Variables comparison

Projects Programming
1

Good evening everyone,
I have to control motors according to a x,y position of an object which is relevated by a camera then the camera sends to my arduino programm the x,y variables.
As these two variables change every cycle and I need to compare them in order to know if I have to move the motor forward or backward, how can I memorize the values of x,y in cycle 1 and then compare it with the new values x,y in cycle 2?
Should I memorize them in the EEPROM at every cycle and then compare them?

Thank you for your help in advance

2

Before you take the cycle2 readings, just save the previous ones into two more variables

xOld =x;
yOld=y;
//then get the new x and y how ever that happens
//and compare:
if (x>xOld)
{
//whatever
}
else
{
//whatever
}
//same for y
3

manor_royal:
Before you take the cycle2 readings, just save the previous ones into two more variables

twice the global variables?

some pseudo code...

int newX = getSomeValueForX();
int newY = getSomeValueForY();

if(oldX isDifferentFrom newX)
{
  //do something
  oldX = newX;
}


if(oldY isDifferentFrom newY)
{
  //do something
  oldY = newY;
}

// do more stuff