some improvements

src/misc.rs

@@ -234,6 +234,14 @@ pub fn resolution_helper(max_i: usize, min_x: f64, resolution: f64) -> Vec<f64>
 		.collect()
 }
 
+// Returns a vector of length `max_i` starting at value `min_x` with step of
+// `step`
+pub fn step_helper(max_i: usize, min_x: f64, step: f64) -> Vec<f64> {
+	(0..max_i)
+		.map(|x| (x as f64 * step as f64) + min_x)
+		.collect()
+}
+
 #[cfg(test)]
 mod tests {
 	use super::*;