What types are supported by the formula node? Specifically, are any unsigned types supported?

[Gorka Larrea]

As long as i know, you can wire any numerical type to a formula node.

[Rob Cole]

The input types are set by what you wire into them. The output type defaults to Double. You must declare (Eg. "int output") to change the type of output.

[asfd]

The question isn't really what types you can hook up to the formula node, but what types you can declare within the formula node.

For example, assume you have hooked a control with type unsigned byte to the formula node labeled "x". For the output you connect an indicator with type unsigned word (16 bits). Inside you have the code:

/* formula node */
int16 y; /* defines output */

y = x;
/* end of formula code */

Let the input be 255. When the VI is run, the output will be 65535! This is because when the expression "y=x;" is executed, the byte value 255 is sign extended upon assignment to the int16 output "y".

Of course the assignment could be rewritten as:

y=x & 255;

so the output will be 255 as expected.

The problem is that this is a little
sloppy. It would be far superior if instead of defining "y" as "int16", it could be defined unsigned such as "uint16" (this doesn't work -- I tried).

The types you can declare inside a formula node (that I know of) are:

int8
int16
int32 (or int)
float32
float64 (or float)

The question is are there any other types available?

Thanks for your input

David Walker

[asfd]

I hate to be the kind of person who answers my own questions, but here I go anyway...

Unsigned types are, in fact, supported. The complete (I think) list of types that can be used in a formula node are:

int8
int16
int32 (or just 'int')
float32
float64 (or just 'float')
uInt8
uInt16
uInt32 (or just 'uInt')
floatExt

I think that's all, but if anybody knows any others, please post.