writing a matrix without loop

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ss
ss 2012-12-23
Dear all I want to write a matrix that its arrays are dependent on i and j, could I write it without writing loops. my arrays are something like it a(i,j)=sin(2*pi*(i-1))/((sin(2*pi*(i-1))+sin(2*pi*(j-1))))). Thanks

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Image Analyst
Image Analyst 2012-12-23
Use meshgrid:
m = 0:20;
n = 0:4;
[x y] = meshgrid(m, n);
a = sin(2*pi*y) ./ ((sin(2*pi*y) + sin(2*pi*x)))
imagesc(a);
set(gca, 'ydir', 'reverse');
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Image Analyst
Image Analyst 2012-12-26
x = randi(9, [8 1]) % Random, sample data.
iMinus1 = 0:11
a = x * iMinus1
ss
ss 2012-12-26
thanks for your fast and useful response

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Laura Proctor
Laura Proctor 2012-12-23
Yes, you can create this matrix without using a loop. Use array based mathematical expressions such as ./ and .*
a = sin(2*pi*(ii-1))./(sin(2*pi*(ii-1))+sin(2*pi*(jj-1)));

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