function RSIDot($stocknum, $var, $period)
{
$close = getclose($stocknum, $period);
$close[0] = 0;
$rsiup = 0;
$rsidn = 0;
for ($i = 1; $i < count($close); $i++) {
$t = $close[$i] - $close[$i - 1];
if ($t > 0) {
$rsiup = $t * (1 / $var) + $rsiup * ($var - 1) / $var;
$rsidn = 0 * (1 / $var) + $rsidn * ($var - 1) / $var;
} else {
$rsiup = 0 * (1 / $var) + $rsiup * ($var - 1) / $var;
$rsidn = $t * -1 * (1 / $var) + $rsidn * ($var - 1) / $var;
}
if ($rsidn == 0) {
$rs = 0;
} else {
$rs = $rsiup / $rsidn;
}
$close[$i - 1] = 100 - 100 / (1 + $rs);
}
unset($close[count($close) - 1]);
return $close;
}
function testRSI($stocknum, $var1, $var2, $period)
{
//var1
$close = getclose($stocknum, $period);
$close[0] = 0;
$rsiup = 0;
$rsidn = 0;
for ($i = 1; $i < count($close); $i++) {
$t = $close[$i] - $close[$i - 1];
if ($t > 0) {
$rsiup = $t * (1 / $var1) + $rsiup * ($var1 - 1) / $var1;
$rsidn = 0 * (1 / $var1) + $rsidn * ($var1 - 1) / $var1;
} else {
$rsiup = 0 * (1 / $var1) + $rsiup * ($var1 - 1) / $var1;
$rsidn = $t * -1 * (1 / $var1) + $rsidn * ($var1 - 1) / $var1;
}
if ($rsidn == 0) {
$rs = 0;
} else {
$rs = $rsiup / $rsidn;
}
$rsi1 = 100 - 100 / (1 + $rs);
}
//var2
$close = getclose($stocknum, $period);
$close[0] = 0;
$rsiup = 0;
$rsidn = 0;
for ($i = 1; $i < count($close); $i++) {
$t = $close[$i] - $close[$i - 1];
if ($t > 0) {
$rsiup = $t * (1 / $var2) + $rsiup * ($var2 - 1) / $var2;
$rsidn = 0 * (1 / $var2) + $rsidn * ($var2 - 1) / $var2;
} else {
$rsiup = 0 * (1 / $var2) + $rsiup * ($var2 - 1) / $var2;
$rsidn = $t * -1 * (1 / $var2) + $rsidn * ($var2 - 1) / $var2;
}
if ($rsidn == 0) {
$rs = 0;
} else {
$rs = $rsiup / $rsidn;
}
$rsi2 = 100 - 100 / (1 + $rs);
}
//判斷
if ($rsi1 > $rsi2) {
return 1;
} else {
if ($rsi1 < $rsi2) {
return -1;
} else {
return 0;
}
}
}
