Diego Salomao

Hello Mr. Kalbermatter,

i have a question. When i type an expression like: sin(pi/2)+exp(0)+floor(1.1), i keep receiving 1.1 as an answer. Do you know the reason?

Cheers

You're library is great. I like your implementation. Thanks for sharing with us.😃

4 hours ago, Rolf Kalbermatter said:

Have you read the documentation text file included? There is a function rand() which calls the LabVIEW Random Number node and returns its values. Do not expect crypto quality randomness from this. The LabVIEW Random Number generator has been repeatedly investigated and found to have a reasonable randomness but with a limited interval. For most simple requirements that is quite enough, but if you need real crypto quality randomness there would need to be done a lot more serious work and then you quickly can forget to find this as a free library.

As to now() that's a bit tricky. The entire formula parser only really operates on doubles internally and doesn't have any other types. The newly hacked in bitwise operators were simply added by converting the double to an U64 for doing the bitwise operation then store it back as a double on the value stack. That should do for most bitwise operations for up to 32- bit integers but can start to get inaccurate if you chain many bitwise operators in a formula.

So what would you expect the now() to produces? A double representing the number of seconds since January 1, 1904 GMT, as the LabVIEW epoch is? Or rather since January 1, 1970 UTC as the Unix epoch is? Or maybe rather the number of days since January 0, 1900 as the Excel epoch, or would January 1, 1600 UTC be better as the Windows SYSTEMTIME is? You see lots of possibilities and all of them equally right or wrong, so avoiding that problem by not implementing it is simply the easiest solution. 😁

I understand. However, i have tried to run a simple expression in one of the examples of the library containing the function "rand", but an error was raised. Here´s the image attached.

Hello, 

Is it possible to add support for other simple functions like "random" or "now"?

Thanks in advance.