eldo_user

Post-Processing Library
evalExpr
evalExpr
Evaluates an expression in C-like syntax. The evalExpr command enables evaluation of an
expression written using C-like syntax. It can contain both numbers and/or waves. Quotes are
mandatory. If the expression is purely numerical a single value is returned. Otherwise the result
is a vector and is printed using the display command format (display command and output will
be described later). The PPL is able to handle complex arguments, and display them correctly.
Tip
This command is more likely to be used with numerical expressions whereas the defineVec
command is for wave calculations.
Syntax
evalExpr expression
Arguments
• expression
Expression to be evaluated.
Examples
This example demonstrates the evalExpr command. If the .tcl file contains:
proc EVAL_EXPR { wv_in } {
# evalExpr using numbers
set a 3
set numerical [evalExpr "2*$a + 4"]
puts "numerical = $numerical"
# evalExpr using waves
set vector [evalExpr "2*$wv_in + 4"]
puts "vector = $vector"
}
The following simple call to this function from the Eldo command in the .cir file:
.call_tcl tran when=END_OF_RUN EVAL_EXPR(v(1))
produces the following output:
numerical = 10.00000000000000
vector = { 0 0.00000000000000 4.00000000000000 + 0.00000000000000j }
{ 1 0.00000000002000 4.50133293425722 }
{ 2 0.00000000003900 4.97030313987119 }
{ 3 0.00000000007699 5.86034757905359 }
{ 4 0.00000000015297 7.27942102760290 }
{ 5 0.00000000022966 7.96738275669581 }
{ 6 0.00000000025000 8.00000000000000 }
{ 7 0.00000000029068 7.87006296906364 }
{ 8 0.00000000035325 7.18743864881722 }
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Eldo® User's Manual, 15.3