Note: This page has been translated by MathWorks. Please click here

To view all translated materals including this page, select Japan from the country navigator on the bottom of this page.

To view all translated materals including this page, select Japan from the country navigator on the bottom of this page.

Differences and Approximate Derivatives

calculates
differences between adjacent elements of `Y`

= diff(`X`

)`X`

along
the first array dimension whose size does not equal 1:

If

`X`

is a vector of length`m`

, then`Y = diff(X)`

returns a vector of length`m-1`

. The elements of`Y`

are the differences between adjacent elements of`X`

.Y = [X(2)-X(1) X(3)-X(2) ... X(m)-X(m-1)]

If

`X`

is a nonempty, nonvector p-by-m matrix, then`Y = diff(X)`

returns a matrix of size (p-1)-by-m, whose elements are the differences between the rows of`X`

.Y = [X(2,:)-X(1,:); X(3,:)-X(2,:); ... X(p,:)-X(p-1,:)]

If

`X`

is a 0-by-0 empty matrix, then`Y = diff(X)`

returns a 0-by-0 empty matrix.

Was this topic helpful?