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Fixed code in Octave Post

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Brandon Rozek 2020-10-14 23:53:11 -04:00
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content/blog/2017-03-09-simplifying-expressions-octave.md
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@ -30,30 +30,37 @@ First install [Octave](https://www.gnu.org/software/octave/) and the [symbolic p
Then in octave type in the following code Then in octave type in the following code
```MATLAB
pkg load symbolic pkg load symbolic
```
## Usage ## Usage
For every variable not defined earlier in your expression, make sure to declare it as a symbolic data type For every variable not defined earlier in your expression, make sure to declare it as a symbolic data type
<pre class='language-MATLAB'><code class='language-MATLAB'>syms x y</code></pre> ```MATLAB
syms x y
```
Then make an expression Then make an expression
<pre class='language-MATLAB'><code class='language-MATLAB'> ```MATLAB
expr = y + sin(x)^2 + cos(x)^2 expr = y + sin(x)^2 + cos(x)^2
</code></pre> ```
You can then ask Octave to simplify the expression for you You can then ask Octave to simplify the expression for you
<pre class='language-MATLAB'><code class='language-MATLAB'> ```MATLAB
simp_expr = simplify(expr) simp_expr = simplify(expr)
</code></pre> ```
Displaying it shows it as Displaying it shows it as
<pre class='language-MATLAB'><code class='language-MATLAB'>(sym) y + 1</code></pre> ```MATLAB
(sym) y + 1
```
Which is indeed a simplification using a trig identity 🙂 Which is indeed a simplification using a trig identity 🙂
Update: Octave's symbolic is based on [SymPy](https://www.sympy.org/en/index.html). If you're confortable with Python, I recommend checking it out.