how to efficiently encode two values as a unique entitiy
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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==2
C=4;
elseif A==2 && B==3
C=5;
elseif A==3 && B==1
C=6;
elseif A==3 && B==2
C=7;
elseif A==3 && B==3
C=8;
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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Jan
2018-11-23
编辑:Jan
2018-11-23
Start with a simplification by omitting repeated comparisons:
A = 3;
B = 3;
C = [];
if A == 1
if B == 1
C = 1;
elseif B == 2
C = 2;
elseif B == 3
C = 3;
end
elseif A == 2
if B == 2
C = 4;
elseif B == 3
C = 5;
end
elseif A == 3
if B == 1
C = 6;
elseif B == 2
C = 7;
elseif B == 3
C = 8;
end
end
This should run faster, but is not much nicer. What about switch ?
A = 3;
B = 3;
C = [];
switch A
case 1
switch B
case 1
C = 1;
case 2
C = 2;
case 3
C = 3;
end
case 2
switch B
case 2
C = 4;
case 3
C = 5;
end
case 3
switch B
case 1
C = 6;
case 2
C = 7;
case 3
C = 8;
end
end
end
Nope, not nicer also.
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