diff --git a/mathgenerator/mathgen.py b/mathgenerator/mathgen.py index 226d8a9..42d166b 100644 --- a/mathgenerator/mathgen.py +++ b/mathgenerator/mathgen.py @@ -280,10 +280,55 @@ def thirdAngleOfTriangleFunc(maxAngle=89): angle1 = random.randint(1, maxAngle) angle2 = random.randint(1, maxAngle) angle3 = 180 - (angle1 + angle2) - problem = "Third angle of triangle = " + problem = f"Third angle of triangle with angles {angle1} and {angle2} = " solution = angle3 return problem, solution +def systemOfEquationsFunc(range_x = 10, range_y = 10, coeff_mult_range=10): + # Generate solution point first + x = random.randint(-range_x, range_x) + y = random.randint(-range_y, range_y) + # Start from reduced echelon form (coeffs 1) + c1 = [1, 0, x] + c2 = [0, 1, y] + + def randNonZero(): + return random.choice([i for i in range(-coeff_mult_range, coeff_mult_range) + if i != 0]) + # Add random (non-zero) multiple of equations (rows) to each other + c1_mult = randNonZero() + c2_mult = randNonZero() + new_c1 = [c1[i] + c1_mult * c2[i] for i in range(len(c1))] + new_c2 = [c2[i] + c2_mult * c1[i] for i in range(len(c2))] + + # For extra randomness, now add random (non-zero) multiples of original rows + # to themselves + c1_mult = randNonZero() + c2_mult = randNonZero() + new_c1 = [new_c1[i] + c1_mult * c1[i] for i in range(len(c1))] + new_c2 = [new_c2[i] + c2_mult * c2[i] for i in range(len(c2))] + + def coeffToFuncString(coeffs): + # lots of edge cases for perfect formatting! + x_sign = '-' if coeffs[0] < 0 else '' + # No redundant 1s + x_coeff = str(abs(coeffs[0])) if abs(coeffs[0]) != 1 else '' + # If x coeff is 0, dont include x + x_str = f'{x_sign}{x_coeff}x' if coeffs[0] != 0 else '' + # if x isn't included and y is positive, dont include operator + op = ' - ' if coeffs[1] < 0 else (' + ' if x_str != '' else '') + # No redundant 1s + y_coeff = abs(coeffs[1]) if abs(coeffs[1]) != 1 else '' + # Don't include if 0, unless x is also 0 (probably never happens) + y_str = f'{y_coeff}y' if coeffs[1] != 0 else ('' if x_str != '' else '0') + return f'{x_str}{op}{y_str} = {coeffs[2]}' + + problem = f"{coeffToFuncString(new_c1)}, {coeffToFuncString(new_c2)}" + solution = f"x = {x}, y = {y}" + return problem, solution + + # Add random (non-zero) multiple of equations to each other + # || Class Instances #Format is: @@ -311,3 +356,5 @@ doesTriangleExist = Generator("Triangle exists check", 19, "Does triangle with s midPointOfTwoPoint=Generator("Midpoint of the two point", 20,"((X1,Y1),(X2,Y2))=","((X1+X2)/2,(Y1+Y2)/2)",MidPointOfTwoPointFunc) factoring = Generator("Subtraction", 21, "x^2+(x1+x2)+x1*x2", "(x-x1)(x-x2)", factoringFunc) thirdAngleOfTriangle = Generator("Third Angle of Triangle", 22, "Third Angle of the triangle = ", "angle3", thirdAngleOfTriangleFunc) +systemOfEquations = Generator("Solve a System of Equations in R^2", 23, "2x + 5y = 13, -3x - 3y = -6", "x = -1, y = 3", + systemOfEquationsFunc)