Index exceeds matrix dimensions. where is mistake

1 Ansicht (letzte 30 Tage)
Sultan Mehmood
Sultan Mehmood am 4 Jul. 2019
Bearbeitet: KALYAN ACHARJYA am 4 Jul. 2019
II=[14 23;44 15];
R=II(:)';
x=0.3;
p=0.343;
for n=2:4;
if x(n-1)>=0 & x(n-1)<=p
x(n)=x(n-1)/p;
else
x(n)=(1-x(n-1))/(1-p);
end
end
A=sort(x);
[A,T]=sort(x);
Y=R(T);
C=reshape(Y,[2,2]);
r = 3.8;
size = 4;
L(1)= 0.234;
for i=2:size
L(i) = r*L(i-1)*(1-L(i-1));
end
mm=min(L);
nn=max(L);
oo=nn-mm;
Z=uint8(8*((L-mm)/oo))+1;
%for i=1:9
%K(i)=mod((abs(L(i))-floor(abs(L(i))))*1e14,50);
%end
CC(1)=bitxor(mod(157,50),mod(Y(1)+Z(1),50));
for i=2:4
CC(i)=bitxor(mod(CC(i-1),50),mod(Y(i)+Z(i),50));
end
X=[12 13 13 14;12 15 16 34;17 18 19 13 ;12 34 32 31];
sX=size(X);
[cA,cH,cV,cD] = dwt2(X,'db4');
subplot(2,2,1);
imagesc(cA);
colormap gray;
title('Approximation');
subplot(2,2,2);
imagesc(cH);
colormap gray;
title('Horizontal');
subplot(2,2,3);
imagesc(cV);
colormap gray;
title('Vertical');
subplot(2,2,4);
imagesc(cD);
colormap gray;
title('Diagonal');
for m=1:2;
for n=1:2;
VV(m,n)=floor(C(m,n)/10);
DD(m,n)=mod(C(m,n),10);
end
end
S = idwt2(cA,cH,VV,DD,'db4',sX);

Antworten (2)

Raj
Raj am 4 Jul. 2019
In line number 17 you have defined
size = 4;
which you are using in your 'for' loop at line 19. This variable is clashing with Matlab inbuilt function 'size' which you are trying to use at line 34. Hence you are getting the error. Change the variable name.
  1 Kommentar
KALYAN ACHARJYA
KALYAN ACHARJYA am 4 Jul. 2019
Bearbeitet: KALYAN ACHARJYA am 4 Jul. 2019
Yes @Raj
Size variable name (line 7) is confliting with inbuilt function name.
II=[14 23;44 15];
R=II(:)';
x=0.3;
p=0.343;
for n=2:4;
if x(n-1)>=0 & x(n-1)<=p
x(n)=x(n-1)/p;
else
x(n)=(1-x(n-1))/(1-p);
end
end
A=sort(x);
[A,T]=sort(x);
Y=R(T);
C=reshape(Y,[2,2]);
r = 3.8;
size1 = 4; %%% Issue was here, I have change the variable name size to size1
L(1)= 0.234;
for i=2:size1
L(i) = r*L(i-1)*(1-L(i-1));
end
mm=min(L);
nn=max(L);
oo=nn-mm;
Z=uint8(8*((L-mm)/oo))+1;
%for i=1:9
%K(i)=mod((abs(L(i))-floor(abs(L(i))))*1e14,50);
%end
CC(1)=bitxor(mod(157,50),mod(Y(1)+Z(1),50));
for i=2:4
CC(i)=bitxor(mod(CC(i-1),50),mod(Y(i)+Z(i),50));
end
X=[12 13 13 14;12 15 16 34;17 18 19 13;12 34 32 31];
sX=size(X);
[cA,cH,cV,cD] = dwt2(X,'db4');
subplot(2,2,1);
imagesc(cA);
colormap gray;
title('Approximation');
subplot(2,2,2);
imagesc(cH);
colormap gray;
title('Horizontal');
subplot(2,2,3);
imagesc(cV);
colormap gray;
title('Vertical');
subplot(2,2,4);
imagesc(cD);
colormap gray;
title('Diagonal');
for m=1:2;
for n=1:2;
VV(m,n)=floor(C(m,n)/10);
DD(m,n)=mod(C(m,n),10);
end
end
S = idwt2(cA,cH,VV,DD,'db4',sX);

Melden Sie sich an, um zu kommentieren.


Aiswarya Subramanian
Aiswarya Subramanian am 4 Jul. 2019
Hello Sultan,
Could you send the error message? In your code you have initialised x = 0.3, which is a scalar. So x(n-1) will give rise to an error.
Also, after your for loop statement, you have put a semi colon (as shown below)
>> for n=2:4;
Hope this helps :)
  2 Kommentare
Raj
Raj am 4 Jul. 2019
x=0.3 is equivalent to x(1)=0.3 which is what is used while indexing x(n-1) for the first time. So no issue there. It will not give error. Also, semicolon after 'for' loop will not give any error.
KALYAN ACHARJYA
KALYAN ACHARJYA am 4 Jul. 2019
Bearbeitet: KALYAN ACHARJYA am 4 Jul. 2019
Also, after your for loop statement, you have put a semi colon (as shown below)
>> for n=2:4;
No @Aiswarya, it does not matter, whether you put or not.
Let's Keep Learning!

Melden Sie sich an, um zu kommentieren.

Kategorien

Mehr zu Colormaps finden Sie in Help Center und File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by