idcost {PEIP}

Inverse cosine transform

Description

Takes the column-by-column inverse discrete cosine transform of Y.

Usage

idcost(Y)

Arguments

Y

Input cosine transform

Value

Time series

Author(s)

Jonathan M. Lees<[e-mail]>

References

Aster, R.C., C.H. Thurber, and B. Borchers, Parameter Estimation and Inverse Problems, Elsevier Academic Press, Amsterdam, 2005.

See Also

dcost

Examples

x <- 1:4

### compare fft with cosine transform
     fft(x)
    
zig = dcost(x)
zag = idcost(zig)