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Retrieving the evaluation result of an Initialization Cell in a notebook `nb1` from another notebook `nb2`



I have a very long code in a notebook nb1 in which all the initialization cells are tagged. I have another notebook nb2 where I want to evaluate the initialization cells in nb1 and get the results in nb2 by using CellTags.


I tried the following code, which does something but I cannot see the results in nb2.


myButton[tag_] := 
Button["Evaluate " <> tag, 
NotebookEvaluate[
"C:\\Users\\ttemel\\Desktop\\World_Bank_projects\\WB_Contract_2\\\
Extension_to_1st_contract_27oct19\\IOdatabase_oecd\\database_IOtables_\
SA_NO_UK_2000_2015_run_1.m", EvaluationElements -> {"Tags" -> {tag}}],
Method -> "Queued"];
Grid[{Map[myButton, {"SectorIOMarketChains", "DensityPlot"}]}]

CellPrint[
ExpressionCell[Defer[Print["SectorIOMarketChains"]], "Input", 
CellTags -> {"SectorIOMarketChains"}, ShowCellTags -> True]]
CellPrint[
ExpressionCell[Defer[Print["DensityPlot"]], "Input", 
CellTags -> {"DensityPlot"}, ShowCellTags -> True]]

Why does not this code give me the results in nb2?



Answer



Your file "database_IOtables _SA _NO _UK _ 2000_ 2015_run _ 1.m" isn't a Notebook, but a Package - right? Hence the EvaluationElements option is simply ignored, because Packages has no Cells and associated CellTags.



Obviously, you are trying to adapt the code from the section Examples â–º Applications on the Documentation page for NotebookEvaluate.


Here is how it is supposed to work:




  1. Create a Notebook with your cells:


    nb = CreateDocument[{
           ExpressionCell[Defer[Print["SectorIOMarketChains"]], "Input", 
            CellTags -> {"SectorIOMarketChains"}, ShowCellTags -> True],
           ExpressionCell[Defer[Print["DensityPlot"]], "Input", CellTags -> {"DensityPlot"}, 
            ShowCellTags -> True]

           }];


  2. In current Notebook create Buttons for evaluating tagged cells from that Notebook:


    myButton[nb_, tag_] := 
      Button["Evaluate " <> tag, 
       NotebookEvaluate[nb, EvaluationElements -> {"Tags" -> {tag}}], Method -> "Queued"];
    Grid[{Map[myButton[nb, #] &, {"SectorIOMarketChains", "DensityPlot"}]}]



    screenshot





  3. Sequentially press the buttons, the results will appear in current Notebook:



    screenshot






When working with an existing Notebook, on the first step you should use NotebookOpen (possibly with the option Visible -> False if you don't want it to be displayed):


nb = NotebookOpen[filePath, Visible -> False];

Do not forget to close the invisible Notebook when it is no longer needed:


NotebookClose[nb]

You can get the list of currently opened Notebooks (including invisible) via Notebooks:


Notebooks[]



Note that NotebookEvaluate is a relatively old function, introduced when CellObject wasn't available. Similar (but not exactly the same) effect can be achieved with Cells and ToExpression:


ToExpression[NotebookRead[Cells[nb, CellTags -> {"SectorIOMarketChains"}]][[1, 1]]]


SectorIOMarketChains



You can see what ToExpression returns using its three-argument form:


ToExpression[
 NotebookRead[Cells[nb, CellTags -> {"SectorIOMarketChains"}]][[1, 1]], StandardForm, Hold]



Hold[Print["SectorIOMarketChains"]]

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