How to create a Aij matrix with the commands 'for', 'function output=name_of_code' and 'imagesc'?

I have to built a Aij matrix where Aij=i^2+j^2 when i=j and Aij=(i-j)^2 when i≠j. After that, I need to execute the code with m=100 and n=150. My teacher said the useful commands are 'for', 'function output=name_of_code' and 'imagesc'. I don't know how to do it and I didn't find any example. I write the code: for A=i^2+j^2

i=j

end

for A=(i-j)^2

i~=j

end

This appear on the command window: i =

0.0000 + 1.0000i

ans =

logical

0

I don't know if what I've done is good. After I write m=[1:100]

n=[1:150]

A=[m,n]

imagesc(A)

function [A]=matrice_A

end

for A=i^2+j^2

i=j

end

It gives me this figure. I don't know if it is good but it doesn't look like a matrix.

[Matt J]

I don't know how to do it and I didn't find any example.

Not even here?

https://www.mathworks.com/help/matlab/ref/for.html#buhafgy-3

[Matt J]

Ariane wrote:

I have to built a Aij matrix where Aij=i^2+j^2 when i=j and Aij=(i-j)^2 when i≠j. After that, I need to execute the code with m=100 and n=150. My teacher said the useful commands are 'for', 'function output=name_of_code' and 'imagesc'. I don't know how to do it and I didn't find any example. I write the code: for A=i^2+j^2

i=j

end

for A=(i-j)^2

i~=j

end

This appear on the command window: i =

0.0000 + 1.0000i

ans =

logical

0

I don't know if what I've done is good. After I write m=[1:100]

n=[1:150]

A=[m,n]

imagesc(A)

function [A]=matrice_A

end

for A=i^2+j^2

i=j

end

It gives me this figure. I don't know if it is good but it doesn't look like a matrix.

Answer 1

[Matt J]

m=100; n=150;

A=((1:m)'-(1:n)).^2;

for i=1:min(m,n)
    
    A(i,i)=2*i.^2;
    
end

imagesc(A)