Randomization... if not this then that

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Brett
Brett 2012-11-25
Here is my code:
random = rand(1)
if random <(1/4)
tri1 = downtri
b1 = vertbaseq1
elseif random>=(1/4) && random<(2/4)
tri1 = uptri
b1 = vertbaseq1
elseif random>=(2/4) && random<(3/4)
tri1 = righttri
b1 = horzbaseq1
elseif random>=(3/4) && random<(4/4)
tri1 = lefttri
b1 = horzbaseq1
end
if random <(1/4)
tri2 = downtri
b2 = vertbaseq2
elseif random>=(1/4) && random<(2/4)
tri2 = uptri
b2 = vertbaseq2
elseif random>=(2/4) && random<(3/4)
tri2 = righttri
b2 = horzbaseq2
elseif random>=(3/4) && random<(4/4)
tri2 = lefttri
b2 = horzbaseq2
end
...
So what this code basically does is randomize between four different triangles at four different locations. The problem: it randomizes the same triangle to each location. I need the some code that says something like if triangle 1 (tri1) is an up triangle (uptri) then triangle 2 will be any triangle that isn't an up triangle.
any help would be greatly, greatly! appreciated, Brett

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Image Analyst
Image Analyst 2012-11-25
After your first if, have this instead of the second if:
if tri1 == uptri
% Triangle 2 can't be an uptriangle.
random = rand(1);
if random <(1/3)
tri2 = downtri
b2 = vertbaseq2
elseif random>=(1/3) && random<(2/3)
tri2 = righttri
b2 = horzbaseq2
else
tri2 = lefttri
b2 = horzbaseq2
end
else
% Triangle 2 can be anything.
if random <(1/4)
tri2 = downtri
b2 = vertbaseq2
elseif random>=(1/4) && random<(2/4)
tri2 = uptri
b2 = vertbaseq2
elseif random>=(2/4) && random<(3/4)
tri2 = righttri
b2 = horzbaseq2
elseif random>=(3/4) && random<(4/4)
tri2 = lefttri
b2 = horzbaseq2
end
end
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Brett
Brett 2012-11-27
This works perfectly! I can't thank you enough!
Image Analyst
Image Analyst 2012-11-27
You're welcome. Not bad for me just writing it and not even being able to run it or test it!

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