Boxing Day on the James Craig

The James Craig is a 19th Century square rigger, restored by the Sydney Heritage Fleet, which makes regular sailings from Sydney Harbour open to the public, including a Boxing Day trip to observe the departing Sydney-Hobart race:

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The crew (all volunteers) told us of the history of the vessel, including the tough life at sea of the crew of just 18, managing extreme conditions with no external communication, and no safety aids, which reminded me of:

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More on Sums

My post from last week, on using the Aggregate function to find the maximum and minimum of a range ignoring errors, was linked in the Contextures Blog’s weekly roundup, which also linked to the Contextures page of Sum Function examples.  This includes sub-totals, grand-totals, Offsets, Sumifs, Sumproducts, and much more.  It’s a comprehensive list, including clear examples and videos, and well worth a visit.

The Contextures Blog on Sums

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Sean Taylor

Another excellent UK musician I had never heard of, and judging by the number of YouTube hits, neither have you:

Someone comments that John Martyn comes to mind, so maybe this duo is not so surprising:

Sean Taylor, Wikipedia

Sean Taylor, Official Site

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Max, Min, and Aggregate

Recently I needed to find the maximum and minimum of a range of values including some #N/A values.  Searching found a variety of solutions, of which the simplest (that works in all versions) seems to be:

  • =MAX(IF(ISNUMBER(datarange),datarange))
  • =MIN(IF(ISNUMBER(datarange),datarange))

The function must be entered as an array function, i.e. type the function, then press Ctrl-Shift-Enter, rather than just Enter. The screenshot below shows a simple example:

maxmin1-1

The search also found the Aggregate function, which is new in Excel 2010, and provides a number of options for ignoring sub-totals as well as errors. The Aggregate function will return a number of different statistical functions, as well as Max and Min. These are documented with a tool=tip as the function is entered, as shown in the screen-shot below:

maxmin1-2

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ConBeamU 4.08

The continuous beam spreadsheet has had another update to fix a problem when point loads were applied to cantilevers, and the first support position was not listed as an output point.  The new version (4.08) can be downloaded from:

ConbeamU.zip

The spreadsheet results have been checked against Strand7 results for 15 different span arrangements, each with 1 of 6 different support conditions:

ConBeamU5-2

The results are summarised in the file Check conbeamU28Nov15.xlsb (included in the download zip file).  Typical results are shown below for a 3 span beam with two cantilevers, showing near exact agreement with the Strand7 results.

conbeamU5-1

Posted in Beam Bending, Excel, Finite Element Analysis, Frame Analysis, Newton, Strand7, UDFs, VBA | Tagged , , , , , , | 1 Comment