Randomization... if not this then that

2012 11 25
1 个回答
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0 个投票

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

0 个投票

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 2012-11-26
编辑：Brett 2012-11-26
Sorry, I didn't explain the problem well - this does exactly what I said, so thank you. But what I need is that triangle 2 be any triangle that triangle 1 is not (if tri1 = uptri,then tri2 = [downtri, righttri or lefttri] or if tri1 = righttri, tri2 = [downtri, uptri or lefttri] etc). Is there a way to make it so tri2 doesn't equal the value of tri1?
Image Analyst
Image Analyst 2012-11-26
编辑：Image Analyst 2012-11-26
Try randperm then to make sure they are different:
random = randperm(4)
random1 = random(1)
random2 = random(2)
% random1 and random2 are guaranteed to be different
% First assign triangle1
if random1 == 1
tri1 = downtri
b1 = vertbaseq1
elseif random1 == 2
tri1 = uptri
b1 = vertbaseq1
elseif random1 == 3
tri1 = righttri
b1 = horzbaseq1
else
tri1 = lefttri
b1 = horzbaseq1
end
% Next assign triangle2
% Remember random1 and random2 are different
% so triangle2 will be different than triangle1.
if random2 == 1
tri2 = downtri
b2 = vertbaseq2
elseif random2 == 2
tri2 = uptri
b2 = vertbaseq2
elseif random2 == 3
tri2 = righttri
b2 = horzbaseq2
else
tri2 = lefttri
b2 = horzbaseq2
end
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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