2 dice simulation. Code for when both dice = 6?

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Aaron Brotherton
Aaron Brotherton 2014-11-4
评论： Yusuf Ahmed 2022-6-22
*My first question wasn't clear.
I want to know how many double 6's there are basically.
For example,
a 6 2 6 2 6 1
b 6 4 5 6 6 3
I want something that would return the asnwer 2, indicating 2 double 6's, at positions 1 and 5.
Thanks*
Why won't this code tell me when a and b both equal 6?? I mean I know why, I just don't know what the right code is or how to correct it.
a=randi([1 6],n,1); disp('a='); disp(a);
b=randi([1 6],n,1); disp('b='); disp(b);
c=(a==6);d=(b==6); disp('c'); disp(c); disp('d'); disp(d);
e=(c==1);f=(d==1); disp('e=f'); disp(e==f);
The output I get is all of the times that (a==6)==(b==6) which I don't want.
NB: I've got an input code for n, don't worry.
Basically I need code that tells me the number of times both dice, a and b equal 6 at the same time/roll.
Thanks for any help.

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采纳的回答

James Tursa
James Tursa 2014-11-4
sum((a==6)&(b==6))
Looks like the same question as this newsgroup thread:
http://www.mathworks.com/matlabcentral/newsreader/view_thread/338000

更多回答（3 个）

Orion
Orion 2014-11-4
编辑：Orion 2014-11-4
ok, so
a = [6 2 6 2 6 1];
b = [6 4 5 6 6 3];
posInCommon = intersect(find(a==6),find(b==6))
posInCommon =
1 5
NUmberofoccurence = length(posInCommon)
NUmberofoccurence =
2
Image Analyst
Image Analyst 2014-11-4
编辑：Image Analyst 2014-11-4
For a really simple solution, just check when the sum is 12:
numberOfDouble6s = sum((a+b)==12)
indexes = find((a+b)==12)
Orion
Orion 2014-11-4
I'm not sure to get what you're trying to do.
but a and b are vectors of size nx1.
If you want to know if a and b are the exacts same vectors :
isequal(a,b).
If you want to know if there is a 6 inside a, and inside b :
IsTherea6 = (any(a==6) && any(b==6))
  2 个评论
Orion
Orion 2014-11-4
and to get the number of 6 in a and in b
NumberOf6inA = nnz(a==6);
NumberOf6inB = nnz(b==6);
Aaron Brotherton
Aaron Brotherton 2014-11-4
编辑：Aaron Brotherton 2014-11-4
Thanks for getting back so quick.
I want to know how many double 6's there are basically.
For example,
a 6 2 6 2 6 1
b 6 4 5 6 6 3
I want something that would return the asnwer 2, indicating 2 double 6's, at positions 1 and 5.
Thanks

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