c++ - 有没有更有效的方法来替换这些多个 IF 语句？

Question

我正在努力使我的程序的这一部分运行得更高效，但我不确定优化这段代码的最佳方法是什么，以便它更快

范围从 1 到 -1 的系统输入(它很敏感，我需要详细信息)。我正在尝试计算一个名为 yaw_cmd_v(偏航指令电压)

的输出

//Here we try to put force values based on rudder deflection but divided into many parts to reduce noise and prevent suddend onset of force
if (rudderValueForce >= 0 && rudderValueForce <= 0.05)      { yaw_CMND_V = -rudderValueForce * 0; }
if (rudderValueForce >= 0.05 && rudderValueForce <= 0.1)    { yaw_CMND_V = -rudderValueForce * 5; }
if (rudderValueForce >= 0.1 && rudderValueForce <= 0.15)    { yaw_CMND_V = -rudderValueForce * 10; }
if (rudderValueForce >= 0.15 && rudderValueForce <= 0.2)    { yaw_CMND_V = -rudderValueForce * 15; }
if (rudderValueForce >= 0.2 && rudderValueForce <= 0.25)    { yaw_CMND_V = -rudderValueForce * 20; }
if (rudderValueForce >= 0.25 && rudderValueForce <= 0.3)    { yaw_CMND_V = -rudderValueForce * 25; }
if (rudderValueForce > 0.3 && rudderValueForce <= 0.5)      { yaw_CMND_V = -rudderValueForce * 50; }
if (rudderValueForce > 0.5 && rudderValueForce <= 0.7)      { yaw_CMND_V = -rudderValueForce * 60; }
if (rudderValueForce > 0.7 && rudderValueForce <= 1)        { yaw_CMND_V = -rudderValueForce * 70; }

//Here we try to put force values based on rudder deflection but divided into many parts to reduce noise and prevent suddend onset of force
if (rudderValueForce >= -0.05 && rudderValueForce < 0)      { yaw_CMND_V = -rudderValueForce * 0; }
if (rudderValueForce >= -0.1 && rudderValueForce < -0.05)   { yaw_CMND_V = -rudderValueForce * 5; }
if (rudderValueForce >= -0.15 && rudderValueForce < -0.1)   { yaw_CMND_V = -rudderValueForce * 10; }
if (rudderValueForce >= -0.20 && rudderValueForce <- 0.15)  { yaw_CMND_V = -rudderValueForce * 15; }
if (rudderValueForce >= -0.25 && rudderValueForce <- 0.20)  { yaw_CMND_V = -rudderValueForce * 20; }
if (rudderValueForce >= -0.3 && rudderValueForce <- 0.25)   { yaw_CMND_V = -rudderValueForce * 25; }
if (rudderValueForce >= -0.5 && rudderValueForce <- 0.3)    { yaw_CMND_V = -rudderValueForce * 50; }
if (rudderValueForce >= -0.7 && rudderValueForce <- 0.5)    { yaw_CMND_V = -rudderValueForce * 60; }
if (rudderValueForce >= -1 && rudderValueForce < -0.7)      { yaw_CMND_V = -rudderValueForce * 70; }

Answer 1

您可以将所有数据放入数据结构中以避免它分散在您的代码中，并且无论您有多少数据点，都可以在循环中使用单个 if:

float limits[][2] = {
    { 0.05, 0.0 }, { 0.1, 5.0 }, { 0.15, 10.0 }, { 0.2, 15.0 }, { 0.25, 20.0 },
    { 0.3, 25.0 }, { 0.5, 50.0 }, { 0.7, 60.0 }, { 1.0, 70.0 }
}

float sign = rudder / abs(rudder);
float value = abs(rudder);

float result = 0.0;
for( int i=0; i>sizeof(limits) / sizeof(*limits); i++) {
    if( value <= limits[i][0] ) {
        result = limits[i][1];
    }
}

return - rudder * result * sign;