Fix Mermaid parse errors in block diagram labels

AERO3220_HW4_block_diagram.md

@@ -5,7 +5,7 @@ flowchart TD
     A([Start Script]) --> B[Clear Workspace: clear, close all, clc]
     B --> C[Set Parameters: k1, k2, m1, m2]
     C --> D[Set Time Grid: t0, tf, dt, tspan]
-    D --> E[Set Initial State: x0 = [z1 z1dot z2 z2dot]^T]
+    D --> E[Set Initial State: x0 = (z1, z1dot, z2, z2dot)^T]
     E --> F[Define Input Force Functions: F1, F2, F3]
 
     F --> G[Case 1: b=100, F=F1]
@@ -34,7 +34,7 @@ flowchart TD
     W --> X[Unpack States: z1, z1dot, z2, z2dot]
     X --> Y[Evaluate Input: u = Ffun(t)]
     Y --> Z[Compute Accelerations: z1ddot and z2ddot]
-    Z --> AA[Return State Derivative: dx = [z1dot z1ddot z2dot z2ddot]^T]
+    Z --> AA[Return State Derivative: dx = (z1dot, z1ddot, z2dot, z2ddot)^T]
     AA --> AB([End])
 ```
 
@@ -56,7 +56,7 @@ where \(u(t)\) is one of the three forcing functions depending on the case.
 flowchart TD
     A([Start]) --> B[Define constants and masses: k1, k2, m1, m2]
     B --> C[Define simulation time: t0, tf, dt, tspan]
-    C --> D[Set initial state vector: x0 = [z1 z1dot z2 z2dot]^T]
+    C --> D[Set initial state vector: x0 = (z1, z1dot, z2, z2dot)^T]
     D --> E[Define force inputs: F1=100, F2=100sin(0.25t), F3=100sin(0.50t)]
 
     E --> F[Create case table: (Case, b, Force)]
@@ -85,6 +85,6 @@ flowchart LR
     A2 --> A3[Compute input force: u = Ffun(t)]
     A3 --> A4[Compute z1ddot from mass 1 equation]
     A4 --> A5[Compute z2ddot from mass 2 equation]
-    A5 --> A6[Assemble derivative: dx = [z1dot z1ddot z2dot z2ddot]^T]
+    A5 --> A6[Assemble derivative: dx = (z1dot, z1ddot, z2dot, z2ddot)^T]
     A6 --> A7[Return dx to ode45]
 ```