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I'm importing financial data into Mathematica, creating column headers for each array and exporting to Excel. The code below accomplishes most of this, but it creates a different worksheet for each array. I want to combine multiple arrays onto a single worksheet, one per column with the header at the top. Suggestions? Thanks.

spy = Prepend[FinancialData["SPY", "Jan.1,2012"], {, "SPY"}];

efa = Prepend[FinancialData["EFA", "Jan.1,2012"], {, "EFA"}];

Export["data.xls", {spy, efa}, "XLS"]
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If spy and efa have the same length, you can use Transpose:

Export["data.xls", Transpose[Join @@ Transpose /@ {spy, efa}]]

enter image description here

Update: If spy and efa have different lengths, you can use PadRight before the outermost Transpose:

d1 = FinancialData["SPY", "Jan.1,2012"];
d2 = FinancialData["EFA", "Jan.1,2012"];

spyb = Prepend[d1[[;; 10]], {, "SPY"}];
efab = Prepend[d2[[;; 20]], {, "EFA"}];

Export["data3.xls", Transpose[PadRight[Join @@ Transpose /@ {spyb, efab}, Automatic, ""]]]

enter image description here

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  • $\begingroup$ Thanks, kguler. This is a simple fix. However, there will be times when spy, efa or others will not be the same length. Any suggestions for creating the same type of format if they have different lengths? $\endgroup$ – Anthony Parish Feb 20 '15 at 2:13
  • $\begingroup$ @Anthony, please see the update for an approach to deal with different-length columns. $\endgroup$ – kglr Feb 20 '15 at 6:17

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