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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 ► 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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