How to print the diagonals of a matrix as shown below.

Question

Evan Mellish 2018-10-19

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/424958-how-to-print-the-diagonals-of-a-matrix-as-shown-below

评论： possibility 2018-10-19

This is my code to create the matrices shown.

    %Part a
prompt1= 'What is the n value?';
prompt2= 'What is the m value?';
n= input(prompt1);
m=input(prompt2);
A=zeros(n,m);
for i=1:n
    for j=1
        A(i,j)=1;
    end
end
for i=1:n
    for j=1:m
       if(i<2)
           A(i,j)=1;
       else if (j<2)
               A(i,j)=1;
           end
       end
    end
end
for i=2:n
    for j=2:m
        A(i,j)= A(i,j-1)+ A(i-1,j);
    end
end
A

I understand that "diag" can be used to display the diagonal of a matrix. However I do not know how to either print the diagonals that go up and to the right.

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madhan ravi 2018-10-19

upload your code

Image Analyst 2018-10-19

Looks very much like homework. So I've tagged it as such. Please read this link so we can give you hints and guide you towards the answer since we can't give you the answer outright or you'd get in trouble with your instructor.

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Answer 1

possibility 2018-10-19

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/424958-how-to-print-the-diagonals-of-a-matrix-as-shown-below#answer_342293

Since it looks like an assignment, I'd like to propose some approaches rather than giving the exact answer to do it.

One exhaustive way to do it: After generating the matrix, you may select a row, add the first element into an empty array. Then go up and right, add the element into the array. Do it in a for loop until you reach the up-edge of the matrix. Create another loop to scan all rows. Then in the second column, add the last element, do the same procedure till you hit the right edge. Scan all remained columns.

Another way by sliding the matrix: Select the left-up corner element. Start increasing the size of the matrix by both column and rows at the same time. Use diag to collect the diag elements.

There may be different ways, of course.