GAMS: Undocumented PUT formats

The GAMS documentation mentions f.nr=1 (standard notation) and f.nr=2 (scientific notation) for formatting numeric items using the PUT statement. There are however a few more. Here we print values using different formats:

       f.nr=1       f.nr=2       f.nr=3       f.nr=4
         1.20     1.20E+00 1.2000000000          1.2
         1.23     1.23E+00 1.2345000000       1.2345
 123450000.00     1.23E+08 123450000.00    123450000
         0.00     1.20E-07 0.0000001200       1.2E-7
         0.00     1.23E-07 0.0000001235    1.2345E-7

It looks like formats 3 and 4 are inspired by SAS PUT formats f12.10 and best12.10.

References

1. Dictionary of formats, https://documentation.sas.com/doc/en/pgmsascdc/9.4_3.5/leforinforref/p0z62k899n6a7wn1r5in6q5253v1.htm

Appendix: GAMS code

set    i   'values'   /i1*i5/    fmt 'formats'  /'f.nr=1'*'f.nr=4'/ ; parameter p(i) 'test values' /    i1  1.2    i2  1.2345    i3  1.2345e8    i4  1.2e-7    i5  1.2345e-7 /; * * write all values in all formats * file f /put.txt/; * right align text f.lj = 1; put f; * write headers loop(fmt,    put fmt.tl:13 ); put /; * write values loop(i,    loop(fmt,       put ' ':0;       f.nr=ord(fmt);       put p(i);    );    put /; );