r2c
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## r2c

r2c — Real to complex format conversion.

## Description

Converts a real-valued input array in real-imaginary interleaved complex format, setting its imaginary parts to 0. The output array will be double the size of the input. This is a utility operation to facilitate complex-value operations on real arrays.

## Syntax

    kout[] r2c kin[]

## Performance

kout[] -- output array containing the complex-valued real-imaginary output. It will be created if it does not exist.

kin[] -- input array containing the real-valued input.

## Examples

Here is an example of the r2c opcode. It uses the file r2c.csd.

Example 859. Example of the r2c opcode.

See the sections Real-time Audio and Command Line Flags for more information on using command line flags.

    <CsoundSynthesizer>
    <CsOptions>
    -d -o dac
    </CsOptions>
    <CsInstruments>
    ksmps = 64

    instr 1
    ifftsize = 1024
    kcnt init 0
    kIn[] init  ifftsize
    kOut[] init ifftsize

    a1 oscili 0dbfs/2, 440

    if kcnt >= ifftsize then
     kCmplx[] r2c kIn
     kSpec[] fft kCmplx
     kCmplx fftinv kSpec
     kOut c2r kCmplx
     kcnt = 0
    endif

    kIn[] shiftin a1
    a2 shiftout kOut
    kcnt += ksmps
       out a2
    endin
    </CsInstruments>
    <CsScore>
    i1 0 10
    </CsScore>
    </CsoundSynthesizer>

## See Also

Vectorial opcodes, array opcodes

## Credits

Author: Victor Lazzarini
NUI Maynooth
2014

New in version 6.04

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