Highlighting Data Points in Scatter and Line Charts

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Meet our new guest author, Ian Huitson, or Hui.

Hui will share excel tutorials, implementations with us once a week. Please visit About – Hui to learn more about him.

This week I am going to introduce a method for allowing single points to be highlighted and interactively moved in Excel Scatter / X-Y Charts and Line Charts.

You will see a lot of these style charts in various places where you want to highlight various aspects of the chart to your audience. It is a great technique for complex scientific and engineering charts where you may have hundreds or thousands of points.

Introduction

Excel charting basically has 2 styles of charts with these being Y value vs X Value charts and Y value vs X Label charts.

Examples of the X Value charts are Scatter and Bubble charts. Examples of the X Label charts are Line, Column, Surface, Area, Radar and Bar charts.

The basic differences between these is that the former has a variable X Axis and the later has a fixed X-Axis spacing between subsequent data points.

Some members of the X Label charts can display a value-type X axis when the X entries are dates, ie: The X values are plotted proportionally to the dates they represent. These types include Line, Area, Column, and Bar (Thanx Jon)

Y value vs X value (Scatter Charts)

As these charts are plotting Y vs X directly onto the chart, it is simple to add a series which contains the points you want to highlight.

It is worth noting that chart series for Scatter Charts don’t have to have an equal number of entries in each series. We will use this add a new series with just one point.

Method:

Goto Pg1 of the sample file. Sample File

My Data is an X-Y set of data in B2:C41, each Y value in Column C is plotted on the chart against the corresponding X value.

To plot a single point it is a matter of adding a new data series to the chart

The new series will be the 2 cells at B43:C43

1. Setup 2 lookup cells

In B43 put the equation =OFFSET(B$1,$B$44,0)

In C43 put the equation =OFFSET(C$1,$B$44,0)

Note that both these formula retrieve  a value that is the value in the Cell Reference cell, B44, below B1 and C1 respectively.

2. Setup a Cell Reference cell

Put a value in B44 for now say 1

3.Add a new Data Series to the Chart

Right click on the chart and goto Select Data

Add a New Series

Series Name  Highlight

X Values  =’Pg1′!$B$43

Y Values  =’Pg1′!$C$43

4. Add a slider

The slider is already installed

5. Set the Sliders Cell Link, Min, Max and other details

You will now have a new data point which will be at point 1 on the chart

6. Format the New Data Series

Right Click the new point and Format Data Series

Select a larger Marker Size and make it a Bold Red to stand out

7. Add a data Label to the series

Right Click the New Series and select Add Data Labels

8. Format the Data Label

Right Click the New Series and select Format Data Labels

On the Labels Options Tab, Tick the X & Y values

Select the Label and change the Font to a Bold and Increase Size so that it stands out

Use:

As you move the slider the Highlighted point will move back and forwards across the screen and show both the location and X & Y Values of the data point.

How Does This Work?

The chart contains a second series consisting of a single point (x,y)  which has been formatted to make it stand out on the chart

The coordinates for the new point are retrieved from the My Data list by using an offset from the top of the list.

The offset retrieves its offset value from a Cell Reference cell which in turn is controlled by a slider.

Why use Offset instead of Vlookup or Index/Match?

We aren’t concerned with looking up the actual value of the highlighted point, we are interested in retrieving for example the 9th data point from the list and the the 10th or 8th as we move the slider. The Offset only cares about how far it has to go to get the value, not the value.

By doing this we can mix up the X values, as Scatter charts allow you to do, and offset will happily retrieve data in order and doesn’t care about duplicates or having sorted data. Type any values into the X Column and watch as the offset happily maintains the highlighted point.


Line Charts

As these charts are plotting Y vs the position of the value on the X-Axis, a slightly different method is employed to highlight a point of interest.

For Line Charts we will add a new series to the chart and then use a method for hiding the non-highlighted points  so that only the highlighted point is visible.

Method

Goto Pg2 of the sample file. Sample File

1. Setup a Cell Reference cell

Setup a Cell Reference cell by putting a 1 in D43

2. Add a New Data Series

Besides the sample data, add a new series Highlight

D1:  Highlight

D2: =IF(ROW()-1=$D$43,C2,NA())

Copy D2 down to D27, Don’t worry about the errors #N/A, you put them there.

3. Add a new Data Series to the Chart

Right click on the chart and goto Select Data

Add a New Series

Series Name – Highlight

Y Series =’Pg2′!$D$2:$D$27

Note there is no X Value as the Y values are plotted in order against the existing X Values

You will now have a new data point which will be at point 1 on the chart

4. Format the new Data Series

Right Click the new point and Format Data Series

Select a Bigger marker size and make it a Bold Red to stand out

5. Add Data Labels

Right Click the New Series and select Add Data Labels

Right Click the New Series and select Format Data Labels

On the Labels Options Tab, Tick the X & Y values

Select the Label and change the Font to a Bold and Increase Size so that it stands out

6. Add a slider

The slider is already installed

7. Set the Sliders Cell Link, Min, Max and other details

Use:

As you move the slider the Highlighted point will move back and forwards across the screen and show both the location and X & Y Values of the data point.

How Does This Work?

The chart contains a second series consisting of a Column of #N/A error messages and a single cell containing teh Y value for the corresponding data point

Excel ignores and doesn’t plot the cells with the error message and so only the highlighted cell is plotted

The coordinates for the new point are retrieved from the My Data list by comparing the current Row to the Cell Reference cells value and if they are the same retrieving the Y value, all others rows have an error message inserted.

The slider is connected to the Cell Reference cell and so when the slider is moved the Cell reference cell updates and the new highlighted cell retries its value.

Quick Tip #1:

You can change the highlight from a standard marker to pretty much anything you like

Insert an Icon on your worksheet, Insert Menu, Insert Icon

Format the icon as you wish, Color, Size and Copy the icon

Select the Chart and select the Highlighted data point and Paste

To apply the picture/icon to all points in a series select the series and paste

Quick Tip #2:

You can add multiple highlights using the same techniques described in this post ie: for showing Min and Max values.

Instead of linking the Cell Reference cell to a slider link it to the Minimum or Maximum value of the data: =Min(Range), =Max(range)

Checkout the example on Pg3 of the Sample File: Sample File

FUNCTIONS USED:

Offset: http://chandoo.org/wp/2008/11/19/vlookup-match-and-offset-explained-in-plain-english-spreadcheats/

Row: =Row() returns the Row number of the Current cell

=Row(M10) returns the Row Number of Cell M10 = 10

NA: = Returns the Error Message #N/A

How do you like to highlight your data? Let us all know in the comments below:

What would you like to see discussed as a How To? Let me know in the comments below:

NEXT THURSDAY: Scheduling Resources

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40 Responses to “Looking up when the data won’t co-operate (case study)”

  1. Sumit Bansal says:

    Nice Trick.. Clever use of cell references

    Here is a formula I tried to create:
    =SUMPRODUCT(((NOT(ISERROR(SEARCH(L5,B4:H14))))*1),(B5:H15))

    It takes care of Caveat #1 (can handle text), but Caveat #2 remains.

  2. PeterB says:

    In situations like this, I will often use VBA to restructure the data (2 columns: dates and values) on to a new worksheet. I can then use this 'clean' source for data analysis (formula or pivot table).

    =SUMPRODUCT(((NOT(ISERROR(SEARCH(L5,B4:H14))))*1),(B5:H15)) and complex formulae in general are all very well but when you come back to them in a few weeks / months time, it is not at all easy to see what they do and what the limitations are.

  3. Somendra Misra says:

    Hi Chandoo,

    I had used this type of cell ref. various times while calculating average.
    But for the situation here try below formula . Note this is an array formula and must be confirmed with Ctrl+Shift+Enter.

    =SMALL(IF(MMULT((L5=B4:H14)*IF(ISNUMBER(B5:H15),B5:H15),{1;1;1;1;1;1;1}),MMULT((L5=B4:H14)*IF(ISNUMBER(B5:H15),B5:H15),{1;1;1;1;1;1;1})),1)

    Regards,

  4. Somendra Misra says:

    Hi, I think Using SEARCH in here will create a problem say there is a text like SUN and another text SUNLIGHT both result will be added by SUMPRODUCT.

    Regards,

  5. Elias says:

    Array option.

    =SUM(IF(MOD(ROW(B4:B14),2)=MOD(ROW(B4),2),IF(B4:H14=L5,B5:H15)))

    Regards

    • Michael (Micky) Avidan says:

      @Elias,
      Nice approach.
      Although not requested - the formula I suggested closes all possibilities.
      Criteria: _____ Value to retrieve:
      Date__________ Numeric
      Date__________Textual
      Textual________Numeric
      Textual________Textual
      While your formula copes with only the 3 first combinations.
      Michael (Micky) Avidan
      “Microsoft® Answer” – Wiki author & Forums Moderator
      “Microsoft®” MVP – Excel (2009-2015)
      ISRAEL

      • Elias says:

        @Michael,

        Sorry but I don’t understand your point. I believe the challenge was to return the summary of a given date. What is your really volatile formula doing that mine is not?

        Regards

        • Michael (Micky) Avidan says:

          @Elias,
          I didn't say that the challenge differs from what you just mentioned/aimed to nor that your formula doesn't provide the requested result.
          Please read my previous comment again and focus on the last combination (TEXT / TEXT).
          I, myself, always try to provide a global Formula that is capable to handle all sorts of data.
          Michael (Micky) Avidan
          “Microsoft® Answer” – Wiki author & Forums Moderator
          “Microsoft®” MVP – Excel (2009-2015)
          ISRAEL

          • Elias says:

            @Michael,
            I see your point, but you are missing the below points if you are trying to cover all sorts of data.

            What happened if the lookup value does not exist?

            Do you want the first, second, summary, concatenation of the values if the look value is repeated?

            See they are too many possibilities to be cover with just one formula.

            Regards

  6. Michael (Micky) Avidan says:

    1) The range: B4:H15 was named: RNG.
    2) The following Array Formula was "retrieved from my sleeve" and I hope it can be shorten.
    3) The formula seems to take care of BOTH(!) caveats.
    -------------------------------------------------------------------------------
    =OFFSET(INDIRECT(ADDRESS(SMALL(IF(RNG=L5,ROW(RNG),""),1),MOD(SMALL(IF(RNG=L5,(ROW(RNG))+COLUMN(RNG)/10),1),1)*10)),1,)
    -------------------------------------------------------------------------------
    Michael (Micky) Avidan
    “Microsoft® Answer” – Wiki author & Forums Moderator
    “Microsoft®” MVP – Excel (2009-2015)
    ISRAEL

    • Elias says:

      @Michael,

      Check what happened with your result if you type 41927 in D5.

      Regards

      • Michael (Micky) Avidan says:

        Correct. Didn't predict that.
        Will find time to work something out.
        Michael (Micky) Avidan
        “Microsoft® Answer” – Wiki author & Forums Moderator
        “Microsoft®” MVP – Excel (2009-2015)
        ISRAEL

      • Michael (Micky) Avidan says:

        @Elias,
        Let's hope the following Array Formula "closes all open doors".
        Again - it has nothing to do with your formula which works fine as long as the 3 first mentioned combinations are concerned.
        -------------------------------------------------------------------------------
        =INDEX(RNG,LARGE(IF(RNG=L5,MOD(ROW(RNG)-1,2)*(ROW(RNG)),""),1)-2,(MOD(SMALL(IF(RNG=L5,(ROW(RNG))+COLUMN(RNG)/10),1),1)*10)-1)
        -------------------------------------------------------------------------------
        Michael (Micky) Avidan
        “Microsoft® Answer” – Wiki author & Forums Moderator
        “Microsoft®” MVP – Excel (2009-2015)
        ISRAEL

        • Elias says:

          Ok, if you insist. The following will cover all the scenarios you listed. However, I’ll never recommend/use such of formula.

          Defined names:
          rDat = $B$4:$H$15
          rRow =ROW(rDat)-MIN(ROW(rDat))+1
          rCol =COLUMN(rDat)-MIN(COLUMN(rDat))+1
          rInc =MOD(rRow,2)=MOD(MIN(rRow),2)

          L6=INDEX(rDat,MAX(IF(rInc,IF(rDat=L5,rRow)))+1,MAX(IF(rInc,IF(rDat=L5,rCol))))
          Array Enter

          Regards

        • Frank says:

          @Michael,

          unfortunately, your array formula still seems to return wrong results (eg 3-Nov).

  7. Magda says:

    If data are organized like in the example, ie. looks like a calendar, the INDEX formula seems quite simple:
    =INDEX($B$4:$H$15,ROUNDDOWN((L5-B4)/7,0)*2+2,MOD((L5-B4),7)+1)

    • Marc says:

      Yours is effectively the same as what I just came up with, and I believe this is the optimal answer to this particular problem.

      My solution, before I saw yours:
      =OFFSET(B5,QUOTIENT(L5-B4,7)*2,MOD(L5-B4,7))

      OFFSET will work for an arbitrary list size, but INDEX might be easier to read.
      QUOTIENT does the round and division in a single step.

  8. XOR LX says:

    If there's an improvement over Elias's solution then I for one can't see it.

    Perhaps a non-CSE version which would also mean that only two references (B4:H14 and B5:H15), as opposed to three (B4, B4:B14 and and B5:H15), would require manually amending should the data range change, i.e.:

    =SUMPRODUCT((ISEVEN(ROW(B4:H14)-MIN(ROW(B4:H14)))*(B4:H14=L5)*B5:H15))

    I suppose we could make it a single, uniform range reference:

    =SUMPRODUCT((ISEVEN(ROW(B4:H14)-MIN(ROW(B4:H14)))*(B4:H14=L5)*OFFSET(B4:H14,1,,,)))

    which might be more appropriate should we e.g. wish to use a Defined Name for our range, i.e.:

    =SUMPRODUCT((ISEVEN(ROW(Rng)-MIN(ROW(Rng)))*(Rng=L5)*OFFSET(Rng,1,,,)))

    though whether that compensates for the extra, volatile function call is something to be debated.

    Regards

  9. Mahir says:

    I have tried something and then my Excel workbooks got shut down. Maybe that was too much?

    Anyway here is what I've tried:

    =SUMPRODUCT(INDEX(B5:H15;IF(ISEVEN(ROW(B5:H15));ROW(B5:B15)-ROW(B5)+1);{1\2\3\4\5\6\7}))

    Guess that was wrong? Would this approach work anyway?

    Looking forward to learn something from you Excel Experts.

  10. XOR LX says:

    @Michael Avidan

    As it stands that is not a very rigorous construction.

    You say "I, myself, always try to provide a global Formula that is capable to handle all sorts of data", which is a wonderful philosophy, but isn't it at least as important that we ensure that our formulas are independent of the row and column references of the data range in question, so that, should that range change, we do not have to re-work our solution?

    What happens with your formula, for example, if RNG is instead re-located one row down, from B4:H15 to B5:H16?

    When a formula is reliant upon the addition/subtraction of certain constants within the formula, which themselves are necessarily dependent upon the specific rows/columns in which the data lies at any given time (e.g. the -1 in MOD(ROW(RNG)-1,2)), then that formula is not a very flexible one.

    Hence the reason for my choice of a slightly longer construction:

    ROW(B4:H14)-MIN(ROW(B4:H14))

    which ensures that this part of the calculation is not dependent upon the precise location of the data range within the worksheet, and so will give correct answers even if that range is re-located.

    Regards

  11. Haz says:

    {=OFFSET(B4,MAX((B4:H15=L5)*ISODD(ROW(1:12))*ROW(1:12)),MAX((B4:H15=L5)*ISODD(ROW(1:12))*COLUMN(A:G))-1)}

    • Haz says:

      Non-array formula:
      =INDEX(B4:H15,SUMPRODUCT((B4:H15=L5)*(ROW(B4:H15)-ROW(B4)+1)*ISODD(ROW(B4:H15)-ROW(B4)+1))+1,SUMPRODUCT((B4:H15=L5)*(COLUMN(B4:H15)-COLUMN(B4)+1)*ISODD(ROW(B4:H15)-ROW(B4)+1)))

      Using one range (B4:H15), one reference (B4), one lookup value (L5) and no INDIRECT or OFFSET.

  12. MF says:

    My trial with defined names:

    DateRange
    =$B$4:$H$4,$B$6:$H$6,$B$8:$H$8,$B$10:$H$10,$B$12:$H$12,$B$14:$H$14

    Position
    =RANK('lookup problem'!$L$5,DateRange,1)

    L6
    =OFFSET(B4,ROUNDUP(Position/7,0)*2- 1,IF(MOD(Position,7)=0,6,MOD(Position,7)-1))

  13. Jeff Weir says:

    I'd probably just run with something like:
    =SUMPRODUCT((B4:H14=L5)*(MOD(ROW(B4:H14),2)=MOD(ROW(B4),2))*B5:H15)
    ...which is basically the same as Elias' but without the IFs

  14. Bermir says:

    The opposite of elegant but it works...

    =INDEX(B4:H15,IFERROR(MATCH(L5,B4:B14,0),0)+IFERROR(MATCH(L5,C4:C14,0),0)+IFERROR(MATCH(L5,D4:D14,0),0)+IFERROR(MATCH(L5,E4:E14,0),0)+IFERROR(MATCH(L5,F4:F14,0),0)+IFERROR(MATCH(L5,G4:G14,0),0)+IFERROR(MATCH(L5,H4:H14,0),0)+1,IFERROR(MATCH(L5,B4:H4,0),0)+IFERROR(MATCH(L5,B6:H6,0),0)+IFERROR(MATCH(L5,B8:H8,0),0)+IFERROR(MATCH(L5,B10:H10,0),0)+IFERROR(MATCH(L5,B12:H12,0),0)+IFERROR(MATCH(L5,B14:H14,0),0))

    • Bermir says:

      =INDEX(B4:H15,
      IFERROR(MATCH(L5,B4:B14,0),0)+
      IFERROR(MATCH(L5,C4:C14,0),0)+
      IFERROR(MATCH(L5,D4:D14,0),0)+
      IFERROR(MATCH(L5,E4:E14,0),0)+
      IFERROR(MATCH(L5,F4:F14,0),0)+
      IFERROR(MATCH(L5,G4:G14,0),0)+
      IFERROR(MATCH(L5,H4:H14,0),0)+1,
      IFERROR(MATCH(L5,B4:H4,0),0)+
      IFERROR(MATCH(L5,B6:H6,0),0)+
      IFERROR(MATCH(L5,B8:H8,0),0)+
      IFERROR(MATCH(L5,B10:H10,0),0)+
      IFERROR(MATCH(L5,B12:H12,0),0)+
      IFERROR(MATCH(L5,B14:H14,0),0))

  15. HF says:

    Named Range
    rownum = SUMPRODUCT(('lookup problem'!$B$4:$H$14='lookup problem'!$L$5)*ROW('lookup problem'!$B$4:$H$14)*ISEVEN(ROW('lookup problem'!$B$4:$H$14)))

    Formula
    =OFFSET($A$1,rownum,MATCH(L5,INDIRECT("$B"&rownum&":$H"&rownum),0))

  16. Venky says:

    How about SUM(IF(B4:H14=L5,B5:H15)) with array..it should work

  17. xen says:

    Sorry, Chandoo, you can't find stuff this way in every possible scenario.
    What if 2014-10-01 sales would equal 41.927 ? Which is serial number for 2014-10-15 ? SUMIF would fail to retrive correct answer. And your example data suggest that such number is possible in your table.

    It's better not to search through dates and numbers at the same time.

    If I'd solve a problem like this, it'd reformat table first so I get one column with dates and the other with numbers.

    In this case, formula to form date column would be:
    =INDIRECT(ADDRESS((INT((ROW()-4)/COUNT($B$4:$H$4))+1)*2+2;MOD(ROW()-4;COUNT($B$4:$H$4))+2;4;1))
    and numbers would be the same formula with sight adjustment (+3 instead of +2 at the end of first argument):
    =INDIRECT(ADDRESS((INT((ROW()-4)/COUNT($B$4:$H$4))+1)*2+3;MOD(ROW()-4;COUNT($B$4:$H$4))+2;4;1))

    And now you got two columns that you can safely use for searching!

  18. xen says:

    Oops, sorry, you actually mentioned that it doesn't work if number=date! I missed that part 🙁

  19. Vad says:

    ={OFFSET(A1,SUM((B4:H14=L5)*ROW((B4:H14))),SUM((B4:H14=L5)*COLUMN((B4:H14)))-1)}

    Works for all data... the solution I got for indirect looks little lengthy

  20. Rajesh says:

    I want to count last 20 records of a person, whose marks is greater than 2 and grade "manager". ....

    Assume A1 has got names (James, John...etc...)
    A2 "Manager"

    A3 "2"

    Someone please reply

  21. Rajesh says:

    I want to count last 20 records of a person, whose marks is greater than "2" and grade "Manager"

    Assume A1 "geroge" A2 "Michael" A3 "George" etc...name can found anywhere in the rows

    B1 "Manager" B2" clerk"

    C1 "2" C2, "4"

    please reply

  22. Marc says:

    Simplest I can come up with. No limitations for either 1 or 2. This does assume dates are an ordered list with 7 per row, and 2 rows per set. Assuming this is always true this will work for an arbitrary long list of dates.

    =OFFSET(B5,QUOTIENT($L$5-$B$4,7)*2,MOD($L$5-$B$4,7))

    • Michael (Micky) Avidan says:

      @Marc,
      Nice approach - however, as there are no "Negative Dates" - try:
      =OFFSET(B5,INT(L5-B4)/7)*2,MOD(L5-B4,7))
      ——————————————————————————-
      Michael (Micky) Avidan
      “Microsoft® Answer” – Wiki author & Forums Moderator
      “Microsoft®” MVP – Excel (2009-2015)
      ISRAEL

  23. Vijaykumar Shetye says:

    =OFFSET(B4,ROUNDUP((L5-41911+1)/7,0)*2-1,MOD(L5-41911,7))

    B4 has been used as reference cell for OFFSET().

    FOR ROWS:
    ROUNDUP(....,0) gives the integer value of a division. In case of presence of a remainder, ROUNDUP will add 1 to the Quotient.
    As opposed to ROUNDUP(), the INT() or QUOTIENT() functions eliminate the remainder.

    41911 = 01-Sept-2014, the first date in the data.

    *2 has been used because there are 2 columns per set of data.

    /7 has been used because there are 7 columns per set of data.

    For columns
    MOD(L5-41911,7))

    Vijaykumar Shetye,
    Panaji, Goa, India

  24. Awais says:

    This is how i did it

    {=INDEX(B4:H15, MAX((L5=B4:H15)*ROW(B4:H15))-2, MAX((L5=B4:H15)*COLUMN(B4:H15))-1 )}

  25. Paul says:

    Here's my solution:

    =INDEX(B4:H15,MATCH(1,MMULT(--(B4:H15=L5),TRANSPOSE(COLUMN(B4:H15)^0)),0)+1,MATCH(1,MMULT(TRANSPOSE(--(B4:H15=L5)),ROW(B4:H15)^0),0))

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