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How to convert a floating point number into a string with unit prefix?

Dear all,

VerilogA knows a string format specifier %r to convert a floating point number into a string with suitable unit prefix (..., a, p, n, u, m, k, M, G, T...), such that something like

printf("Number = %r", 0.00375)

prints

"3.75m"

Is there anything alike in SKILL?

I find %g, %f and the lot, but nothing that can convert a floating point number like 0.00347 into a string with unit prefix like "3.47m".

However, this is everyday work for all the Cadence Tools, so I guess there must be at least a function that can accomplish this.

Thank you very much!

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ebecheto over 2 years ago

aelSuffixNotation(2e-5);=> "20u"

the reverse function is evalstring :

evalstring("3.14u");=> 3.14e-06

Exemple of all the units available :

(foreach mapcar x logRg(1e-15 1e+15 1.0/3) aelSuffixNotation(x))
;=> ("1f" "1p" "1n" "1u" "1m" "1" "1K" "1M" "1G" "1T")

Regards,
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ebecheto over 2 years ago

aelSuffixNotation(2e-5);=> "20u"

the reverse function is evalstring :

evalstring("3.14u");=> 3.14e-06

Exemple of all the units available :

(foreach mapcar x logRg(1e-15 1e+15 1.0/3) aelSuffixNotation(x))
;=> ("1f" "1p" "1n" "1u" "1m" "1" "1K" "1M" "1G" "1T")

Regards,
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Andrew Beckett over 2 years ago in reply to ebecheto

ebecheto said:
the reverse function is evalstring :

evalstring("3.14u");=> 3.14e-06

Sorry to be picky, but the reverse function is not evalstring, That is evaluating something as SKILL, and I wouldn't recommend this - I often give the example 'what if the string you are trying to evaluate happens to be "(exit)" or something like that?'.

The reverse function is aelNumber(). You can also use cdfParseFloatString. You can also use the SKILL parser without evaluation by using car(linereadstring(numberString))

Andrew
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Volker T over 2 years ago in reply to ebecheto

Perfect, thank you very much indeed!
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