MATLAB: Convert large number to smaller

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I have a large array with numbers like these:
3.2692e+17
However, I want to extraxt the first three numbers, as I am interested in the 32.6 (or 32.7 if rounded). Some numbers are 3.2692e+16 for example, so dividing by e+16 is not working. What is the easiest way to do this?

Best Answer

One approach: 
f = @(x) round(x.*10.^floor(1-log10(abs(x))),2);
producing: 
x = [3.2692e+17; 3.2692e+16; 4.2516E+8];
Result = f(x)
Result =
                      3.27
                      3.27
                      4.25
Change the last argument to the round function to change the number of decimal places the function returns.
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