commit 4210f632d7fdaed4e19c95e4d7c20403066f48d1
Author: Lukasz M <ttecluk@gmail.com>
Date:   Thu Mar 24 18:41:44 2022 +0100

    initial version of linalg-practice program with mult feature

diff --git a/linalg-practice.py b/linalg-practice.py
new file mode 100644
index 0000000..9066aca
--- /dev/null
+++ b/linalg-practice.py
@@ -0,0 +1,71 @@
+import sympy as sp
+import time
+import random
+
+# in function to take arbitrary matrix input from user
+def inmat(rowcol) :
+    # initialise list of lists
+    mat=[[]]*rowcol
+    # take input from user into list
+    print("Enter line by line with entries separated by space:")
+    for i in range(rowcol):
+        mat[i]=input().split(" ")
+        for j in range(len(mat[i])) :
+            # convert list using nsimplify in order to take rational number symbolically
+            mat[i][j] = sp.nsimplify(mat[i][j])
+    return mat
+
+# multcheck function to check if two matrices are multiplied together
+def multcheck(a, b, rowcol, intmax) :
+    sp.pprint(b)
+    print("Multiply these two matrices together")
+    # return bool based on if input equals the two matrices multiplied together
+    return (sp.Matrix(inmat(rowcol)) == a*b)
+
+# practice function
+def practice(t) :
+    count = 0
+    rowcol = int(input("What size of matrix do you want to practice with? "))
+    intmax = int(input("What maximum size of integer do you want the matrix to be made out of? "))
+    dif = float(input("What difficulty (probability for a matrix of rational values between 0, 1) do you want? "))
+
+    # choose the function of the program that you want
+    if t == "mult" :
+        f = multcheck
+    else :
+        exit()
+
+    # initialise time measurement
+    tic = time.perf_counter()
+
+    # infinite loop of practice
+    while True :
+        # generate a random matrices
+        a = sp.randMatrix(rowcol, rowcol, 0, intmax)
+        b = sp.randMatrix(rowcol, rowcol, 0, intmax)
+
+        # if determinant non-zero, radnom value less than difficulty, set a to its inverse
+        if a.det() != 0 and random.random() <= dif :
+            a = a.inv()
+
+        # infinite loop until user succeeds 
+        while True :
+            sp.pprint(a)
+            # if return of function is True
+            if f(a, b, rowcol, intmax) :
+                # take time interval
+                toc = time.perf_counter()
+                tictoc=toc-tic
+                # increment count
+                count += 1
+                # print success message
+                print("Correct! You have solved", count, "problems in %.2f seconds" %tictoc)
+                break
+            else :
+                # print failure message
+                print("Try again")
+                continue
+
+# take input from user on the type of practice they want to do
+t = input("What do you want to practice? (mult, det, inv, eig) ")
+practice(t)