Curve Joystick Moving Slow when moving backwards

Programming Support VEXcode V5 Tech Support
#1

int curveJoystick(bool red,int input, double t){
int val=0;
if (red){
val=(std::exp(-t/10)+std::exp((std::exp(input)-100/10))*(1-std::exp(-t/10))) * input;
}
else{
val = std::exp(((std::abs(input)-100)*t)/1000) *input;
}
return val;
}
LF.spin(directionType::fwd, curveJoystick(1,J3,8), velocityUnits::pct);
LR.spin(directionType::fwd, curveJoystick(1,J3,8), velocityUnits::pct);
RF.spin(directionType::fwd, curveJoystick(1,J2,8), velocityUnits::pct);
RR.spin(directionType::fwd,curveJoystick(1,J2,8) , velocityUnits::pct);

It works when moving forward, however, when moving backwards the robot slows down in speed.

#2

In the future, can you format your code?

[Code]
This would be Formated code.
[/Code]
#3

Also, what are you trying to do with this code? Curve the joystick to give more control at lower speed?

#4

Give more control for turning but when the joysticks are negative the drivetrain moves slowly