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Linear algebra

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diff

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Differences and approximate derivatives.

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Syntax

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Y = diff(X)

Y = diff(X, n)

Y = diff(X, n, dim)

Input argument

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X

vector or matrix (real or single)

n

difference order: positive integer scalar or []

dim

dimension: positive integer scalar

Output argument

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Y

difference array: vector or matrix.

Description

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If X is a vector of length n, result of diff(X) is a vector of first differences X(2) - X(1), ..., X(n) - X(n-1).

If X is a matrix, result of diff(X) is a matrix of column differences along the first non-singleton dimension.

Example

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h = .01; x = 0:h:pi;
X = sin(x.^2);
R = diff(X)

See also

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sum, prod.

History

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Version	Description
1.0.0	initial version

Author

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Allan CORNET