convert large number to smaller

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Lieke Numan 2019-5-10

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https://ww2.mathworks.cn/matlabcentral/answers/461342-convert-large-number-to-smaller

评论： Star Strider 2019-5-10

采纳的回答： Star Strider

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?

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KALYAN ACHARJYA 2019-5-10

编辑：KALYAN ACHARJYA 2019-5-10

Input=3.2692e+17

Disired Result=32.6

You want convert or extract?

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Star Strider 2019-5-10

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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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Lieke Numan 2019-5-10

Thanks a lot!

Star Strider 2019-5-10

As always, my pleasure!

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MATLAB Language Fundamentals Data Types Data Type Conversion

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