Help with finding the min/max for 3 matrices

Question

Vinny 2016-4-14

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/279055-help-with-finding-the-min-max-for-3-matrices

回答： Walter Roberson 2016-4-14

I have a function mfile here

function[maxm]=my_matrix(a)
n=size(a);
maxm=-inf;
minm=inf;
for i=1:1:n(1);
  for j=1:1:n(2);
      if(a(i,j)>maxm);
          maxm=a(i,j);
      else(a(i,j)<minm);
          minm=a(i,j);
      end
  end
end

and three matrices that display the following mins and maxs

 a=[3 -2 1;4 0 5;1 2.2 -3]         maxm=5
 [m]=my_matrix(a);                 minm=-3
 a=[4 2 1;9 3 5]                   maxm=9
 [m]=my_matrix(a);                 minm=5
 a=[9 8;7 6;5 4]                   maxm=9
 [m]=my_matrix(a);                 minm=4

It shows the correct outputs for all three matrices except the minm for the second matrix,it should be 1, not 5. What do I need to change to get it to show the correct min? And yes, I know I could simply just use the min/max command, but for this assignment I'm not allowed to use commands like that.

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Answer 1

Walter Roberson 2016-4-14

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/279055-help-with-finding-the-min-max-for-3-matrices#answer_217955

The first value in the array will be greater than -inf and less than inf but you do not update both of those variables, only the first, because you use "elseif"