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Hiding secret formulas
Kentucky Fried Chicken, Coca-Cola, etc. have secret trade formulas. Is
there a way to securely hide a secret formula? I want to create a function (macro) that when applied to a particular cell will compute a value based on variable elements of a spreadsheet as multiplied by undisclosed fixed elements. Example: Assume a1,b1, c1 and d1 have variables. Also assume that the fixed elements are fe1=.4,fe2=.25,fe3=.11,fe4=.24 stored in the function I created called rating. Thus, cell e1 =(function) rating(a1,b1,c1,d1) and yields the result of (a1*fe1)+(b1*fe2)+(c1*fe3)+(d1*4). Is there a way to hide the declaration of a function or must the function be declared in another language where it MIGHT be more secure? The use of another language would seem to raise issues like impact on speed. Is it possible to create the function and disable macros to conceal the process to all but the most knowledgeable Excel users? A newbie at writing macros, any help provided will be appreciated... |
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Hiding secret formulas
Here's one way
First select cell E1 Define a named formula, ctrl-F3 Name: myFunc RefersTo: =(A1*FE1)+(B1*FE2)+(C1*FE3)+(D1*4) in cell E1, =myFunc() check the formula is OK Now to hide it from all but mid level plus VBA'ers in the VBE, Alt-F11, open the Immediate Window, ctrl-g, paste the following activeworkbook.Names("myFunc").Visible = False with the cursor at the end of the line hit enter (back in Excel look at the names dialog ctrl-F3) Note the named formula is relative to the cell that was selected when you named it. My guess is you will want a combination of relative and absolute addresses in the named formula (that is if you want to use myFunc elsewhere) Regards, Peter T PS, when you want to see the named formula again change the False to True "HappySenior" wrote in message ... Kentucky Fried Chicken, Coca-Cola, etc. have secret trade formulas. Is there a way to securely hide a secret formula? I want to create a function (macro) that when applied to a particular cell will compute a value based on variable elements of a spreadsheet as multiplied by undisclosed fixed elements. Example: Assume a1,b1, c1 and d1 have variables. Also assume that the fixed elements are fe1=.4,fe2=.25,fe3=.11,fe4=.24 stored in the function I created called rating. Thus, cell e1 =(function) rating(a1,b1,c1,d1) and yields the result of (a1*fe1)+(b1*fe2)+(c1*fe3)+(d1*4). Is there a way to hide the declaration of a function or must the function be declared in another language where it MIGHT be more secure? The use of another language would seem to raise issues like impact on speed. Is it possible to create the function and disable macros to conceal the process to all but the most knowledgeable Excel users? A newbie at writing macros, any help provided will be appreciated... |
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