st: Keeping trailing zeros when formatting a decimal

[Miranda Kim <mk@mrc.soton.ac.uk>]

I would be very grateful for advice on the following basic formatting 
questions...

To store a number as a string with a format showing 2 significant 
figures, I do the following, for example:
di "`=string(-0.000029, "%9.2g")'"

If the second significant figure is a zero, how can I make sure this is 
still displayed?
The following produces:
. di "`=string(-0.0000201, "%9.2g")'"
-.00002
when I want it to display "-0.000020"

Also, how can I make sure it displays the zero before the decimal point?

Also, why does
. di "`=string(-0.000029, "%9.1g")'"
-.000029
not show only 1 significant figure?

Many thanks for your help.


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