math_utils_lib 0.4.1

A library providing math utilities such as a parser/evaluator and a LaTeX export to export a history of parsed expressions and solved equations to LaTeX.
Documentation 
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use crate::basetypes::Value;

#[doc(hidden)]
pub fn sadd(a: &f64, b: &f64) -> Result<Value, String> {
    Ok(Value::Scalar(a + b))
}

#[doc(hidden)]
pub fn vadd(a: &Vec<f64>, b: &Vec<f64>) -> Result<Value, String> { 
    if a.len() != b.len() {
        return Err(format!("Vectors have different dimensions!"));
    }
    let mut output_v = vec![];
    for i in 0..a.len() {
        output_v.push(a[i]+b[i]);
    }
    return Ok(Value::Vector(output_v));
}

#[doc(hidden)]
pub fn madd(a: &Vec<Vec<f64>>, b: &Vec<Vec<f64>>) -> Result<Value, String> {
    if a.len() != b.len() || a[0].len() != b[0].len() {
        return Err(format!("Matrices have different dimensions!"));
    }
    let mut output_m = vec![];
    for i in 0..a.len() {
        let mut row = vec![];
        for j in 0..a[0].len() {
            row.push(a[i][j] + b[i][j])
        }
        output_m.push(row);
    }
    return Ok(Value::Matrix(output_m));
}

#[doc(hidden)]
pub fn vsub(a: &Vec<f64>, b: &Vec<f64>) -> Result<Value, String> {
    let mut b_neg = vec![];
    for i in 0..b.len() {
        b_neg.push(b[i] * -1.);
    }
    vadd(a, &b_neg)
}

#[doc(hidden)]
pub fn msub(a: &Vec<Vec<f64>>, b: &Vec<Vec<f64>>) -> Result<Value, String> {
    let mut b_neg = vec![];
    for i in 0..b.len() {
        let mut r_neg = vec![];
        for j in 0..b[0].len() {
            r_neg.push(b[i][j] * -1.);
        }
        b_neg.push(r_neg);
    }
    madd(a, &b_neg)
}