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How to efficiently encode two values as a unique entitiy

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balandong
balandong 2018-11-23
回答： Andrei Bobrov 2018-11-23
Dear all,
With respect to the above subject, I wonder if we can make the following code more efficient and compact (reduce the ifelse)..
A=3;
B=3;
C=[];
if A==1 && B==1
C=1;
elseif A==1 && B==2
C=2;
elseif A==1 && B==3
C=3;
elseif A==2 && B==1
C=4;
elseif A==2 && B==2
C=5;
elseif A==2 && B==3
C=6;
elseif A==3 && B==1
C=7;
elseif A==3 && B==2
C=8;
elseif A==3 && B==3
C=9;
end
In addition, I also wonder if we can scale it up for A=[2;2;3;1] and B= [1;1;3;1]
Thanks in advance

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采纳的回答

Stephen23
Stephen23 2018-11-23
编辑：Stephen23 2018-11-23
M = [1,2,3;NaN,4,5;6,7,8];
C = M(A,B)
"In addition, I also wonder if we can scale it up for A=[2;2;3;1] and B= [1;1;3;1]"
arrayfun(@(a,b)M(a,b),A,B)

更多回答（1 个）

Andrei Bobrov
Andrei Bobrov 2018-11-23
in your case:
>> A=[3;3;3;1]; B= [1;1;3;1];
f = @(A,B) 3*(A(:) - 1) + B(:);
C = f(A,B)
C =
7
7
9
1
>>

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