functions not working for a matrix created in for loop.

Question

Nawaf Aldhawi 2022-5-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1713565-functions-not-working-for-a-matrix-created-in-for-loop

评论： Riccardo Scorretti 2022-5-7

n = input('Enter number of rows: ');
m = input('Enter number of columns: ');
disp('Enter the values of the matrix: ');
sum = 0;
for i = 1:n
    for j = 1:m
        Mat(i,j) = input(' ');
        sum = sum + Mat(i,j);
    end
end
for i = 1:n
    for j = 1:m
        Matrix = zeros(i,j);
    end
end
for i = 1:n
    for j = 1:m
        Matrix(i,j) = Mat(i,j);
    end
end
max = max(max(Matrix))

as you can see here when i run the code, it give me an erorr for the [ max(max(Matrix)) ] function that goes 'Index exceeds the number of array elements (1).'

Thanks in advance!

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Dyuman Joshi 2022-5-7

What's the point of 2nd and 3rd For loops? Both are redundant.

Also, It's best not to use inbuilt function names as variable names - max in this case. Use maximum or something else.

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Answer 1

Riccardo Scorretti 2022-5-7

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1713565-functions-not-working-for-a-matrix-created-in-for-loop#answer_958910

It gives that error the second time you run the code; the very first time it works nice. The problem is that in the last line:

max = max(max(Matrix))

you define a variable max, which "shadows" the homonimous function (= after that, you cannot use the function max anymore, until a variable with the same name exists).

The solution is to rename that variable, for instance:

max_ = max(max(Matrix))