Excel 2010 graph with dynamic range columns

Hi There,

I am trying to use the offset function with an indirect lookup for the first variable. (the aim being to populate a graph with a dynamic range calculated using a chosen start date and number of periods).

I have a formula that looks up the value of what needs to be in the reference variable for the OFFSET function:
="'Stat Table'!" & SUBSTITUTE(TEXT(ADDRESS(1,MATCH($Q$1,$4:$4,0),4),""),"1","") & ROW(D6)

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(so this just looks up the Letter part that is unique to the chosen date and then the number of the column the offset is for).

I then reference it in the offset like this:

=OFFSET(INDIRECT(C5),0,0,,'Stat Table'!$Q$2)

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But I get an error message of #VALUE! , any ideas? The offset value works if I just point it directly at the cell like this: =OFFSET(H3,0,0,,'Stat Table'!$Q$2) for example

Please see my problem attached
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Ingeborg Hawighorst (Microsoft MVP / EE MVE)Connect With a Mentor Microsoft MVP ExcelCommented:
I guess what's simpler comes down to preference.

I always use the long, complex formula to define the range for the X axis, then continue with Offset() to simplify the identification of the ranges for the data series.
Yes, I know that Offset() is volatile, but in a situation like this one, it's absolutely not noticeable and not worth getting my knickers in a twist, so I put readability and less typing over volatility avoidance.

Then again, with many chart series, the repeated use of the same Match() could be avoided altogether by using another named formula for the Match() portion, e.g.

firstWeek =MATCH('Stat Table'!$Q$1,'Stat Table'!$G$4:$X$4,0)
lastWeek =firstWeek+'Stat Table'!$Q$2-1

Then, if you prefer to spell out each series formula with a full fledged index, you can use something along the lines of

=INDEX('Stat Table'!$G$4:$X$4,firstWeek):INDEX('Stat Table'!$G$4:$X$4,lastWeek)

Again, this is not for speed, necessarily, but more for readability.

cheers, teylyn
Ingeborg Hawighorst (Microsoft MVP / EE MVE)Microsoft MVP ExcelCommented:

you don't need the helper cell with the cell address and you can avoid having to use Indirect() to build the range.

Set up two named ranges in the name manager:

chtXaxis      =INDEX('Stat Table'!$5:$5,MATCH('Stat Table'!$Q$1,'Stat Table'!$4:$4,0)):INDEX('Stat Table'!$5:$5,MATCH('Stat Table'!$Q$1,'Stat Table'!$4:$4,0)+'Stat Table'!$Q$2-1)
chtSeries1      =OFFSET(chtXaxis,3,0)

Then use the chtXaxis name for the X axis categories and the chtSeries1 name for the first series.

See attached.

cheers, teylyn
Patrick MatthewsCommented:
Similar approach to teylyn's, which dispenses with OFFSET as well as INDIRECT.

1) Created a sheet-scoped Name, ChartValues, with formula:

=INDEX('Stat Table'!$G$8:$X$8,1,MATCH('Stat Table'!$Q$1,'Stat Table'!$G$4:$X$4,0)):INDEX('Stat Table'!$G$8:$X$8,1,MATCH('Stat Table'!$Q$1,'Stat Table'!$G$4:$X$4,0)+'Stat Table'!$Q$2-1)

2) Created another sheet-scoped Name, ChartLabels:

=INDEX('Stat Table'!$G$4:$X$4,1,MATCH('Stat Table'!$Q$1,'Stat Table'!$G$4:$X$4,0)):INDEX('Stat Table'!$G$4:$X$4,1,MATCH('Stat Table'!$Q$1,'Stat Table'!$G$4:$X$4,0)+'Stat Table'!$Q$2-1)

3) Modified your chart to use the above Names as the source for both values and labels

4) Modified the x-axis to use a text label rather than a true date label
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