Modify the code from the previous example

Question

Abigail McGahey 2019-2-19

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/445706-modify-the-code-from-the-previous-example

评论： Walter Roberson 2019-2-22

clear, close all;
% Activity problem 6
 
% First example. With a loop, no ligical indexing.
 
N=6;
%NxN magic square
A=magic(N);
%Initialise B to be the same size as A with ones
B=ones(N);
 
%Set B to one where A is divisible by 3
%Loop over all elements
for row=1:N
    for col=1:N
        %Get current elemnet's value.
        value=A(row,col);
        %Is it a multiple of 3:
        if (mod(value,3)==0)
            B(row,col)=0;
        end
    end
end
 
disp(B)
 
% Second example, use logical indexing.
 
N=6;
A=magic(N)
 
B=ones(N);
indices=mod(A,3)==0;
B(indices)=0;
 
disp(B)
 
% part c
 
B(mod(A,3)==0)=0;

Now, based on the practice above, modify the code so that it starts with a magic square of size 5x5 and produces a second array that has a value of one where the magic square element is odd and a value of 2 where the corresponding magic square element is even.

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Abigail McGahey 2019-2-19

okay, so to be more clear, I am struggling to figure out how to replace the odd elements with one and the even elements with the value of two.

Walter Roberson 2019-2-22

"I am struggling" is not a question. A question might be something like how to write loops, or how to detect that a value is odd or even.

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Answer 1

Pranjal Priyadarshi 2019-2-22

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https://ww2.mathworks.cn/matlabcentral/answers/445706-modify-the-code-from-the-previous-example#answer_362210

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The code below takes a magic square of size 6 and replaces the even elements with 2 and replaces the odd elements with 1.

N=6;
A=magic(N);
evenindex=(mod(A,2) == 0); %finds the index for even elements
finalans=A;
finalans(evenindex)=2; %replaces even elements with 2
finalans(~evenindex)=1; %replaces odd elements with value 1
disp(A);
disp(finalans);