Comparing first n digits
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wesso Dadoyan
el 25 de Oct. de 2017
Comentada: Rik
el 25 de Oct. de 2017
Hi ,
I have two columns of numbers A and B. A is 9 digits and B is 8 digits. How can I find the row in B that matches A(i) in a loop (i=1:length(A))
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Rik
el 25 de Oct. de 2017
I would recommend not using a loop. If you have stored the number in a number format, just divide the A by 10 and floor it to convert to 8 digits. If you have it as a string, just remove the last character.
Then you can use ismember to do the work. ismember can be slow, so looking for alternative methods can be worthwhile if that is the bottleneck in your code.
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Walter Roberson
el 25 de Oct. de 2017
[tf, Bidx] = ismember(fix(A/10), B);
Now, tf(K) tells you whether A(K) had a match in B or not, and if tf(K) is true then Bidx(K) tells you which entry in B matched.
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