2 -3], diff(X,1,2) is [4 -2
9 -7],
diff(X,2,2) is the 2nd order difference along the dimension 2, and
diff(X,3,2) is the empty matrix.
See also GRADIENT, SUM, PROD.
Documentation for diff
doc diff
Other uses of diff
codistributed/diff iddata/diff tall/diff
datetime/diff sym/diff tireModel/diff
duration/diff symbolic/diff umat/diff
gpuArray/diff tabular/diff
