Lambda that uses INDEX with array arguments behaves inconsistently when saved in the Name Manager
Hello, I have encountered what appears to be inconsistent behavior when a particular type of lambda is saved in the Name Manager. The issue seems to occurs when the LAMBDA uses INDEX with either the row_num or column_num argument supplied as an array. The following is a minimal reproducible example: The formula "=LAMBDA(arr,INDEX(arr,1,{1,2,4}))({1,2,3,4})" correctly evaluates to {1,2,4}. Now, save the lambda as TEST (or any other name) in the name manager. The formula "=TEST({1,2,3,4})" also spills the expected array {1,2,4}. However, when the result is passed to another function, the behavior changes. For example, "=SUM(TEST({1,2,3,4}))" and "=COLUMNS(TEST({1,2,3,4}))" both evaluate to 1. In contrast, using the lambda inline instead of the defined name produces the expected results: "=SUM(LAMBDA(arr,INDEX(arr,1,{1,2,4}))({1,2,3,4}))" returns 7, and "=COLUMNS(LAMBDA(arr,INDEX(arr,1,{1,2,4}))({1,2,3,4}))" returns 3. Unfortunately, I am unable to attach a workbook to this post. Additionally, the issue is not reproducible on every machine I have tested, although it is consistently reproducible in Excel for the Web. I am currently using Excel version 2607 on the Current Channel. Does this appear to be expected behavior, or is it a bug? In the meantime, what would be the best way to mitigate this issue? I have found two potential workarounds. The first is to prepend the result of the named lambda with a unary + (e.g "=SUM(+TEST({1,2,3,4}))"), which appears to force excel to treat the result as an array. However, when using a shared lambda library (as is the case for most of my team), users generally do not know the implementation details of each lambda, so it is difficult to determine when this workaround is necessary. The second approach is to avoid passing an array to the row_num or column_num argument of Index by using MAP. For example, the TEST lambda defined above can be rewritten as =LAMBDA(arr,MAP({1,2,4},LAMBDA(idx,INDEX(arr,1,idx)))), which causes it to behave as expected. However, I am concerned about potential performance implications. Intuitively I would expect that a single INDEX call with an array argument would be more efficient than multiple INDEX calls wrapped in MAP, but I do not know whether this is the case. Has anyone else encountered this behavior before?
Excel formula to get sheet name from a cell
I am trying to use a formula to reference a worksheet by getting the sheet name from a cell as shown below =IF(A34="","",MAX(Client10!C$3:C$33)) I have about 50 sheets and want to sect the sheet depending on the row. I have tried to use CONCAT to build the sheetname but cannot get it to work in the formula. All the sheets start with Client and column A contains a number which needs to be added to Client to give me the sheetname.
Is it possible to do this?
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When I try to enter a simple Python expression (like "PY 1+1" ) in Excel 365 Desktop version or Web-version, I get "#Connect!" mistake in Excel Cell. When I try to run Formulas->Python->Initialization, I get error text: "Error: We weren't able to retrieve this value. We recommend restarting the external code service environment." Simple restarting Python Environment with the help of "Reset" or "Reset Runtime" do not solve the problem. I use Windows 11, Office 365 (family). PS. I would be happy if somebody could help to solve. As for now, standard Microrsoft Suport recommended to ask for a solution in TechCommunity.Microsoft.ComExcel as a basis of construction costing of roofing
Does anyone have a sample spreadsheet that I could use for IDA hurricane damage related to removing and replacing a roof with about 4400 sq ft. The slope is 22 degrees and a hip type roof using 3 tab shingles over Titanium underlayment. The deck does not conform to Dade county standards because the 1970's construction used 2" by 6" wooden planks. New standards require 4' x 8' sheathing that is about 3/8" thick. The new sheathing is permitted to be installed over existing wood planks. See attached sample of constraints.
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