My name: Jennifer Green
My original plan was to use the library "mode-lambda: the best 2D graphics of the 90s, today!" mostly because of the name (and also the documentary was written by Professor McCarthy). However, I decided that it was too close to the racket/draw library, and so went with the math library instead. I chose this library because being able to solve complex math problems without having to write the underlying structures yourself is incredibly useful. I decided to screw around with matrixes and stats a little bit. I would have liked to do more with statistics, I feel like what I have is so simple.
I'm not sure why this image comes out sideways here. It displays properly on my screen. Regardless, here is my code.
Because my code is so short, here it is in its entirety.
(require math)
Since I am using functions from two different sub-libraries of math, I chose to include the entire library rather than listing them individually.
(define (one-matrix x)
(make-matrix x x 1) )
Creates an x by x matrix entirely composed of 1's.
(define (my-matrix)
(one-matrix 5) )
Creates a 5x5 matrix of 1's using the one-matrix code.
(define (add-identity x)
(matrix+ x (identity-matrix 5)) )
Adds a 5x5 identity matrix to another matrix, x. In hindsight, this would be better if I used the length of the array x to set the size for the identity matrix. That way it would work with more than 5x5 matrices.
(define (scale-my-matrix x)
(matrix-scale (my-matrix) x) )
Scales my-matrix by x.
(define (find-mean lst)
(mean lst) )
(define (find-stddev lst)
(stddev lst) )
These will let you find the mean and standard deviation of a list.