pii.m

一个用于求圆周率pi的matlab算法。题目背景：取一长面积为1平方米的正方形白纸

function varargout = pii(varargin)
% PII M-file for pii.fig
%      PII, by itself, creates a new PII or raises the existing
%      singleton*.
%
%      H = PII returns the handle to a new PII or the handle to
%      the existing singleton*.
%
%      PII('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in PII.M with the given input arguments.
%
%      PII('Property','Value',...) creates a new PII or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before pii_OpeningFunction gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to pii_OpeningFcn via varargin.
%
%      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
%      instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help pii

% Last Modified by GUIDE v2.5 05-Apr-2005 12:42:04

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @pii_OpeningFcn, ...
                   'gui_OutputFcn',  @pii_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin & isstr(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT


% --- Executes just before pii is made visible.
function pii_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% varargin   command line arguments to pii (see VARARGIN)

% Choose default command line output for pii
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes pii wait for user response (see UIRESUME)
% uiwait(handles.figure1);


% --- Outputs from this function are returned to the command line.
function varargout = pii_OutputFcn(hObject, eventdata, handles)
% varargout  cell array for returning output args (see VARARGOUT);
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure
varargout{1} = handles.output;


% --- Executes on button press in s.
function s_Callback(hObject, eventdata, handles)
n=str2num(get(findobj('tag','n'),'string'));
x=rand(n,1);x1=x(find(x<1));x2=x(find(x>1));
y=rand(n,1);y1=y(find(y<1));y2=y(find(y>1));
t=0:1/100:2*pii;
a=(1+sin(t))/2;b=(1+cos(t))/2;
plot(a,b);
hold on;
d=x.*x+y.*y;
h=d(find(d<1));
no=size(h);
piz=(4*no(1))/n;
set(handles.pii,'string',num2str(piz));
% hObject    handle to s (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)


% --- Executes during object creation, after setting all properties.
function n_CreateFcn(hObject, eventdata, handles)
% hObject    handle to n (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc
    set(hObject,'BackgroundColor','white');
else
    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end



function n_Callback(hObject, eventdata, handles)
% hObject    handle to n (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of n as text
%        str2double(get(hObject,'String')) returns contents of n as a double


% --- Executes during object creation, after setting all properties.
function pii_CreateFcn(hObject, eventdata, handles)
% hObject    handle to pii (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc
    set(hObject,'BackgroundColor','white');
else
    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end



function pii_Callback(hObject, eventdata, handles)
% hObject    handle to pii (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of pii as text
%        str2double(get(hObject,'String')) returns contents of pii as a double


% --- Executes during object creation, after setting all properties.
function listbox1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to listbox1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: listbox controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc
    set(hObject,'BackgroundColor','white');
else
    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end


% --- Executes on selection change in listbox1.
function listbox1_Callback(hObject, eventdata, handles)
% hObject    handle to listbox1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: contents = get(hObject,'String') returns listbox1 contents as cell array
%        contents{get(hObject,'Value')} returns selected item from listbox1


% --- Executes on button press in sh.
function sh_Callback(hObject, eventdata, handles)
set(handles.n,'string','0');
set(handles.pii,'string','0');
t=0:1/100:2*pii;
a=(1+sin(t))/2;b=(1+cos(t))/2;
plot(a,b);
% hObject    handle to sh (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)