Badly aligned code is buggy and hides bugs. Your code is badly aligned, is buggy, and hides those bugs.
Solution: align your code correctly (hint: select all code, press ctrl+i). When you align your code consistently many superflous ENDs are very obvious simply by looking (I count four of them):
function SolveButtonPushed(app, event)
% Get the function, interval endpoints, and tolerance from the input fields
func = str2func(['@(x)' app.FunctionEditField.Value]);
a = app.LeftEndpointEditField.Value;
b = app.RightEndpointEditField.Value;
tol = app.ToleranceEditField.Value;
% Perform the bisection method
[root, iter] = bisectionMethod(func, a, b, tol, 1000);
% Display the result in the text area
app.ResultTextArea.Value = sprintf('Root: %f\nIterations: %d', root, iter);
end
end
% App creation and deletion
methods (Access = public)
% Construct the app
function app = BisectionMethodApp
% Create and configure components
app.UIFigure = uifigure;
app.FunctionLabel = uilabel(app.UIFigure, 'Text', 'Enter the function:');
app.FunctionEditField = uieditfield(app.UIFigure, 'Text', '', 'Position', [10, 100, 100, 22]);
app.LeftEndpointLabel = uilabel(app.UIFigure, 'Text', 'Left Endpoint:');
app.LeftEndpointEditField = uieditfield(app.UIFigure, 'numeric', 'Position', [10, 70, 100, 22]);
app.RightEndpointLabel = uilabel(app.UIFigure, 'Text', 'Right Endpoint:');
app.RightEndpointEditField = uieditfield(app.UIFigure, 'numeric', 'Position', [10, 40, 100, 22]);
app.ToleranceLabel = uilabel(app.UIFigure, 'Text', 'Tolerance:');
app.ToleranceEditField = uieditfield(app.UIFigure, 'numeric', 'Position', [10, 10, 100, 22]);
app.SolveButton = uibutton(app.UIFigure, 'Text', 'Solve', 'Position', [10, 10, 100, 22], 'ButtonPushedFcn', @app.solveButtonPushed);
app.ResultTextArea = uitextarea(app.UIFigure, 'Position', [10, 10, 100, 22]);
app.UIFigure.Visible = 'on';
end
end
end
function [root, iterations] = bisectionMethod(func, a, b, tol, maxIterations)
% Check if the function has different signs at the interval endpoints
if func(a) * func(b) >= 0
error('Function has the same sign at the interval endpoints. Bisection method cannot be applied.');
end
% Initialize variables
iterations = 0;
root = (a + b) / 2;
% Perform the bisection method
while [(b - a) / 2 > tol && iterations < maxIterations]
root = (a + b) / 2;
if func(root) == 0
break;
elseif func(a) * func(root) < 0
b = root;
else
a = root;
end
iterations = iterations + 1;
end
end
