# alm2pix

Evaluate function, expressed as spherical harmonic expansion coefficients, on HEALPix pixel centers

## Contents

- Syntax
- Input Arguments
- Return Arguments
- Example
- See also
- Requires

## Syntax

    v = alm2pix( nSide, alm, 'Param1', Value1, 'Param2', Value2, ...)

## Input Arguments

nSide HEALPix resolution parameter (power of 2) alm Spherical harmonic expansion coefficients

Param Value 'lmax' max order of harmonic to calculate (default floor2*nSide/3) 'nest' (true | {false})

## Return Arguments

    v       Function values at pixels in either ring or nest indexing

## Example

Shows the gibbs-like error at the poles

    nSide = 2^4;
    alm = pix2alm(ones(1,12*nSide^2));
    v = alm2pix(nSide,alm);
    hp3d(v-1);

## See also

pix2alm

## Requires

ylm

Copyright 2010-2011 Lee Samuel Finn. Terms of Use.