diff - Difference and discrete derivative (original) (raw)

Scilab 5.3.3

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Scilab help >> Elementary Functions > diff

Difference and discrete derivative

Calling Sequence

y=diff(x) y=diff(x [,n [,dim]])

Arguments

x

vector or matrix (real, complex, sparse or polynomial)

n

integer the order of differentiation

dim

integer or character string with values "r","c" and "*"

y

scalar or vector

Description

y=diff(x) compute the difference function y=x(2:$)-x(1:$-1)

diff(x,n,dim) is the n th difference function along dimension dim.

diff(x,n,"*") is equivalent to diff(x(:),n).

Default value for n is 1. Default value fordim is "*".

dim='r' is equivalent to dim=1 and dim='c' is equivalent todim=2.

Examples

v=(1:8)^3; diff(v) diff(v,3)

A=[(1:8)^2 (1:8)^3 (1:8)^4];

diff(A,3,2)

step=0.001 t=0🪜10; y=sin(t); dy=diff(sin(t))/step; norm(dy-cos(t(1:$-1)),%inf)