eldo_user

Post-Processing Library
Working with Waveforms Inside User Defined Functions
proc WAVE_PLUS { wv_in } {set wv_out [expr $wv_in + $wv_in]
+ return $wv_out}
Waveforms in Expressions
To enable operations on waveforms, a set of commands has been registered inside the PPL
environment. Table 19-3 lists common operators’ syntax and the equivalent syntax used inside
the PPL.
These commands accept real, complex and/or wave arguments. For example, it is possible to
add two waveforms, a waveform and a real, or two reals.
Two commands are available to simplify the syntax: evalExpr and defineVec.
Looking more closely at the Tcl syntax, complex expressions can be very difficult to read. For
example, in common language:
a = ((b+c)*(d+e))/(f+g)
becomes, in Tcl:
set a [div [mult [add $b $c] [add $d $e]] [add $f $g]]
The example files, expressions.cir and expressions.tcl, show the usage of the evalExpr and
defineVec commands with the two different syntaxes.
Related Topics
Table 19-3. C and PPL Syntax
C Syntax C Example PPL Syntax PPL Example
+ a = b + c add set a [add $b $c]
- a = b - c sub set a [sub $b $c]
* a = b * c mult set a [mult $b $c]
/ a = b / c div set a [div $b $c]
^ a = b ^ c pow set a [pow $b $c]
fmod a = fmod(b,c) mod set a [mod $b $c]
Post-Processing Library Example Files
evalExpr
defineVec
Making Specific Calls to User Defined Functions
Eldo® User's Manual, 15.3 1143