How can I get fprintf to show plus sign in front of positive numbers ?

Hi everyone, How can I get fprintf to show number with its positive sign ?

It shows only negative signs when the number is negative,

Here is the command line that I used:

fprintf('%4.2f + %4.2fX1 + %4.2fX2 + %4.2fX1^2 + %4.2fX1X2 + %4.2fX2^2 \n \n',a1 ,a2 ,a3 ,a4 ,a5 ,a6)

And here is what I got:

15.10 + 5.67X1 + -2.78X2 + 0.71X1^2 + -0.03X1X2 + -0.76X2^2

as you see, I got "+ - number" which is not meaningful.

Looking for your help.

Regards,

Mohamed Selim

[Jan]

In a mathematical sense, "a + -b" is meaningful and well-defined.

Answer 1

[Daniel Shub]

So close ... You want %+4.2f

fprintf('%+4.2f%+4.2fX1%+4.2fX2%+4.2fX1^2%+4.2fX1X2%+4.2fX2^2\n\n',a1 ,a2 ,a3 ,a4 ,a5 ,a6)

[Jan]

+1: This is exactly the job the %+d format has been created for.

[MOHAMED]

Appreciate your help,

Thanks.

Answer 2

[Azzi Abdelmalek]

s=sprintf('%4.2f + %4.2fX1 + %4.2fX2 + %4.2fX1^2 + %4.2fX1X2 + %4.2fX2^2 \n \n',a1 ,a2 ,a3 ,a4 ,a5 ,a6)
regexprep(s,'+ -','-')

[Jan]

For simple jobs, STRREP is much faster than REGEXPREP.