清空筛选条件
清空筛选条件

"index exceeds matrix dimensions" error.

2 次查看（过去 30 天）
Daniel
Daniel 2011-3-8
评论： Walter Roberson 2017-3-7
I keep getting the "index exceeds matrix dimensions" error when I get to problem 3 with my code. If i were to run the code separately and using clc and clear, it works fine. I also have to use clc and clear every time i want to run my code. Is there any way I can run it without doing so? Thank you! This is my code:
%Problem 1
disp('Answers to Problem 1: ')
fprintf('\n')
N = input('Please enter an integer: ');
while (N < 0 ||(N~=fix(N)));
disp('You have entered an invalid integer. Please try again. ')
N = input('Please enter an integer: ');
end
a = sum(1:N);
fprintf('The sum of integers from 1 to %.0f is: %.2f\n ',N,a)
sum = 0;
for a = 1:N;
sum = sum+a;
end
fprintf('The sum of integers 1 to %.0f is: %.2f\n ',N,sum);
%Problem 2
fprintf('\n')
disp('Answers to Problem 2: ')
fprintf('\n')
K = input('Please enter an integer: ');
product = 1;
while (K < 0 ||(K~=fix(K)))
disp('You have entered an invalid number. Please try again. ')
K = input('Please enter an integer: ');
end
y = prod(1:K);
fprintf('The product of integers 1 to %.0f is: %.1f\n ',K,y)
for y = [1:K];
product = product*y;
end
fprintf('The product of integers 1 to %.0f is: %.1f\n',K,product)
%Problem 3
fprintf('\n')
disp('Answers to Problem 3: ')
fprintf('\n')
Vector = input('Enter a vector while using [] around the numbers: ');
b = sum(Vector);
fprintf('The sum of the elements in the vector = %.3f\n ',b)
sumvec = 0;
w = length(Vector);
for e = 1:w
sumvec = sumvec + Vector(e);
end
fprintf('The sum of the elements in the vector = %.3f\n ',sumvec)
%Problem 4
fprintf('\n')
disp('Answers to Problems 4: ')
fprintf('\n')
P = input('Please enter a value for the first number: ');
Q = input('Please enter a value for the second number: ');
if (P < 0||(P~=fix(P)||(Q~=fix(Q)||(P > Q))))
disp('Please enter valid integers.')
fprintf('\n')
disp('I.E. Whole numbers & first number must be less than the second number.')
P = input('Please enter a value for the first number: ');
Q = input('Please enter a value for the second number: ');
else
t = prod(P:Q);
fprintf('The product of %d to %d is: %d\n ',P,Q,t)
product = 1;
for u = [P:Q];
product = product*u;
end
fprintf('The product of %d to %d is: %d\n ',P,Q,product)
end
%Problem 5
fprintf('\n')
disp('Answer to Problem 5: ')
fprintf('\n')
for k = 1:4
for t = 4:-1:k
fprintf('*')
end
fprintf('\n')
end
for k = 4:-1:1
for t = 4:-1:k
fprintf('^')
end
fprintf('\n')
end

请先登录，再回答此问题。

采纳的回答

Walter Roberson
Walter Roberson 2011-3-8
In problem 1, you defined "sum" as a variable. Then in problem 3, you attempt to use "sum" as a function.

更多回答（4 个）

Sean de Wolski
Sean de Wolski 2011-3-8
It probably means that whatever variable you're using to index is already defined elsewhere and not redefined in your code. Type
dbstop if error
and inspect the variables when it errors out. You don't need clc and you should be able to use
clearvars
instead of clear; just insert it at the top of the script.
Daniel
Daniel 2011-3-8
Ah, thank you walter! i changed the sum variable to a different name and it worked. and thank you sean! i could also just write "clear" before each code in each problem and that would also take care of my problem.
maged al-dhaeebi
maged al-dhaeebi 2013-4-22
编辑：Walter Roberson 2013-4-22
Index exceeds matrix dimensions.
I have the same probelm in my code hwo to solve this
my code it :
FolderNames={'Data0', 'Data45','Data90','Data135','Data180','Data225','Data270','Data315'}
FolderIndx=1
SaveFileName=strcat('ProcessData',num2str(FolderIndx));
SaveImageFileName=strcat('ImageData',num2str(FolderIndx));
AngleAr=45*[4,5,6,7,0,1,2,3]';
FoldName=FolderNames{FolderIndx}
list=ls(FoldName)
for FrqIndx=1 : 3
FileName=strcat(FoldName,'\', list(FrqIndx+2,:));
StrData=load(FileName);
[XData,YData,ZData,ImageData]=ProcessRawData(StrData,AngleAr,FolderIndx)
SpotsDataX{FrqIndx}=XData;
SpotsDataY{FrqIndx}=YData;
SpotsDataZ{FrqIndx}=ZData;
Images{FrqIndx}=ImageData;
size(Images)
end
save (SaveFileName,'SpotsDataX','SpotsDataY','SpotsDataZ');
save (SaveImageFileName,'Images');
  1 个评论
Walter Roberson
Walter Roberson 2013-4-22
Which line does the problem occur on?
Your code assumes that each of those folders already contains at least 5 directory entries including "." and ".." (which are not promised to be the first two entries, by the way.) If one of the folders contains fewer entries then you would get index out of range accessing list(FrqIndx+2,:)

请先登录，再进行评论。

Manjiree Waikar
Manjiree Waikar 2017-3-7
编辑：Walter Roberson 2017-3-7
I have this error in my code as
Index exceeds matrix dimensions. Error in clusteredit (line 21) green = imIDX(:,:,2); % Green channel
Please help me how to tackle this error.
My code is-
clear all;
newImageRGB = imread('p2_left_norm_1.bmp');
figure;
imshow(newImageRGB);
title('Original image');
grayImage = rgb2gray(newImageRGB);
figure;
imshow(grayImage);
title('grayscale image');
afterWiener = wiener2(grayImage,[6 6]);
figure;
imshow(afterWiener);
title('Wiener filter');
imData=reshape(afterWiener,[],1);
imData=im2double(imData);
[IDX mn]=kmeans(imData,3);
imIDX=reshape(IDX,size(afterWiener));
red = imIDX(:,:,1); % Red channel
green = imIDX(:,:,2); % Green channel
blue = imIDX(:,:,3); % Blue channel
a = zeros(size(imIDX, 1), size(imIDX, 2));
just_red = cat(3, red, a, a);
just_green = cat(3, a, green, a);
just_blue = cat(3, a, a, blue);
back_to_original_img = cat(3, red, green, blue);
figure,
imshow(just_red),
title('Red channel')
figure,
imshow(just_green),
title('Green channel')
figure,
imshow(just_blue),
title('Blue channel')
  1 个评论
Walter Roberson
Walter Roberson 2017-3-7
Looking in reverse order, you have
green = imIDX(:,:,2); % Green channel
after
imIDX=reshape(IDX,size(afterWiener));
after
afterWiener = wiener2(grayImage,[6 6]);
after
grayImage = rgb2gray(newImageRGB);
So you are taking an RGB image, transforming it to gray, doing a wiener2 transform on it, getting a 2D result. The size of the 2D result is used to reshape the matrix IDX, so the result of the reshape is going to be 2D. You then try to index the third dimension of that 2D matrix.
Possibly at some point after reshaping IDX, you wanted to use those indices to index into the original color image, such as
R = newImageRGB(:,:,1);
G = newImageRGB(:,:,2);
B = newImageRGB(:,:,3);
red = R(IDX);
green = G(IDX);
blue = B(IDX);

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Images 的更多信息

标签

尚未输入任何标签。

产品

Community Treasure Hunt

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

Start Hunting!

Translated by