Randomization... if not this then that

Question

Brett 2012-11-25

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/54762-randomization-if-not-this-then-that

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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Answer 1

Image Analyst 2012-11-25

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/54762-randomization-if-not-this-then-that#answer_66480

在 MATLAB Online 中打开

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