generating a matrix with 2 coordinates

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Umut Oskay
Umut Oskay 2020-4-17
评论： Walter Roberson 2020-4-18
m = input('Enter a number of row (m):'); % Number of rows
n = input('Enter a number of columns (n):'); % Number of Columns
M = randi(100,[m,n]) % It generates random Matrix with the size of m x n
min = inf;
max = 0;
for a = 1:m
for b = 1:n
if M(a,b) < min
min = M(a,b);
mina = a;
minb = b;
end
if M(a,b) > max
max = M(a,b);
maxa = a;
maxb = b;
end
end
end
fprintf('Min is %d at:%d,%d\n',min,mina,minb);
fprintf('Max is %d at:%d,%d\n',max,maxa,maxb);
for c = mina:maxa
for d = minb:maxb
if M(c,d) >= 0
M(c,d) = -M(c,d);
end
end
end
in this code i found the min and the max in the array but i have to generate a matrix with this M(mina,minb) and M(maxa,maxb). These coordinates should be the corners of the matrix.How can i do it can you help me ? By the way there shouldnt be any built in functions. Thanks
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Umut Oskay
Umut Oskay 2020-4-17
Hmm okey. There should be some way to do it . In the previous part you said the same thing but somebody did it well.Thanks
Walter Roberson
Walter Roberson 2020-4-18
Incorrect. James' solution violated the rules about not using built-in functions, and you should have rejected his solution. I responded there listing exactly the names of the built-in functions that were called. Do I need to link to their individual documentation pages to prove that they are functions?
https://www.mathworks.com/help/matlab/ref/subsref.html
Read it. It says explicitly that the function is called to implement indexing.
IN MATLAB IT IS IMPOSSIBLE TO INDEX WITHOUT USING THE FUNCTION NAMED subsref. subsref is a built in function. If your program contains even one subscript use, then it uses a built-in function, which violates the rules of the assignment.

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