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Always round values <= 10^-16 down to zero

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bakk 2021-05-23 01:30:10 +02:00
parent 0bbf1c4974
commit 7fd6d28e1d
1 changed files with 18 additions and 7 deletions
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25
kalk/src/kalk_num/mod.rs
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@ -187,8 +187,12 @@ impl KalkNum {
pub fn to_string_pretty(&self) -> String {
let sci_notation_real = self.to_scientific_notation(ComplexNumberType::Real);
let mut adjusted_num = self.clone();
let result_str = if (-6..8).contains(&sci_notation_real.exponent) || self.value == 0f64 {
self.to_string_real()
} else if sci_notation_real.exponent <= -15 {
adjusted_num.value = KalkNum::from(1f64).value;
String::from("0")
} else {
sci_notation_real.to_string().trim().to_string()
};
@ -199,12 +203,15 @@ impl KalkNum {
|| self.imaginary_value == 1f64
{
self.to_string_imaginary(true)
} else if sci_notation_real.exponent <= -15 {
adjusted_num.imaginary_value = KalkNum::from(1f64).value;
String::from("0")
} else {
format!("{}", sci_notation_imaginary.to_string().trim())
};
let mut output = result_str;
if self.has_imaginary() {
if adjusted_num.has_imaginary() {
// If the real value is 0, and there is an imaginary one,
// clear the output so that the real value is not shown.
if output == "0" {
@ -227,12 +234,12 @@ impl KalkNum {
}
}
let unit = self.get_unit();
let unit = adjusted_num.get_unit();
if unit != "" {
output.push_str(&format!(" {}", unit));
}
if let Some(estimate) = self.estimate() {
if let Some(estimate) = adjusted_num.estimate() {
output.push_str(&format!(" ≈ {}", estimate));
}
@ -475,10 +482,14 @@ impl KalkNum {
// If the value squared (and rounded) is an integer,
// eg. x² is an integer,
// then it can be expressed as sqrt(x²)
let squared = KalkNum::new(value.clone() * value, "").round_if_needed();
if squared.value.clone().fract() == 0f64 {
return Some(format!("√{}", squared.to_string()));
// then it can be expressed as sqrt(x²).
// Ignore it if the square root of the result is an integer.
if fract != 0f64 {
let squared = KalkNum::new(value.clone() * value, "").round_if_needed();
if squared.value.clone().sqrt().fract() != 0f64 && squared.value.clone().fract() == 0f64
{
return Some(format!("√{}", squared.to_string()));
}
}
// If nothing above was relevant, simply round it off a bit, eg. from 0.99999 to 1