Produce matrix with loop
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Hi! I have a homework problem that I have difficulties with.
The problem is asking me to create a m by n matrix, using a function file, whose elements are going to be the sum of the index of each element. For exemple my first column would be A(1,1)=2 A(2,1)=3 A(3,1)=4 and so on.. I also must use the ''for'' loop. I tried to figure out how am I going to solve this problem before typing anything in my script file, so I thought that I could assign a matrix composed of ones, and of the dimensions of my outpout argument like U=ones(m,n) so my index variable ''k'' in my for loop could give the right value of each one after each pass, but I can't figure out hiow can I do that.. Can you give me a hint ?
Thanks!
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Respuesta aceptada
Matt Fig
el 26 de Feb. de 2011
Most people on here will not just do a whole homework assignment for you. If you don't do any work, you will not learn. I will show you most of the solution, and I bet you can easily fill in the rest. Be sure to study it so you understand.
function A = elems_sum(m,n)
% Put help here.
for ii = 1:m
for jj = 1:n
A(ii,jj) = ??????;
end
end
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Más respuestas (1)
chris hinkle
el 27 de Feb. de 2011
Here's an idea, tell your teacher not to promote for loops and take advantage of matlabs strength in vectorized functions
Matr=ones(m, n); [y,x] = find(Matr > 0); indMat = y+x;
The less you use for loops the better!
2 comentarios
Matt Fig
el 27 de Feb. de 2011
You could have just used find(Matr) without first doing the logical comparison. And I think you meant:
Matr=ones(m, n); [y,x] = find(Matr); Matr(:) = y+x
We can even do without using FIND all together:
A = cumsum([2:m+2;ones(n-2,m+1)])
chris hinkle
el 27 de Feb. de 2011
Good point matt, and yes I was just being sloppy just answered this on my phone!
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