Google-sheets – Compound Interest Daily Google Spreadsheets

If you have row array with your values you can use this custom function to calculate the sum of the numbers (you can't use REGEXEXTRACT in the Script Editor, instead you have to use the JavaScript's RegExp function):

function sumLoop(v) {
  var sum = 0;

  for (var c = 0; c < v[0].length; c++) {
    var pattern = new RegExp("\\d+", "gi");  
    sum += parseFloat(pattern.exec(v[0][c]));
  } 

  return sum;
}​

For some reason if in the above function we'll ask for the number of rows (v.length as they mention in Google Forums), it returns an error.

So in order to see it action do the following, after copying the above function in the Script Editor:

+---+-----------+----------+----------+-----------------+
|   | A         |  B       | C        | D               |
+---+-----------+----------+----------+-----------------+
| 1 | Foo (100) | Bar (30) | Baz (50) | =sumLoop(A1:C1) |
+---+-----------+----------+----------+-----------------+

With the following Google Apps Script you can grab the LIBOR value and added it to a new sheet. Goto the script editor:

and add this script:

UPDATE 25-01-2013
I've noticed that the trigger occasionally troughs a NA#. Most probably because the GoogleFinance formula takes some time to get its info. Therefore I revised the snippet a bit, to have a sleep function added to it:

NEW

function myCustomCalculation() {
  //set active spreadsheet
  var ss = SpreadsheetApp.getActiveSpreadsheet();

  // get both the sheets 
  var sh0 = ss.getSheets()[0], sh1 = ss.getSheets()[1];

  // sleep
  Utilities.sleep(6000);

  // get cell value
  var cell = sh0.getRange("D2").getValues()[0];

  // add libor value to other sheet  
  sh1.appendRow([new Date(), cell]);
}

OLD

function myCustomCalculation() {
  //set active spreadsheet
  var ss = SpreadsheetApp.getActiveSpreadsheet();

  // flush the spreadsheet before using it  
  SpreadsheetApp.flush();

  // get both the sheets 
  var sh0 = ss.getSheets()[0], sh1 = ss.getSheets()[1];

  // get cell value from sheet[0]
  var cell = sh0.getRange("D2").getValues()[0];

  // add libor value to other sheet  
  sh1.appendRow([new Date(), cell]);
}  

The clue to the story is to create a time based trigger:

and set the trigger to execute at 5-6 pm:

See the example file I´ve created: LIBOR. I've added an extra menu item, so that you can execute the script this way.