Easy way to convert a String to a Float?

Hi Patrick,

one of the easiest ways to do this is to use the function cdfParseFloatString() which takes a numeric string and outputs a floating point number.

Best regards,

Lawrence.

Excellent, that works perfect for what I need. Thanks very much Lawrence. 

Hi guys,

I was about to ask a similar question relating to an earlier post i had made which was:

1) How to determine which type a variable is?

2) How to convert variable types (which i have an idea of now with the parse example from Lawrence)

Specifically my issue is that i have assigned the w&l of a transistor to variables X & Y but when i do X*Y it does not work, i assume its the format of the w&l initially OR that in assigning them to new variable names i have not specified a variable type therefore string is assumed. As if you type: 500n*2u directly into the CIW it returns a result OK.

Thanks

Stu

Stu,

The type() function will tell you the type of a variable (actually, to be precise, it tells you the type of the data pointed to by the variable, as variables do not have a type).

To produce strings, the best way is to use something like:

sprintf(nil "%g" X*Y)

For example. What you have to set the parameters of a transistor to depends on things like the type of the parameter in the CDF and/or the type of the pcell parameter (I'm not quite sure exactly what you're trying to do) - it all depends on how it has been defined.

Regards,

Andrew.

Hi Andrew,

i am trying to estimate area of layout from schematic, so for example i have assigned gate length to a variable:

cv=geGetWindowCellView(hiGetCurrentWindow())

foreach(sd_instance cv~>instances

if(sd_instance~>cellName     == "nmos_myPDK"           

then

sd_length         = sd_instance~>l

so basically i have assigned gate length to "sd_length". I just did as you suggested:

type(sd_length)

string

so i guess if i convert string to flonum (or some such number) then i can begin to multiple width x length x fingers...etc.

Thanks

Stu

 Hi Lawrence and Andrew,

I've got another question for you guys.  Similar to my original question, I have a string "3u" but I want to convert it to a float, is there a way for me to just ignore the "u" in the string?

Thanks very much,

Patrick

 Hi Stu,

Not directly related to your question, but to what you want to do.

In the "Virtuoso Preview Fundamentals Reference" documentation "installdir/doc/prfref/prfref.pdf" (in IC 5.1.41 installation tree) there is a skill procedure example that estimate the layout area from schematic. Procedure name is "areaEstSchematic" (p638) may it help you.

Regards,

Seb