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limt array range to increase speed

Posted on 2011-09-12
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Last Modified: 2012-05-12
I am using the following as an array lookup and it works but the speed is killing me.

={IFERROR(INDEX(Data!F:F,MATCH($A$31&$C39,Data!A:A&Data!D:D,0)),0)}

I only need columns A-J and Rows 5 - 2000 with row 5 being the field name.  How can I adjust this lookup to get me more speed?

Thanks

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Question by:vmccune
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barry houdini earned 500 total points
ID: 36524618
Clearly you can limit the format to those rows,....perhaps also a different syntax, try

=IFERROR(INDEX(Data!F$5:F$2000,MATCH(1,IF(Data!A$5:A$2000=$A$31,IF(Data!D$5:D$2000=$C39,1)),0)),0)

confirmed with CTRL+SHIFT+ENTER

How many of these do you have?

regards, barry
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Author Comment

by:vmccune
ID: 36524647
1000 rows and about 40 columns.
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Author Comment

by:vmccune
ID: 36524693
the syntax above returne FALSE in the cell and crtl-shift-enter does not provice the right "}"


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Author Comment

by:vmccune
ID: 36524756
I got the syntax copied and it works but if I copy it down I get the same value in each row.

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Expert Comment

by:barry houdini
ID: 36524762
It's working OK for me......!

Sorry if you know.....how are you doing CTRL+SHIFT+ENTER? You need to click in the cell with the formula and then press F2 to select - then hold down CTRL and SHIFT while pressing enter.....

Is the A31 fixed for all the formulas with C39 changing as you copy down - what about the lookup ranges does col A + Col D become B and E then C and F etc.?

barry
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Author Comment

by:vmccune
ID: 36524766
forgot to recalc.  its working.  Checking speed now.
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Expert Comment

by:barry houdini
ID: 36524775
>I got the syntax copied and it works but if I copy it down I get the same value in each row

make sure calculation is set to auto....or press F9 to re-calculate.....
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Author Closing Comment

by:vmccune
ID: 36524801
Great!  Thanks.
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