Need assistance with Fourier analysis and GUI

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Christopher Carey
Christopher Carey 2018-4-14
评论： Walter Roberson 2018-4-14
function varargout = gui212(varargin)
% GUI212 MATLAB code for gui212.fig
% GUI212, by itself, creates a new GUI212 or raises the existing
% singleton*.
%
% H = GUI212 returns the handle t0 a new GUI212 or the handle t0
% the existing singleton*.
%
% GUI212('CALLBACK',hObject,eventData,handles,...) calls the local
% function named CALLBACK in GUI212.M with the given input arguments.
%
% GUI212('Property','Value',...) creates a new GUI212 or raises the
% existing singleton*. Starting from the left, property value pairs are
% applied t0 the GUI before gui212_OpeningFcn gets called. An
% unrecognized property name or invalid value makes property application
% stop. All inputs are passed t0 gui212_OpeningFcn via varargin.
%
% *See GUI Options on GUIDE's Tools menu. Choose "GUI allows only one
% instance t0 run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES
% Edit the above text t0 modify the response t0 help gui212
% Last Modified by GUIDE v2.5 13-Apr-2018 21:27:15
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @gui212_OpeningFcn, ...
'gui_OutputFcn', @gui212_OutputFcn, ...
'gui_LayoutFcn', [] , ...
'gui_Callback', []);
if nargin && ischar(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 gui212 is made visible.
function gui212_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject handle t0 figure
% eventdata reserved - t0 be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% varargin command line arguments t0 gui212 (see VARARGIN)
% Choose default command line output for gui212
handles.output = hObject;
% Update handles structure
guidata(hObject, handles);
% UIWAIT makes gui212 wait for user response (see UIRESUME)
% uiwait(handles.figure1);
% --- Outputs from this function are returned t0 the command line.
function varargout = gui212_OutputFcn(hObject, eventdata, handles)
% varargout cell array for returning output args (see VARARGOUT);
% hObject handle t0 figure
% eventdata reserved - t0 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;
function T0_Callback(hObject, eventdata, handles)
% hObject handle t0 T0 (see GCBO)
% eventdata reserved - t0 be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hints: get(hObject,'String') returns contents of T0 as text
% str2double(get(hObject,'String')) returns contents of T0 as a double
% --- Executes during object creation, after setting all properties.
function T0_CreateFcn(hObject, eventdata, handles)
% hObject handle t0 T0 (see GCBO)
% eventdata reserved - t0 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 && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
function a0_Callback(hObject, eventdata, handles)
% hObject handle t0 a0 (see GCBO)
% eventdata reserved - t0 be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hints: get(hObject,'String') returns contents of a0 as text
% str2double(get(hObject,'String')) returns contents of a0 as a double
% --- Executes during object creation, after setting all properties.
function a0_CreateFcn(hObject, eventdata, handles)
% hObject handle t0 a0 (see GCBO)
% eventdata reserved - t0 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 && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
function an_Callback(hObject, eventdata, handles)
% hObject handle t0 an (see GCBO)
% eventdata reserved - t0 be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hints: get(hObject,'String') returns contents of an as text
% str2double(get(hObject,'String')) returns contents of an as a double
% --- Executes during object creation, after setting all properties.
function an_CreateFcn(hObject, eventdata, handles)
% hObject handle t0 an (see GCBO)
% eventdata reserved - t0 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 && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
function bn_Callback(hObject, eventdata, handles)
% hObject handle t0 bn (see GCBO)
% eventdata reserved - t0 be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hints: get(hObject,'String') returns contents of bn as text
% str2double(get(hObject,'String')) returns contents of bn as a double
% --- Executes during object creation, after setting all properties.
function bn_CreateFcn(hObject, eventdata, handles)
% hObject handle t0 bn (see GCBO)
% eventdata reserved - t0 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 && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
function n_Callback(hObject, eventdata, handles)
% hObject handle t0 n (see GCBO)
% eventdata reserved - t0 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 n_CreateFcn(hObject, eventdata, handles)
% hObject handle t0 n (see GCBO)
% eventdata reserved - t0 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 && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
function x_Callback(hObject, eventdata, handles)
% hObject handle t0 x (see GCBO)
% eventdata reserved - t0 be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hints: get(hObject,'String') returns contents of x as text
% str2double(get(hObject,'String')) returns contents of x as a double
% --- Executes during object creation, after setting all properties.
function x_CreateFcn(hObject, eventdata, handles)
% hObject handle t0 x (see GCBO)
% eventdata reserved - t0 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 && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
% --- Executes on button press in Run.
function Run_Callback(hObject, eventdata, handles)
% hObject handle t0 Run (see GCBO)
% eventdata reserved - t0 be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
axes(handles.axes1);
T0 = str2double(get(handles.T0, 'String'));
a0 = str2double(get(handles.a0, 'String'));
bn = str2double(get(handles.bn, 'String'));
an = str2double(get(handles.an, 'String'));
max_N = str2double(get(handles.n, 'String'));
xrange = str2double(get(handles.x, 'String'));
[x,f]=my_Fourier_series_generator(T0,a0,an,bn,xrange,max_N)
plot(x,f)
function [x,f]=my_Fourier_series_generator(T0,a0,an,bn,xrange,max_N)
x=xrange;
% frequency wn
w=2*pi/T0;
% initializing f at a0
f=a0;
syms n;
% Fourier series implementation
for n=1:max_N
an2=eval(an);
bn2=eval(bn);
f=f+an2*cos(w*n*x)+bn2*sin(w*n*x);
end
These are my errors
Error using eval
Must be a string scalar or character vector.
Error in gui212>my_Fourier_series_generator (line 244)
an2=eval(an);
Error in gui212>Run_Callback (line 226)
[x,f]=my_Fourier_series_generator(T0,a0,an,bn,xrange,max_N)
Error in gui_mainfcn (line 95)
feval(varargin{:});
Error in gui212 (line 42)
gui_mainfcn(gui_State, varargin{:});
Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)gui212('Run_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating UIControl Callback.
These are the arguments i entered
t0=2 a0=0.504 an=0.504*(2/(1+(16*(n^2)))) bn=0.504*((8*n)/(1+(16*(n^2)))) xrange=0:0.1:10 n=500

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回答（1 个）

Walter Roberson
Walter Roberson 2018-4-14
You have
an = str2double(get(handles.an, 'String'));
so we know that an must be a double (and would be NaN if the an edit field did not contain a valid scalar.)
You call
[x,f]=my_Fourier_series_generator(T0,a0,an,bn,xrange,max_N)
so you are passing that scalar (possibly nan) value as the third parameter to the function.
Inside the function you have
an2=eval(an);
so you are trying to eval() that scalar double. It is not permitted to eval() a scalar double: you can only eval() a string object or a character vector.
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Christopher Carey
Christopher Carey 2018-4-14
编辑：Walter Roberson 2018-4-14
however im getting an error when trying a different input these are the inputs
T0=1 a0=1/2 bn=0 an=2/(n*pi)*sin(n*pi/2) bn=0 n=100 xmin=-10 xmax=10 xincrement=0.01
this is my code now
function Run_Callback(hObject, eventdata, handles)
% hObject handle t0 Run (see GCBO)
% eventdata reserved - t0 be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
axes(handles.axes1);
T0 = str2double(get(handles.T0, 'String'));
a0 = str2double(get(handles.a0, 'String'));
bn = (get(handles.bn, 'String'));
an = (get(handles.an, 'String'));
max_N = str2double(get(handles.n, 'String'));
xmin = str2double(get(handles.x1, 'String'));
xmax = str2double(get(handles.x2, 'String'));
xincrement = str2double(get(handles.x3, 'String'));
[x,f]=my_Fourier_series_generator(T0,a0,an,bn,xmin,xmax,xincrement,max
_N)
plot(x,f)
function
[x,f]=my_Fourier_series_generator(T0,a0,an,bn,xmin,xmax,xincrement,max_N)
x1=xmin;
x2=xmax;
x3=xincrement;
x=xmin:xincrement:xmax;
% frequency wn
w=2*pi/T0;
% initializing f at a0
f=a0;
syms n;
% Fourier series implementation
for n=1:max_N
an2=eval(an);
bn2=eval(bn);
f=f+an2*cos(w*n*x)+bn2*sin(w*n*x);
end
This is my error now
Error using gui212>my_Fourier_series_generator (line 248)
Error: This statement is incomplete.
Error in gui212>Run_Callback (line 228)
[x,f]=my_Fourier_series_generator(T0,a0,an,bn,xmin,xmax,xincrement,max_N)
Error in gui_mainfcn (line 95)
feval(varargin{:});
Error in gui212 (line 42)
gui_mainfcn(gui_State, varargin{:});
Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)gui2
12('Run_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating UIControl Callback.
Walter Roberson
Walter Roberson 2018-4-14
We do not know which line is line 248
Reminder:
>> str2double('1/2')
ans =
NaN
1/2 is not a scalar double, it is an expression and cannot be handled by str2double()

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