Why does sprintf('%0.7g', pi) only print out 6 decimal places?

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Lisa Lee
Lisa Lee 2017-8-12
评论： Walter Roberson 2017-8-13
I don't understand why sprintf('%0.7g', pi) only prints out 6 decimal places, since it is given a "7". Can someone please help me out here?
I tried both sprintf('%0.7f', pi) and sprintf('%0.7e', pi). Bot of them will print out 7 decimal places.

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回答（1 个）

Walter Roberson
Walter Roberson 2017-8-12
For %g format, the significant digits start from the first non-zero digit overall. The leading 3 is the first significant figure. If you sprintf('%.7g', 10*pi) you will see that as the number of digits before the decimal place increases, the digits after the decimal place decreases.
  2 个评论
Lisa Lee
Lisa Lee 2017-8-12
Are you saying that , for %e and %f, the precision number limits the decimal places, however, for %g, the precision number limits the amount of significant figures?
Walter Roberson
Walter Roberson 2017-8-13
Yes. This is documented. See https://www.mathworks.com/help/matlab/ref/sprintf.html#inputarg_formatSpec and notice the table entries talk about "digits after the decimal place" or "significant digits"

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