Add or remove compartments from models (#102)

* Add `.add` and `.remove`  to `Model` class in `model` module

Adds `.add` and `.remove` functions to the Model class in the model module, which add and remove compartments.

CHANGELIST:
  * Add `.add` and `.remove` functions to model class
  * Version bump
  * Update changelog

Signed-off-by: @Quantalabs <npm.quantalabs@gmail.com>

* Update docs

* Build code for web support

Rebuild web code with browserify and terser

* Add testing

* Bug Fix

CHANGELOG.md

@@ -1,3 +1,15 @@
+# v2.2.0
+
+- Add `.remove` and `.add` functions to `Model` class in `model` module to add and remove compartments.
+
+# v2.1.2
+
+- Fix error from previous release
+
+# v2.1.1
+
+- Fix key error in `model`
+
 # v2.1.0
 - Adds `manipulate` to manipulate outputs with `plots`
 - Adds `mexport` and `mimport` to `model`, which allow for exporting and importing models to `.js` and `.json` files.   

EpiJS/model.js

@@ -87,6 +87,64 @@ class Model {
 			}
 		}
 	}
+
+	/**
+	 * Remove a compartment from the model.
+	 * @param {Object} compartment - The compartment to remove.
+	 * @example
+	 * 
+	 * 	let susceptible = new Idiom("S-(B*S*I/p)");
+	 * let infected = new Idiom("I+(B*S*I/p)-(u*I)");
+	 * let recovered = new Idiom("R+(u*I)");
+	 * 
+	 * let key = {
+	 * 	"S": 10000,
+	 * 	"B": 0.3,
+	 * 	"I": 100,
+	 * 	"R": 0,
+	 * 	"p": 10100,
+	 * 	"u": 0.2
+	 * };
+	 * 
+	 * let sirm = new Model([[susceptible, "S"], [infected, "I"], [recovered, "R"]], key)
+	 * 
+	 * sirm.remove(recovered) // Removes the recovered compartment.
+	 */
+	remove(compartment) {
+		for (var x = 0; x < this.compartments.length; x++) {
+			if (this.compartments[x][0] === compartment) {
+				this.compartments.splice(x, 1)
+			}
+		}
+	}
+
+	/**
+	 * Add a compartment to the model.
+	 * @param {Array} compartment - The compartment to add, should be a list, with the first value being the compartment, and the second being it's value in the key.
+	 * @param {Number} index - The index to add the compartment at.
+	 * @example
+	 * 
+	 * 	let susceptible = new Idiom("S-(B*S*I/p)");
+	 * let infected = new Idiom("I+(B*S*I/p)-(u*I)");
+	 * let recovered = new Idiom("R+(u*I)");
+	 * 	
+	 * let key = {
+	 * 	"S": 10000,
+	 * 	"B": 0.3,
+	 * 	"I": 100,
+	 * 	"R": 0,
+	 * 	"p": 10100,
+	 * 	"u": 0.2
+	 * };
+	 * 
+	 * let sirm = new Model([[susceptible, "S"], [infected, "I"], [recovered, "R"]], key)
+	 * 
+	 * sirm.remove(susceptible) // Removes the susceptible compartment.
+	 * sirm.add([susceptible, "S"], 0) // Adds the susceptible compartment back to the beginning
+	 */
+	add(compartment, index) {
+		this.compartments.splice(index, 0, compartment)
+	}
 }
 
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