public DoublePlus div(double constant) {
DoublePlus dp = new DoublePlus();
dp.value = value / constant;
dp.variance = Errors.var_aA(1 / constant, Math.sqrt(variance));
return dp;
}
/**
* Calculate the value and standard deviation of this variable divided by an input argument and
* calculate the resulting standard deviation, given the standard deviation of the input
* multiplier.
*
* @param x The number to divide this value by.
* @param x_SD The standard deviation of the argument value.
* @return The DoublePlus representing result +/- error
*/
public DoublePlus div(double x, double x_SD) {
DoublePlus dp = new DoublePlus();
dp.value = value / x;
dp.variance = Errors.var_AB(value, Math.sqrt(variance), x, x_SD, dp.value);
return dp;
}
public DoublePlus div(DoublePlus dp) {
return div(dp.value(), dp.SD());
}
public static DoublePlus sqrt(DoublePlus dp) {
DoublePlus dplus = new DoublePlus();
dplus.value = Math.sqrt(dp.value);
dplus.variance = Errors.var_sqrt_A(dp.value, dp.SD());
return dplus;
}
public DoublePlus times(DoublePlus dp) {
return times(dp.value(), dp.SD());
}
public static DoublePlus exp(DoublePlus dp) {
DoublePlus dplus = new DoublePlus();
dplus.value = Math.exp(dp.value);
dplus.variance = Errors.exp_A(dp.value, dp.SD());
return dplus;
}
public static DoublePlus ln(DoublePlus dp) {
DoublePlus dplus = new DoublePlus();
dplus.value = Math.log(dp.value);
dplus.variance = Errors.ln_A(dp.value, dp.SD());
return dplus;
}
public DoublePlus minus(DoublePlus dp) {
return minus(dp.value(), dp.SD());
}
/**
* Calculate the value and standard deviation of this an input argument subtracted from this value
* and calculate the resulting standard deviation, given the standard deviation of the input
* value.
*
* @param x The number to subtract from this value.
* @param x_SD The standard deviation of the argument value.
* @return The DoublePlus representing result +/- error
*/
public DoublePlus minus(double x, double x_SD) {
DoublePlus dp = new DoublePlus();
dp.value = value - x;
dp.variance = Errors.var_A_plusMinus_B(Math.sqrt(variance), x_SD);
return dp;
}
public DoublePlus plus(DoublePlus dp) {
return plus(dp.value(), dp.SD());
}
