Engineering notation without zeros

[proximous]

I'm trying to understand the difference between precision and fixed and if either can help me.

I need to display numbers where I don't know the underlying precision, so I'm just looking to display them in Engineering notation with the least zeros possible. For example:

123456780.0 -> 123.45678e6
452550000.0 -> 452.55e6
600000000.0 -> 600.0e6
9000000000.0 -> 9.0e9

Is this possible with the format command? I can't seem to find a single format command that would work for all of these cases.

[josdejong]

Thanks for bringing this up @proximous. I tried it out with your values and discovered there is a bug in format:

math.format([123456780, 45255e4, 600000000, 9000000000], {notation: 'engineering'})
// output is: [123.456780e+6, 452.550000e+6, 600e+6, 9e+9]
// should be: [123.45678e+6,  452.55e+6,     600e+6, 9e+9]  (no needless trailing zeros)

This is a bug in the number implementation of math.format, it works correctly for BigNumber:

math.format(math.bignumber([123456780, 45255e4, 600000000, 9000000000]), {notation: 'engineering'})
// output: [123.45678e+6, 452.55e+6, 600e+6, 9e+9]

The only difference with the outputs you want is no needless trailing .0. What is the reason you would like to have these trailing .0 in foor example 9.0e9? (It's in some programming languages a way to denote a floating point value instead of an integer number, but it has no mathematical meaning this way unless you would really see it as a significant digit).

[josdejong]

@proximous the issue with trailing zeros is resolved in [email protected]

[proximous]

Downloaded version 6.3.3 and it works great! Thanks! I don't need the trailing .0. That just the floating point format I'm used to seeing, but your library works great for me with this fix!

[josdejong]

Great to hear 👍