Thread Subject:

Error - Index exceeds matrix dimensions..?

Hi there, can anyone tell me what is wrong with my short piece of
code:

name = input('Please enter name of wav file to be processed
(noextension): ','s');
fname1 = [name '.wav'];
[y Fs] = wavread(fname1);
x = y([1:(30*Fs)]);
wavwrite(x,Fs,'excerpt2.wav')
Freq_Response = fft(x);
Magnitude = abs(Freq_Response);
Power = Freq_Response.*conj(Freq_Response);
Display_Freq = fftshift(Power);
Display_Freq2 = fftshift(Magnitude);
plot(Display_Freq2);

It returns the error message:

??? Error using ==> run
Index exceeds matrix dimensions.

I'm pretty sure it's something wrong with this line: x =
y([1:(30*Fs)]); ..But I really don't know what... Thanks for any
help!

John schrieb:
> Hi there, can anyone tell me what is wrong with my short piece of
> code:
>
> name = input('Please enter name of wav file to be processed
> (noextension): ','s');
> fname1 = [name '.wav'];
> [y Fs] = wavread(fname1);
> x = y([1:(30*Fs)]);
> wavwrite(x,Fs,'excerpt2.wav')
> Freq_Response = fft(x);
> Magnitude = abs(Freq_Response);
> Power = Freq_Response.*conj(Freq_Response);
> Display_Freq = fftshift(Power);
> Display_Freq2 = fftshift(Magnitude);
> plot(Display_Freq2);
>
> It returns the error message:
>
> ??? Error using ==> run
> Index exceeds matrix dimensions.
>
> I'm pretty sure it's something wrong with this line: x =
> y([1:(30*Fs)]); ..But I really don't know what... Thanks for any
> help!

I suggest first to execute the expressions one by one, to be really
sure, which one causes the problem.

Michael

Obviously there are no 30 seconds of sound saved in that file, i.e.
vector y is less than 30*Fs elements long.

Markus

Markus <bhr3@gmx.de> wrote in message <ef4d07b.1@webcrossing.raydaftYaTP>...
> Obviously there are no 30 seconds of sound saved in that file, i.e.
> vector y is less than 30*Fs elements long.
>
> Markus
 hello all,
I had also received the same error in one of my programs. the code runs as follows:

function y=allow(p)
 
syms p
v=p(1:3);
t=p(4);

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

load actvar

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

if t == 0
    U_1(1:8,1)=zeros(8,1);
    t_1=-T;
    tim(1)=0;
    count=1;
else
    load alloc
end
U_2=U_1;

%%%ASSIGNMENT OF VALUES%%%%
BB=G

ud = zeros(8,1);

Wu=(diag([1,1,1,1,25,25,25,25]))
Wv=diag([100,100,100])

umin_act=[ -5 -5 -5 -5 -8 -8 -8 -8]'; %%%value in degrees
umax_act=-umin_act;

ratelb=[-15 -15 -15 -15 -15 -15 -15 -15]'; %%%value in degrees/second
rateub=-ratelb; %%%value in degrees/second


    imax = 500; % Heuristic value
% [k,m] = size(B);
    tol = 1e-8;
    gam = 1e3;

%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%
if t_1+T-0.000001 <= t
   
    tic;

 umin=max(Ulower_act,U_1+ratelb*T)
 umax=min(Uupper_act,U_1+rateub*T)
 

    

   u=ip_alloc(BB,v,umin,umax,Wv,Wu,ud,gam,tol,imax)
                                    
    %%UPDATION%%
    U_1(1:8,1)=u;
% U_1(9,1)=gama;
    t_1=t_1+T;
    tim(count)=toc;
    count=count+1;
    
    
elseif t_1>t
    u=U_2(1:8);
else
    u=U_1(1:8);
end

y(1:8,1)=u

save alloc U_1 U_2 t_1 tim count



%%%ALLOCATION ALGORITHM

function [u] = ip_alloc(B,v,umin,umax,Wv,Wu,ud,gam,tol,imax)

.............................

%%%%%%%%%%%%%%%%%%

the program, when run, gives the error "index exceeds matrix dimensions" at the line
v=p(1:3); itself. can anyone help me to overcome this problem? this is an urgent requirement.

Anwesha

"Anwesha " <majantali.sarkar@gmail.com> wrote in message <ghqecg$9mf$1@fred.mathworks.com>...
...
> hello all,
> I had also received the same error in one of my programs. the code runs as follows:
>
> function y=allow(p)
>
> syms p
> v=p(1:3);
...
> the program, when run, gives the error "index exceeds matrix dimensions" at the line
> v=p(1:3); itself. can anyone help me to overcome this problem? this is an urgent requirement.
>
Dear Anwesha,

Apparently, the variable p does not have enough elements, so extracting the first three of them fails. This could occur if you call the function with an improper argument like in
"allow(2)" or "allow([1 2])". So, check your call to this function.

hth
Jos

"Anwesha " <majantali.sarkar@gmail.com> wrote in message
news:ghqecg$9mf$1@fred.mathworks.com...
> Markus <bhr3@gmx.de> wrote in message
> <ef4d07b.1@webcrossing.raydaftYaTP>...
>> Obviously there are no 30 seconds of sound saved in that file, i.e.
>> vector y is less than 30*Fs elements long.
>>
>> Markus
> hello all,
> I had also received the same error in one of my programs. the code runs as
> follows:
>
> function y=allow(p)
>
> syms p

This line overwrites the input argument p with a 1-by-1 sym object p.
That's why the next line of your code fails.

If instead you want to convert your input argument p into a sym object, use:

p = sym(p);

> v=p(1:3);
> t=p(4);

*snip*

--
Steve Lord
slord@mathworks.com

I could not find any such parameter mismatch in my code but I am also getting the same error of "Index exceeding Matrix dimensions". Please help.

% --- Executes just before result is made visible.
function result_OpeningFcn(hObject, eventdata, handles, varargin)

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

% Update handles structure
guidata(hObject, handles);

 set(handles.txt_1Name,'string',varargin(1));
 set(handles.txt_1Score,'string',varargin(2));
set(handles.txt_2Name,'string',varargin(3));
 set(handles.txt_2Score,'string',varargin(4));
set(handles.txt_3Name,'string',varargin(5));
 set(handles.txt_3Score,'string',varargin(6));

% --- Outputs from this function are returned to the command line.
function varargout = result_OutputFcn(hObject, eventdata, handles)
varargout{1} = handles.output;


% --- Executes on button press in bt_Ok.
function bt_Ok_Callback(hObject, eventdata, handles)
delete(gcf);

your .wav file which you take in "fname1 = [name '.wav'];" is too small. If you just take a bigger file (more samples), it would solve the problem



John <ruffryder6669990@aol.com> wrote in message <ef4d07b.-1@webcrossing.raydaftYaTP>...
> Hi there, can anyone tell me what is wrong with my short piece of
> code:
>
> name = input('Please enter name of wav file to be processed
> (noextension): ','s');
> fname1 = [name '.wav'];
> [y Fs] = wavread(fname1);
> x = y([1:(30*Fs)]);
> wavwrite(x,Fs,'excerpt2.wav')
> Freq_Response = fft(x);
> Magnitude = abs(Freq_Response);
> Power = Freq_Response.*conj(Freq_Response);
> Display_Freq = fftshift(Power);
> Display_Freq2 = fftshift(Magnitude);
> plot(Display_Freq2);
>
> It returns the error message:
>
> ??? Error using ==> run
> Index exceeds matrix dimensions.
>
> I'm pretty sure it's something wrong with this line: x =
> y([1:(30*Fs)]); ..But I really don't know what... Thanks for any
> help!