MATLAB: When i run the code, it generates error of type …………??? Index exceeds matrix dimensions. Error in ==> Dabachie at 42 a1=h0s(2m)+h1s(2m+1)+h2s(2m+2)+h3s(2m+3);.……….……….i don’t know how to fix it. plz help me

clear all close all

t=0:1/1023:1; s = 20*t.^(2).*((1-t).^(4)).*(cos(12*pi*t)); plot(t,s); title('Origional Signal') %plot of first trend after haar wavelet transform ylabel('Amplitude') xlabel('Time')

if mod(length(s),2)~=0 s=[s 0]; end

d=length(s); m=1:d/2;

h0= (1+sqrt(3))/(4*(sqrt(2))); h1= (3+sqrt(3))/(4*(sqrt(2))); h2= (3-sqrt(3))/(4*(sqrt(2))); h3= (1-sqrt(3))/(4*(sqrt(2)));

g0=h3; g1=-h2; g2=h1; g3=-h0;

% %Daubechies Scaling Function a1=h0*s(2*m)+h1*s(2*m+1)+h2*s(2*m+2)+h3*s(2*m+3);

% %Daubechies Wavelet Function d1=g0*s(2*m)+g1*s(2*m+1)+g2*s(2*m+2)+g3*s(2*m+3);

figure() subplot(2,1,1) plot(t,s) title('Original Signal') %plot of the original signal ylabel('Amplitude') xlabel('Time') axis tight

subplot(2,1,2) plot(t,[a1 d1]) title('Transformed Signal') %plot of the final signal obtained after the transformation xlabel('Amplitude') ylabel('Time') axis tight

Best Answer

s has 1024 elements and m is a vector with a max value of 512. You're trying to get the 2*m+1 and when m = 512, this will refer to the 1025th element of s. But s doesn't have that many elements.

Related Solutions

MATLAB: Plotting a plane in 3d:

%% MATRIX SPACES B4 AND AFTER ROW REDUCTION:
clear ; clc ; 
% Create the Matrix: (matrix M)
M = [3,2 ; 5,7 ; 9,1] ; 
% And it's Row Reduced Form:
Mr = rref(M) ; 
% Now let's see how Columns Space of the matrix M changes after it's
% converted into it's rref form:
figure(14) ; clf ; hold on ; 
% ===================== Why This Code is Not working =================
% % 
funx1 = @(s,t) M(1,1)  *s  + M( 1,2)*t ; 
funx2 = @(s,t) Mr(1,1) *s  + Mr(1,2)*t ; 
funy1 = @(s,t) M(2,1)  *s  + M( 2,2)*t ; 
funy2 = @(s,t) Mr(2,1) *s  + Mr(2,2)*t ;
funz1 = @(s,t)  M(3,1) *s +  M( 3,2)*t ; 
funz3 = @(s,t) Mr(3,1) *s +  Mr(3,2)*t ;
h1 = fmesh( funx1 , funy1 , funz1  , repmat( [-1 1] , [1,2] )) ;
h2 = fmesh( funx2 , funy2 , funz3  , repmat( [-1 1] , [1,2] )) ;
% ============================================================================
% Draw the planes spaned by M and Mr :
h1 = fmesh( @(s,t) M(1,1)  *s  + M( 1,2)*t  , ...
            @(s,t) M(2,1)  *s  + M( 2,2)*t  , ...
            @(s,t)  M(3,1) *s +  M( 3,2)*t  , ...
            [-0.25 , 0.25] ) ; 
        
h2 = fmesh( @(s,t) Mr(1,1)  *s  + Mr( 1,2)*t  , ...
            @(s,t) Mr(2,1)  *s  + Mr( 2,2)*t  , ...
            @(s,t) Mr(3,1) *s   + Mr( 3,2)*t  , ...
            [-1 , 1] ) ; 
        
 
% Adjusting colors for Visiblity:
set(h1 , 'facecolor' , '#77AC30' , 'LineStyle' , 'none' , 'FaceAlpha' , 0.9 ) ; % green
set(h2 , 'facecolor' , [0.4940 0.1840 0.5560] , 'LineStyle' , 'none' , 'FaceAlpha' , 0.9 ) ; % violet
% Draw Normalized Basis Vectors:
N = M / norm(M) ; 
% Vectors to Plot: v1 - vector 1:
v1 = [ N(:,1)'  ; [0 0 0] ] ; 
v2 = [ N(:,2)'  ; [0 0 0] ] ;
v3 = [ Mr(:,1)' ; [0 0 0] ] ;
v4 = [ Mr(:,2)' ; [0 0 0] ] ;
% Default Blue Color
plot3( v1(:,1) , v1(:,2) , v1(:,3) , 'color' , [0 0.4470 0.7410]      , 'linew' , 4 ) ; 
plot3( v2(:,1) , v2(:,2) , v2(:,3) , 'color' , [0 0.4470 0.7410]      , 'linew' , 4 ) ; 
% Yellow Color
plot3( v3(:,1) , v3(:,2) , v3(:,3) , 'color' , '#EDB120' , 'linew' , 4 ) ; 
plot3( v4(:,1) , v4(:,2) , v4(:,3) , 'color' , '#EDB120' , 'linew' , 4 ) ; 
xlabel('M_1') ; ylabel('M_2') ; zlabel('M_3') ; 
axis square ; grid on ; rotate3d on ; 
set(gca , 'fontsize' , 18 , 'fontweight' , 'bold') ;
title('\fontsize{25} Column Space of M And rref(M) :')
legend({'C(M)';'C(rref(M))'})

MATLAB: Conversion of [h,m,s] to h:m:s

You can easily convert the numeric array to a character array using sprintf:

>> A = [12,34,15;16,02,59];
>> B = reshape(sprintf('%02d:%02d:%02d',A'),[],size(A,1))'
B =
12:34:15
16:02:59

And simply wrap this in a cellstr to get these as strings in a cell array:

>> cellstr(B)
ans = 
    '12:34:15'
    '16:02:59'

Best Answer

Related Solutions

MATLAB: Plotting a plane in 3d:

MATLAB: Conversion of [h,m,s] to h:m:s

Related Question