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how to write a function to find max & min value in array

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ahmed ali
ahmed ali 2011-7-10
评论： DGM 2023-2-27
hi every one I really need your help in this question write a function m.file to find the maximum and minimum number in array *do not use the built in functions in matlab* ? i know how to find it but i don't know how to make a function ?? could anyone help me ?
  2 个评论
Steven Lord
Steven Lord 2022-8-18
Since this is likely a homework assignment, show us the code you've written to try to solve the problem and ask a specific question about where you're having difficulty and we may be able to provide some guidance.
If you aren't sure where to start because you're not familiar with how to write MATLAB code, I suggest you start with the free MATLAB Onramp tutorial to quickly learn the essentials of MATLAB.
If you aren't sure where to start because you're not familiar with the mathematics you'll need to solve the problem, I recommend asking your professor and/or teaching assistant for help.
If you're asking for a "proper answer" to the question as originally asked, that question is impossible since the relational operators like > and <= are built-in functions in MATLAB.

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采纳的回答

Andrei Bobrov
Andrei Bobrov 2011-7-10
try it
function [ma mi] = alifun(A)
aw = A(:);
ma = aw(1);
mi = aw(1);
for i1 = 2:numel(aw)
if ma < aw(i1), ma = aw(i1);
elseif mi > aw(i1), mi = aw(i1);
end
end
end

更多回答（3 个）

Paulo Silva
Paulo Silva 2011-7-10
Have a look at Doug’s MATLAB Video Tutorials and Declare function
After you watch those nice video tutorials about functions and read the documentation try to do your function and if you have any specific question please ask and we will be here to help you.
  5 个评论
显示 3更早的评论
Image Analyst
Image Analyst 2011-7-10
移动：DGM 2023-2-27
Also note that you used the wrong index, "a" instead of i. It should be
if Array(i)>Maximum
Maximum=Array(i);
end
or better yet, don't use i and j as indexes at all since they are the imaginary constants.

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Dave Correa
Dave Correa 2011-7-10
Hello;
You can to use the following code;:
example:
>> array=magic(8)
>> [maximum,minimun]=find_maxmin(array)
maximun =
64
minimun =
1
Regards,
Dave Correa
correa.dave30@gmail.com
http://fismatlab.blogspot.com/
function [maximum,minimun]=find_maxmin(array)
maximun=max(max(array))
minimun=min(min(array))
  2 个评论
Dave Correa
Dave Correa 2011-7-10
I think that this would be the simplest way to define a search function for maximum and minimum of a data matrix.
regards
Dave
Image Analyst
Image Analyst 2011-7-10
Yes, except this was a homework problem where his instructor said not to use built in functions like max and min.

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Mohammed Raihan
Mohammed Raihan 2021-3-7
编辑：DGM 2023-2-27
function[Max, Min]=minimax(M)
Max=max(M')-min(M');
maxa=max(M');
maxa2=max(maxa);
mini=min(M');
mini2=min(mini);
Min=maxa2-mini2;
end
  1 个评论
DGM
DGM 2023-2-27
This does not meet the requirements of the original question. The original question requires that min() and max() aren't used.

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