"For" loop problem

I trying to make something like this loop, I removed many parts, but I left that is not working as I expected. And what I expected is that Monitor and Monitor3 will show value of slider with number corresponding to loop iteration number(i), but it shows only 0. How do I make it working properly?

decl i, size=sizeof(MultiSlider.x);
for (i=1;i<size;i++);
{
p3 = MultiSlider.x;
q3 = MultiSlider.x[0];
if (i=1);
{
Monitor.value = p3;
Monitor2.value = q3;
}
if (i=2);
{
Monitor3.value = p3;
Monitor4.value = q3;
}
}

loop.jzml

BTW it works if you reduce p3 and q3, but I can't do without them.

A few minor issues . .
Placement of ';' . . .
'=' is assignment '==' is comparison

decl i, size=sizeof(MultiSlider.x);
for (i=1;i<size;i++)
{
p3 = MultiSlider.x;
q3 = MultiSlider.x[0];

if (i==1)
{
Monitor.value = p3;

Monitor2.value = q3;

}

if (i==2)

{

Monitor3.value = p3;

Monitor4.value = q3;

}
}


And it could all be achieved with a loop anyway just straight assigns - not sure why you have chosen the looping . . .

I corrected mistakes you pointed but Monitors values still not moving.

And it could all be achieved with just straight assigns

Full script contains large formula, without loop it will be repeated many times, and there is a limit of maximum strings in one script, and I'm not sure how to factor this formula out.

loop_corrected.jzml