Houdini VEX hextorgb

function float hexchartodec(string char){
    int dec =find("0123456789abcdef", tolower(char))  ;
    if (dec<0) error("invalid hex character: " + char) ;
    return dec ;
}
function float hextodec(string hex){
    float result = 0;
    foreach(int i; string char; hex) result += hexchartodec(char) * pow(16, i) ;
    return result ;
}

function vector hextorgb(string rgbhex){
    if(len(rgbhex)==3) return set(
            hextodec(rgbhex[0]+rgbhex[0]),
            hextodec(rgbhex[1]+rgbhex[1]),
            hextodec(rgbhex[2]+rgbhex[2])) / 255.0 ;
    else return set(
            hextodec(reverse(rgbhex[0:2])),
            hextodec(reverse(rgbhex[2:4])),
            hextodec(reverse(rgbhex[4:6]))) / 255.0 ;
}

//test
@Cd = hextorgb("f50") ;
@Cd = hextorgb("AF15B0") ;