Help finding the min and max of a matrix without using min/max commands
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Vinny
am 9 Apr. 2016
Kommentiert: ahmed yacine LARDJANE
am 30 Nov. 2020
I'm having trouble trying to find the min and max of this matrix. So far I can only get it to display the min which is -12, but it doesn't display the max at all, it just shows the entire matrix when I try to display the max. Any help is appreciated, thank you.
mat2=[-1 0 2;7 -4 12;4 8.2 11;-11 0 -12];
n=size(mat2);
max=mat2;
min=mat2;
for i=1:1:n(1);
for j=1:1:n(2);
if(mat2(i,j)>max);
max=mat2(i,j);
else(mat2(i,j)<min);
min=mat2(i,j);
end
end
end
max
min
1 Kommentar
John D'Errico
am 9 Apr. 2016
For your own sake, NEVER define a variable named min or max, or other existing functions.
If you do, then your next question will be the urgent one, WHY DOES MY CODE THAT TRIES TO USE THE MAX FUNCTION NOT WORK?
Akzeptierte Antwort
Roger Stafford
am 9 Apr. 2016
Change the two lines
max=mat2;
min=mat2;
to
max = -inf;
min = inf;
Note: It is a poor practice to use the terms 'max' and 'min' for variable names, since those are the names for matlab functions.
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Andrei Bobrov
am 9 Apr. 2016
Bearbeitet: Andrei Bobrov
am 9 Apr. 2016
mn = mat2(1);
mx = mat2(1);
for ii = 2:numel(mat2)
if mat2(ii) < mn
mn = mat2(ii);
imn = ii;
elseif mat2(ii) > mx
mx = mat2(ii);
imx = ii;
end
end
without min and max :)
max1 = mat2(sum(bsxfun(@gt,mat2(:),mat2(:)'),2) == numel(mat2)-1);
min1 = mat2(sum(bsxfun(@lt,mat2(:),mat2(:)'),2) == numel(mat2)-1);
1 Kommentar
ahmed yacine LARDJANE
am 30 Nov. 2020
Hello,
could you please answer me here? https://fr.mathworks.com/matlabcentral/answers/669058-finding-min-and-max-of-an-element-without-using-builtin-function/
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