Cal Planner v1.0

Features
1. Perpetual calendar
2. View two months at once
3. Memory efficient: it deletes unneeded variables and archives your events.
4. It's Stable. This is a basic program, so it won't freeze your calculator!
5. Fast: 10 seconds to draw two months, and checking for events on each day.
6. Navigationally fast: Instead of moving the cursor around to find a day, the user enters the day to edit the events.

Download
README.txt
calplanner.zip [12k]
event.89p (bugfix)

Other programs

• Matrix inverter: inv.zip An assembly program that computes the inverse of a matrix 7-10 times faster than the TI-89 built in function! For example, a 15x15 random matrix takes only 15 seconds to invert with this program, compared to 2:48 (auto mode) and 1:41 (approx mode) for the built in function.
• Jacobian Matrix: jacoblin.89p returns the Jacobian matrix of partial derivatives. Requires the following to be installed: Matrix inverter, upmat.89f, lowmat.89f, diagmat.89f.

Evalpoly (function)

• Purpose: To evaluate an algebraic expression without changing variable contents.
  
• Syntax: evalpoly(expression,{variable list}, {value list})
  
• Example: evalpoly(x^y+z/sqrt(x),{x,y,z},{1,2,3})
  returns 9
  
• Requires: nothing
• Download evalpoly.89f

Jacobi Iterative Linear Equation solver (program)

• Purpose: Solve a system of linear equations using Newton's equation:
  X^(k+1) = X^(k) - f(X)dX/j(X^k)
  
• Syntax: nonlin({equation list},{variable list},{value list},tolerance)
  equation list: {x^y+x*z^(y-2),x*y*z-e^(x/y)}
  variable list: this is the list of variables that appear in the equation list. Put them in order of appearance
  value list: this is the list of initial values each equation equals
  tolerance: the stopping condition of abs(max(X^(k+1)-X^k))
  
• Requires: jacoblin.89p, matinv.89z.
• Download nonlin.89p