Add methods for adding/subtracting vectors #1205
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Add a method `add_assign_vector` that replaces the following zip
pattern:
```
for (x, y) in a.iter_mut().zip(y) {
*x += *y;
}
```
The method also panics if `b` is shorter than `a`.
Replace the zip pattern with this method wherever we add up vectors.
This helps us ensure that we're not accidentally adding a vector that's
shorter than the other.
Likewise for subtracting vectors.
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Closes #301: see #301 (comment).
Add a method
add_assign_vectorthat replaces the following zip pattern:The method also panics if
bis shorter thana.Replace the zip pattern with this method wherever we add up vectors. This helps us ensure that we're not accidentally adding a vector that's shorter than the other.
Likewise for subtracting vectors.