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

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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

Accepted Answer

Sean de Wolski
Sean de Wolski on 25 Sep 2014
You can use * as a wildcard to point at inputs:
sprintf('%*.*f', 6, 4, pi)
And in the doc for sprintf under "field width"

More Answers (2)

Joseph Cheng
Joseph Cheng on 25 Sep 2014
Edited: Joseph Cheng on 25 Sep 2014
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.
%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.

Antonio Trujillo-Ortiz
Antonio Trujillo-Ortiz on 25 Sep 2014
Thanks to Sean and Joseph. Sean answer Works fine. I did this:
d = 3; sprintf('%*.*f', 6, d, pi)


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