I want to set the `subCurveExtrMax` attribute to a random number between `x` and `y` but I am having trouble selecting the attribute:

```
string $sel[] = `ls -sl`;
string $obj;

for ($obj in $sel) {
    float $ran = rand(0.972, 0.984);
    setAttr ($obj+".polyExtrudeFace.subCurveExtrMax") $ran;
}

```