index exceeds matrix dimensions

Question

Tarun Pandey 2020-11-21

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/655963-index-exceeds-matrix-dimensions

编辑： ag 2024-9-24，10:59

%consolidation for PTPB

H=10; % total depth of section

Cv=0.5; %in m^2/day

U0=100; %initial U

U1s=0;

U2s=0;

dz=1; % depth of interval

n=H/dz; %no. of depth intervals

t=40; %time in days

dt=1; %time interval

m=t/dt; %total no. of time intervals

Yw=9.81; %in KN/m2

U=zeros(n,m);

i1=input('give value of thresold gradient');

i1=fprintf('i1= %d \n',i1);

a=input('give value of a= %d');

a=fprintf('a= %4d \n',a);

alpha=input('Enter value of alpha= %5d');

alpha= fprintf('alpha = %d \n',alpha);

M=zeros(n,m);

j=0;

for l=dt:dt:39*dt

j=j+1;

for i=2:n

M(i,j)=1-(1-a)*alpha*(1-exp((-alpha/(i1*Yw)*(U(i+1,j)-U(i-1,j))/(2*dz))));

end

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Answer 1

ag 2024-9-24，10:58

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/655963-index-exceeds-matrix-dimensions#answer_1521780

编辑：ag 2024-9-24，10:59

在 MATLAB Online 中打开

Hi Tarun,

I understand that you are encountering the "Index exceeds array bounds" error while executing the shared script. This issue occurs in the following segment of the code:

for i = 2:n
    M(i, j) = 1 - (1 - a) * alpha * (1 - exp((-alpha / (i1 * Yw) * (U(i+1, j) - U(i-1, j)) / (2 * dz))));
end

The error arises because the loop iterates from `i = 2` to `n`, while the matrix `U` has a size of `n`. Therefore, attempting to access the element at the `i+1` index exceeds the array bounds.

To address this issue, you may either increase the size of the matrix `U` by 1 or adjust the loop to iterate until `n-1`, depending on what best suits your requirements.

Hope this helps!