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dst, idst

Discrete sine transform

Syntax

y=dst(x)
y=dst(x,n)
x=idst(y)
x=idst(y,n)

Description

The dst function implements the following equation:

y=dst(x) computes the discrete sine transform of the columns of x. For best performance speed, the number of rows in x should be 2m – 1, for some integer m.

y=dst(x,n) pads or truncates the vector x to length n before transforming.

If x is a matrix, the dst operation is applied to each column.

The idst function implements the following equation:

x=idst(y) calculates the inverse discrete sine transform of the columns of y. For best performance speed, the number of rows in y should be 2m – 1, for some integer m.

x=idst(y,n) pads or truncates the vector y to length n before transforming.

If y is a matrix, the idst operation is applied to each column.

For more information about this algorithm, see Solve Poisson's Equation on a Grid.

See Also

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