How to ceate and key in exponential format

[ctci]

eg to key in 1.0878E-9

or 9.8767E+3

and how to define them [how to create the channel]

[AzeoTech]

I'm unclear what you mean.  You can type these numbers as constants exactly how you did.  You can format existing numbers in scientific notation using the format() function and the %e or %E specifier:

format("%E", 1.0878E-9)

would return a string:

1.087800E-009

%e does the exact same thing but puts a lower case e in response:

1.087800e-009

[ctci]

Thank you for the reply

I want to create a "Variable Value Component" and be able to

set the value with the exponential notation as in eg

1.0948E-9

0r   9.871E+3

Any documents or examples for me??\

TQVM

[AzeoTech]

So you want to be able to display in scientific notation?  Use the format() function like I showed before in the Expression in the component.

[ctci]

Yes.. The Display can show in the correct format...

Q1: But using the 'Set To' action within the  "Variable Value Component" only allows input in the format of 0.0000015,  [But I want to enter data as 1.5E-6]

Q2: I want to truncate the display from 9.123456E-9  to show only 9.1234E-9..  Please advise...

 

TQ again

 

[AzeoTech]

Q1: the set to action does allow scientific format.  It just doesn't display the current value in scientific.  That you can get around by using the system.entryDialog() function and a quick sequence instead of the Set To Action.  The code would be similar to this (assuming "x" is your variable you are setting):

private in = system.EntryDialog("Enter new value:", NULL, NULL, format("%e",x))
if (!isempty(in))
   x = in
endif

Q2: format() is basically a pass through to the old C function printf().  You can search for printf() on the web and see lots of examples of how it can be used.  In your case, you'd want: "%.4E", though I should add that it will round, so 9.123456E-9 will show up as 9.1235E-009, not 9.1234E-009