How to automatically change the number of digits to the right of the decimal point in the fprintf function

Question

Antonio Trujillo-Ortiz 2014-9-25

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回答： Antonio Trujillo-Ortiz 2014-9-25

Hi all,

I need your help. For the ‘fprintf’ function. The corresponding part of the number of digits to the right of the decimal point (eg. %f). Can it be modified (it is changing) in a program, in accordance with certain characteristics of the information where it is needed that it fits to a specific fractional value and that obviously it would not be the same in all the cases?. Says, if in a data tenths are needed (%8.1f), for other data to ten-thousandth (%8.4f), etc. and that it fits automatically, in accordance with a criterion of operation that says the significant numbers needed.

Any hint are welcome. Thx

Antonio

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Answer 1

Sean de Wolski 2014-9-25

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You can use * as a wildcard to point at inputs:

sprintf('%*.*f', 6, 4, pi)

And in the doc for sprintf under "field width"

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Answer 2

Joseph Cheng 2014-9-25

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编辑：Joseph Cheng 2014-9-25

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If i understand your question correctly make the '%f' statement a string variable outside of the fprintf() command that us used in the fprintf or designate a significant digit variable that is referenced like below when fprintf is called.

example:

 %perform some math operation 
   sigfig = 4;
   %%some stuff going on here. 
   %later on print some value maybe performed in a function?  
   fprintf(fid,['%8.' num2str(sigfig) 'f\n\r'],X);

which then when you perform the operation you would update the specific number of significant digits in the sigfig variable which then is referenced in your fprintf statment.