Quicker way than this to lookup 2 criteria ? Very slow

[JumboCactuar]

Hi,
when running this code to lookup criteria on just about 300 rows, excel hangs and this takes maybe 30 seconds

=LOOKUP(2,1/((A9=Sheet1!A:A)*($E$1=Sheet1!E:E)),Sheet1!C:C)

its to output value in Sheet1 column C where the 2 criteria match

any quicker way, sure there will be
thanks in advance

 

[cerfani]

try limiting the range you are searching to only the used range of the column and not the entire column

 

[JumboCactuar]

Thanks i will try it

Though the range is about 30000 rows, not sure if it will help

 

[cerfani]

I think you can limit the calculations with if statements...

IF(A9=Sheet1!A:A,$E$1=Sheet1!E:E)

Im not sure though, maybe that will error but the idea is to only do the caluclation for E1=Sheet1!E(x) ... if the first test is true... your way now always does every comparison. So even if the first test is false, it will still do the 2nd test for every row

But i think regardless you need to do a ton of calculations, I would be interested to see if someone comes up with an efficient way. There probably is a better way. If you do it in VBA you can structure the code in a way to minimize the calculations

 

[JumboCactuar]

I think you can limit the calculations with if statements...

IF(A9=Sheet1!A:A,$E$1=Sheet1!E:E)

Im not sure though, maybe that will error but the idea is to only do the caluclation for E1=Sheet1!E(x) ... if the first test is true... your way now always does every comparison. So even if the first test is false, it will still do the 2nd test for every row

But i think regardless you need to do a ton of calculations, I would be interested to see if someone comes up with an efficient way. There probably is a better way. If you do it in VBA you can structure the code in a way to minimize the calculations

thanks, your first suggestion is much better

now takes around 5 seconds

=LOOKUP(2,1/((A9=Sheet1!A2:A30000)*($E$1=Sheet1!E2:E30000)),Sheet1!C2:C30000)

 

[cerfani]

OK great glad you got it working.