Printing Results out of a for Loop

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Ammar Taha
Ammar Taha 2019-6-27
评论： Ruger28 2019-6-27
I have Written a Small Function that Returns the Absolute Difference Between the Max and Min Elements of Each Row in a Matrix and Assigns the Results to the output "rows_diff" as Row Vector and Also Gets the Diff. Between the Max and Min of Whole Matrix in "tot_diff"
All what I want to Know is How to Print Out the Results of the for Loop Returning them in "rows_diff" as row vector not just the Last Result as the Case with this Version of the Function:-
function [rows_diff, tot_diff] = minimax(M)
a = size(M,1);
for i = 1:a
rows_diff = abs(max(M(i,:)) - min(M(i,:)));
end
tot_diff = max(M(:)) - min(M(:));
  2 个评论
Stephen23
Stephen23 2019-6-27
编辑：Stephen23 2019-6-27
Note that avoiding the loop gives simpler, more efficient code:
>> M = magic(5) % fake data.
M =
17 24 1 8 15
23 5 7 14 16
4 6 13 20 22
10 12 19 21 3
11 18 25 2 9
>> minimax(M) % function with loop (following Ruger28's bugfix).
ans =
23 18 18 18 23
>> max(M,[],2) - min(M,[],2) % no loop required, more efficient.
ans =
23
18
18
18
23
Ammar Taha
Ammar Taha 2019-6-27
Thanks Again Stephen, but I was doing an Assigment for a Course and it was Required to use for Loop Specificaly.
I have read this before and I will try to Aviod Looping in Future.

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采纳的回答

Ruger28
Ruger28 2019-6-27
rows_diff = abs(max(M(i,:)) - min(M(i,:)));
This overwrites the value of rows_diff each time. This is ok if you just want to print it out, but to store it (which seems like you want to) you need:
rows_diff(i) = abs(max(M(i,:)) - min(M(i,:)));
to print this value, in your loop place a fprintf
fprintf('Value of rows_diff = %f\n',rows_diff(i))

更多回答（2 个）

Alex Mcaulley
Alex Mcaulley 2019-6-27
You can also implement the function in a simpler and efficient way:
function [rows_diff, tot_diff] = minimax(M)
rows_diff = arrayfun(@(i) abs(max(M(i,:)) - min(M(i,:))),1:size(M,1))';
tot_diff = max(M(:)) - min(M(:));
end
  3 个评论
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Ammar Taha
Ammar Taha 2019-6-27
I have got Benefits from your solution Stephen Cobeldick it Forced me to Review the Format of (max), but as I said it was required to Use Loops
But at all Thank you for your Attention :)

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Ammar Taha
Ammar Taha 2019-6-27
Thank you Ruger28 it Worked :)

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